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Michael P Carey, Ph.D.

Community ecology of fish, Food web dynamics, Anthropogenic impacts on biodiversity and ecosystem function, Invasive species

My research program seeks to better understand the role of ecological processes in shaping fish distribution and population characteristics, habitat requirements of fish, and evolutionary adaptations of aquatic organisms in response to environmental gradients. Specifically, I focus on three drivers of fish communities and populations: (1) aquatic thermal regimes, (2) Arctic landscapes dynamics, and (3) invasive species.

Currently, we lack a robust understanding of how these processes influence fish communities in high-latitude ecosystems for which information is critical to inform management and policy decisions due to a rapidly changing landscape from natural and human pressures. To understand processes that influence fish communities in Arctic and Subarctic ecosystems, my research program combines field monitoring, large-scale comparative studies, simulation modeling, and experiments at multiple spatial and temporal scales and results of these studies are used to guide conservation, protection, and management of fish and fish habitats throughout the North Pacific Rim and Alaska.

Professional Experience

  • 2012 - Present  Research Fishery Biologist, USGS, Alaska Science Center, Anchorage, Alaska

  • 2009 - 2012      Research Associate of the National Research Council, NOAA Fisheries,
                                Northwest Fisheries Science Center, Seattle, WA

  • 2003 - 2009      Research Assistant, Illinois Natural History Survey

  • 1999 - 2002      Research Assistant, Massachusetts Cooperative Fish and Wildlife Research
                                Unit USGS-BRD, University of Massachusetts, Amherst, MA

  • 1998                    Fisheries Technician, U.S. Forest Service, Payette National Forest,
                                Council, ID

  • 1996-1997        Biological Technician, Trout Lake Field Station, Northern Temperate Lakes
                               LTER, Boulder Junction, WI

  • 1996  NSF         Research experience for Undergraduates fellowship, Trout Lake Field Station,
                               North Temperate Lakes LTER, Boulder Junction, WI

Education and Certifications

  • Ph.D.  2009  University of Illinois at Urbana-Champaign Ecology, Evolution, and Conservation
                          Biology

  • M.S.   2002   University of Massachusetts-Amherst   Wildlife and Fisheries Conservation

  • B.S.   1997     University of Wisconsin-Madison   Zoology

Affiliations and Memberships*

  • American Fisheries Society

  • Ecological Society of America, Aquatic Section

Science and Products

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Orange colored water flowing into Kugororuk River, Alaska. Brown ground with vegetation, snow patches with mountains sky.

The Rusting of Arctic Rivers: Freshwater Ecosystems Respond to Rapidly Uptaking Metals

The water quality of streams and rivers in the Arctic is sensitive to rapid climate change and altered disturbance regimes.
By
Alaska Science Center
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The Rusting of Arctic Rivers: Freshwater Ecosystems Respond to Rapidly Uptaking Metals

The water quality of streams and rivers in the Arctic is sensitive to rapid climate change and altered disturbance regimes.
Learn More
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Biologist transferring a muscle biopsy from the sampler to the vial

Assessing heat stress in migrating Yukon River Chinook Salmon

We will examine evidence of heat stress in Yukon River Chinook salmon ( Oncorhynchus tshawytscha ) using heat shock proteins and gene expression.
By
Species Management Research Program, Alaska Science Center, Western Ecological Research Center (WERC)
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Assessing heat stress in migrating Yukon River Chinook Salmon

We will examine evidence of heat stress in Yukon River Chinook salmon ( Oncorhynchus tshawytscha ) using heat shock proteins and gene expression.
Learn More
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Male scientist with fishing rod and female scientist using a plankton on small boat on a lake. Green hills in background.

Tracing Mercury Through Lake Food Webs

Mercury concentrations in fish likely reflect different energy sources in lake food webs. Species, populations, or individuals may contain higher and variable concentrations of mercury, which may relate directly to prey mercury content, diets of fish, and fish foraging strategies.
By
Alaska Science Center
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Tracing Mercury Through Lake Food Webs

Mercury concentrations in fish likely reflect different energy sources in lake food webs. Species, populations, or individuals may contain higher and variable concentrations of mercury, which may relate directly to prey mercury content, diets of fish, and fish foraging strategies.
Learn More
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Spawing sockeye salmon in a Matanuska River side channel, Alaska

Fish and Aquatic Ecology

Fish and aquatic habitats in Alaska support important commercial, sport, and subsistence fisheries and provide forage fish that support wildlife populations. The USGS Alaska Science Center conducts interdisciplinary research to inform local, state, federal, and international policy makers regarding conservation of fish, aquatic species, and their habitats. We work collaboratively with hydrologists...
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Ecosystems Mission Area, Species Management Research Program, Alaska Science Center
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Fish and Aquatic Ecology

Fish and aquatic habitats in Alaska support important commercial, sport, and subsistence fisheries and provide forage fish that support wildlife populations. The USGS Alaska Science Center conducts interdisciplinary research to inform local, state, federal, and international policy makers regarding conservation of fish, aquatic species, and their habitats. We work collaboratively with hydrologists...
Learn More
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The north fork of the Agashashok River

Hydro-Ecology of Arctic Thawing (HEAT): Hydrology

The Arctic is warming at higher rates than much of the rest of the world. For Alaska, this results in changes in hydrology and ecosystems – permafrost is thawing, changing landscapes and releasing nutrients to soils and streams.
By
Land Management Research Program, Alaska Science Center
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Hydro-Ecology of Arctic Thawing (HEAT): Hydrology

The Arctic is warming at higher rates than much of the rest of the world. For Alaska, this results in changes in hydrology and ecosystems – permafrost is thawing, changing landscapes and releasing nutrients to soils and streams.
Learn More
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Yukon River near Eagle, Alaska

Q&A: Arctic Rivers Project

Alaska is home to numerous cultural and linguistic Indigenous groups and the largest number of Federally Recognized Tribes in the United States. Indigenous Alaskans, often living in rural remote communities, are facing multiple impacts due to climate change. As infrastructure, landscapes, and subsistence resources continue to be impacted by warming temperatures, the safety, well-being, and...
By
Alaska Science Center
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Q&A: Arctic Rivers Project

Alaska is home to numerous cultural and linguistic Indigenous groups and the largest number of Federally Recognized Tribes in the United States. Indigenous Alaskans, often living in rural remote communities, are facing multiple impacts due to climate change. As infrastructure, landscapes, and subsistence resources continue to be impacted by warming temperatures, the safety, well-being, and...
Learn More
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Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beavers Impacting Tundra Ecosystems (BITE)

The range expansion of the North American beaver ( Castor canadensis ) has implications for water quality, aquatic ecosystems, and fisheries in Arctic streams.
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Species Management Research Program, Alaska Science Center
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Beavers Impacting Tundra Ecosystems (BITE)

The range expansion of the North American beaver ( Castor canadensis ) has implications for water quality, aquatic ecosystems, and fisheries in Arctic streams.
Learn More
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Canning River with bars view

Winter Habitat of Juvenile Dolly Varden in the Canning River

In the Arctic, rivers often freeze all the way to the bottom each winter leaving fish with limited habitat where they can survive.
By
Alaska Science Center
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Winter Habitat of Juvenile Dolly Varden in the Canning River

In the Arctic, rivers often freeze all the way to the bottom each winter leaving fish with limited habitat where they can survive.
Learn More
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Scientist walking up the Akilik River with a minnow trap to catch fish

Hydro-Ecology of Arctic Thawing (HEAT): Ecology

Permafrost thaw is leading to a myriad of changes in physical and chemical conditions throughout the Arctic.
By
Land Management Research Program, Species Management Research Program, Alaska Science Center
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Hydro-Ecology of Arctic Thawing (HEAT): Ecology

Permafrost thaw is leading to a myriad of changes in physical and chemical conditions throughout the Arctic.
Learn More
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Elodea spp. on a rake in Sand Lake in Anchorage, Alaska

Effect of Elodea spp. on Fish Performance Mediated Through Food Web Interactions

The potential for invasive species introductions in Arctic and Subarctic ecosystems is growing as climate change manifests and human activity increases in high latitudes.
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Biological Threats and Invasive Species Research Program, Species Management Research Program, Alaska Science Center
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Effect of Elodea spp. on Fish Performance Mediated Through Food Web Interactions

The potential for invasive species introductions in Arctic and Subarctic ecosystems is growing as climate change manifests and human activity increases in high latitudes.
Learn More
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A fish weir on the Pilgrim River to prevent fish from going downstream except when controlled by a gate

Sockeye Salmon Migrating at the Northern Edge of Their Distribution

The physiological challenge for anadromous fish to migrate upriver to spawn and complete their life cycle is influenced by river temperature.
By
Alaska Science Center
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Sockeye Salmon Migrating at the Northern Edge of Their Distribution

The physiological challenge for anadromous fish to migrate upriver to spawn and complete their life cycle is influenced by river temperature.
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Filter Total Items: 15

Macroinvertebrates from Rivers in Northwest Alaska, 2015-2019

This dataset contains taxonomic information, counts, and lengths of macroinvertebrates collected from rivers in northwest Alaska using drift and kick nets during summer and fall 2015-2019.
By
Alaska Science Center

Chemistry of Orange and Reference Streams in Northwestern Alaska

These data include water chemistry from headwater streams to large rivers that have recently turned orange and reference rivers that have not. These samples were collected in two national parks in Arctic Alaska: Kobuk Valley National Park, and Noatak National Preserve.
By
Alaska Science Center

Length, Weight, Energy Density, and Isotopic Values of Fish from Rivers in Northwest Alaska, 2015-2019

This dataset contains length, weight, energy density, and isotope values of fish collected in northwest Alaskan rivers during summer and fall 2015-2019.
By
Alaska Science Center

Macroinvertebrates from Streams and Springs in the 1002 Region of the Arctic National Wildlife Refuge, Alaska, 2021

This dataset includes tables related to macroinvertebrate collections in streams and springs of the 1002 region of the Arctic National Wildlife Refuge in northeastern Alaska. Macroinvertebrates were collected using kicknets and driftnets in April and August with the goal of comparing populations to those sampled from the same water bodies by the USGS in the 1970s.
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Alaska Science Center

Limnological Data from Experimental Exposure of Juvenile Coho Salmon (Oncorhynchus kisutch) to Elodea in a High Latitude Lake

This dataset provides nine tables of data from an experimental study in which juvenile Coho Salmon (Oncorhynchus kisutch) were reared in floating net pens (limnocorrals) and exposed to Elodea spp. (a potential invasive species in high latititude lakes) and native aquatic vegetation. Data include: (1) coho salmon body, otolith, and stable isotope measurements, (2) abundance of macroinvertebrates, (
By
Alaska Science Center

Nearshore Fish Isotope Values, Beaufort Sea, Alaska, 2017-2019

This dataset contains isotope results of stable isotope (δ13C and δ15N) and radicoarbon (F14C) analyses of muscle tissue from fish collected in the nearshore Beaufort Sea, Alaska in summers 2017-2019.
By
Alaska Science Center

Stream and River Chemistry in Watersheds of Northwestern Alaska, 2015-2019

These data include stream water chemistry from headwater streams to large rivers across three national parks in Arctic Alaska: Bering Land Bridge National Preserve, Kobuk Valley National Park, and Noatak National Preserve.
By
Alaska Science Center

Stream Temperatures in the Noatak River and Kobuk River Basins, Northwest Alaska, 2017 - 2019

This data set includes 15-minute interval data on stream temperature from low-order streams and main-stem rivers in the Noatak and Kobuk River valleys in Northwestern Alaska, collected during the summer months. The water temperatures were determined using a HOBO Water Temp Pro v2 (Onset Computer Corporation, Bourne, MA, USA)with ±0.2 degrees C accuracy. Sensors were place in several locations with
By
Alaska Science Center

Continuous Records of Shallow Soil Temperature and Moisture in the Noatak River Basin, Alaska

Soil moisture and temperature were measured at four shallow depths in multiple locations within tundra and forested landscapes of the Agashashok River basin. The measurements were made continuously beginning in 2015 until the most recent download in summer, 2019 or until the sensors or loggers failed.
By
Alaska Science Center

Meteorological Data from Two Locations in the Agashashok River Watershed, Northwestern Alaska, 2015 to 2017

Meteorological data was collected from two locations in the Agashashok River Watershed, one high in the drainage located on tundra (67.5440 N, -161.6828 E) and a second on a rocky knoll near the watershed mouth (67.2821 N, -162.5841 E). The data contain information on air temperatures, rainfall, barometric pressure, relative humidity, incoming and outgoing radiation, and wind speed and direction.
By
Alaska Science Center

Physical, Hydraulic, and Thermal Properties of Soils in the Noatak River Basin, Alaska, 2016

This dataset includes physical, hydraulic, and thermal properties of soils collected in two sub-watersheds in the Noatak River Basin in northwestern Alaska. Physical properties include dry bulk density and porosity. Hydraulic properties include field- and lab-based hydraulic conductivity, soil-water retention data, and parameters used in a common soil-water retention model (van Genuchten model). T
By
Alaska Science Center

Water Level, Temperature, and Discharge of Headwater Streams in the Noatak and Kobuk River Basins, Northwest Alaska, 2015 - 2017

This data set includes 15-minute interval data on stream temperature, stage, and discharge from low-order streams in the Noatak and Kobuk River valleys in Northwestern Alaska, collected during the summer months. Several sites in the Agashashok River basin were monitored in 2015 and 2016, and additional sites were added in 2017. The depth of the water and temperature were determined using a combine
By
Alaska Science Center
Filter Total Items: 49
Kugururok River confluence showing both orange water and blue water. Shrubs along bank with mountains in background.
Kugururok River confluence Noatak National Park and Preserve, Alaska
Kugururok River confluence Noatak National Park and Preserve, Alaska
Kugururok River confluence showing both orange water and blue water. Shrubs along bank with mountains in background.

Kugururok River confluence Noatak National Park and Preserve, Alaska

Kugururok River confluence Noatak National Park and Preserve, Alaska

Mainstem of Kugururok River located in Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Kugururok River confluence showing both orange water and blue water. Shrubs along bank with mountains in background.

Kugururok River confluence Noatak National Park and Preserve, Alaska

Kugururok River confluence Noatak National Park and Preserve, Alaska

Mainstem of Kugururok River located in Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Orange water in tributary of Kugururok River. Shrubs along the bank with hills in the background.
Tributary of Kugururok River, Noatak National Park and Preserve, Alaska
Tributary of Kugururok River, Noatak National Park and Preserve, Alaska
Orange water in tributary of Kugururok River. Shrubs along the bank with hills in the background.

Tributary of Kugururok River, Noatak National Park and Preserve, Alaska

Tributary of Kugururok River, Noatak National Park and Preserve, Alaska

Tributary of Kugururok River located in Noatak National Park and Preserve, Alaska with orange water. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Orange water in tributary of Kugururok River. Shrubs along the bank with hills in the background.

Tributary of Kugururok River, Noatak National Park and Preserve, Alaska

Tributary of Kugururok River, Noatak National Park and Preserve, Alaska

Tributary of Kugururok River located in Noatak National Park and Preserve, Alaska with orange water. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Tributary of Salmon River, Alaska with orange color flowing into river. Fall vegetation and hill in the background.
Tributary of Salmon River, Alaska
Tributary of Salmon River, Alaska
Tributary of Salmon River, Alaska with orange color flowing into river. Fall vegetation and hill in the background.

Tributary of Salmon River, Alaska

Tributary of Salmon River, Alaska

Tributary of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Tributary of Salmon River, Alaska with orange color flowing into river. Fall vegetation and hill in the background.

Tributary of Salmon River, Alaska

Tributary of Salmon River, Alaska

Tributary of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Deposition on tributary of Salmon River. A dead tree lays across the water and another is on the bank next to hill.
Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska
Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska
Deposition on tributary of Salmon River. A dead tree lays across the water and another is on the bank next to hill.

Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska

Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska

Deposition on tributary of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Deposition on tributary of Salmon River. A dead tree lays across the water and another is on the bank next to hill.

Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska

Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska

Deposition on tributary of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Mainstem of Salmon River with cloudy, brownish orange water. Fall vegetation and hill surrounding riverbanks.
Mainstem of Salmon River, Kobuk Valley National Park, Alaska
Mainstem of Salmon River, Kobuk Valley National Park, Alaska
Mainstem of Salmon River with cloudy, brownish orange water. Fall vegetation and hill surrounding riverbanks.

Mainstem of Salmon River, Kobuk Valley National Park, Alaska

Mainstem of Salmon River, Kobuk Valley National Park, Alaska

Mainstem of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Mainstem of Salmon River with cloudy, brownish orange water. Fall vegetation and hill surrounding riverbanks.

Mainstem of Salmon River, Kobuk Valley National Park, Alaska

Mainstem of Salmon River, Kobuk Valley National Park, Alaska

Mainstem of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
A tributary of the Salmon River located in the Kobuk River National Park, Alaska. The tributary is orange in color.
Tributary of Salmon River, Kobuk Valley National Park, Alaska
Tributary of Salmon River, Kobuk Valley National Park, Alaska
A tributary of the Salmon River located in the Kobuk River National Park, Alaska. The tributary is orange in color.

Tributary of Salmon River, Kobuk Valley National Park, Alaska

Tributary of Salmon River, Kobuk Valley National Park, Alaska

Tributary of Salmon River located in the Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
A tributary of the Salmon River located in the Kobuk River National Park, Alaska. The tributary is orange in color.

Tributary of Salmon River, Kobuk Valley National Park, Alaska

Tributary of Salmon River, Kobuk Valley National Park, Alaska

Tributary of Salmon River located in the Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Hillside fall colors on the North fork of the Agashashok River. The foreground shows dead shrubs from iron seep.
Iron seep on the North fork of the Agashashok River
Iron seep on the North fork of the Agashashok River
Hillside fall colors on the North fork of the Agashashok River. The foreground shows dead shrubs from iron seep.

Iron seep on the North fork of the Agashashok River

Iron seep on the North fork of the Agashashok River

Iron seep on the North fork of the Agashashok River, Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Hillside fall colors on the North fork of the Agashashok River. The foreground shows dead shrubs from iron seep.

Iron seep on the North fork of the Agashashok River

Iron seep on the North fork of the Agashashok River

Iron seep on the North fork of the Agashashok River, Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Map of Arctic rivers study sites with six stars marking sites. Three aerial images with orange streams below map.
Map of orange stream observations across ARCN parks in northern Alaska
Map of orange stream observations across ARCN parks in northern Alaska
Map of Arctic rivers study sites with six stars marking sites. Three aerial images with orange streams below map.

Map of orange stream observations across ARCN parks in northern Alaska

Map of orange stream observations across ARCN parks in northern Alaska

Map of orange stream observations across Arctic Inventory and Monitoring Network (ARCN) parks in northern Alaska.

By
Alaska Science Center
Map of Arctic rivers study sites with six stars marking sites. Three aerial images with orange streams below map.

Map of orange stream observations across ARCN parks in northern Alaska

Map of orange stream observations across ARCN parks in northern Alaska

Map of orange stream observations across Arctic Inventory and Monitoring Network (ARCN) parks in northern Alaska.

By
Alaska Science Center
Hills with patches of snow and orange coloring along the bank and vegetation along the tributary of the Agashashok River, AK
Tributary of Agashashok River, Noatak National Park and Preserve, Alaska
Tributary of Agashashok River, Noatak National Park and Preserve, Alaska
Hills with patches of snow and orange coloring along the bank and vegetation along the tributary of the Agashashok River, AK

Tributary of Agashashok River, Noatak National Park and Preserve, Alaska

Tributary of Agashashok River, Noatak National Park and Preserve, Alaska

Tributary of Agashashok River located in the Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Hills with patches of snow and orange coloring along the bank and vegetation along the tributary of the Agashashok River, AK

Tributary of Agashashok River, Noatak National Park and Preserve, Alaska

Tributary of Agashashok River, Noatak National Park and Preserve, Alaska

Tributary of Agashashok River located in the Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie. AD version. Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)
Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie. AD version.

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)

Fish Ecologist Mike Carey studies the impacts beavers have on warming Alaskan permafrost landscapes.

By
Ecosystems Mission Area, Natural Hazards Mission Area
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie. AD version.

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)

Fish Ecologist Mike Carey studies the impacts beavers have on warming Alaskan permafrost landscapes.

By
Ecosystems Mission Area, Natural Hazards Mission Area
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist
Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist

Fish Ecologist Mike Carey studies the impacts beavers have on warming Alaskan permafrost landscapes.

By
Ecosystems Mission Area, Natural Hazards Mission Area
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist

Fish Ecologist Mike Carey studies the impacts beavers have on warming Alaskan permafrost landscapes.

By
Ecosystems Mission Area, Natural Hazards Mission Area
Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve
Beaver dam complex and lodge at the confluence
Beaver dam complex and lodge at the confluence
Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve

Beaver dam complex and lodge at the confluence

Beaver dam complex and lodge at the confluence

Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve

By
Alaska Science Center
Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve

Beaver dam complex and lodge at the confluence

Beaver dam complex and lodge at the confluence

Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve

By
Alaska Science Center
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

By
Alaska Science Center
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

By
Alaska Science Center
Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma) from impounded water of beaver dam on the Wrench Creek
Arctic grayling and Dolly varden from impounded water of beaver dam
Arctic grayling and Dolly varden from impounded water of beaver dam
Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma) from impounded water of beaver dam on the Wrench Creek

Arctic grayling and Dolly varden from impounded water of beaver dam

Arctic grayling and Dolly varden from impounded water of beaver dam

Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma)  from impounded water of beaver dam on the Wrench Creek, Noatak National Preserve. 

By
Alaska Science Center
Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma) from impounded water of beaver dam on the Wrench Creek

Arctic grayling and Dolly varden from impounded water of beaver dam

Arctic grayling and Dolly varden from impounded water of beaver dam

Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma)  from impounded water of beaver dam on the Wrench Creek, Noatak National Preserve. 

By
Alaska Science Center
Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve
Measuring temperature and dissolved oxygen in impounded water
Measuring temperature and dissolved oxygen in impounded water
Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve

Measuring temperature and dissolved oxygen in impounded water

Measuring temperature and dissolved oxygen in impounded water

Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve.

 

By
Alaska Science Center
Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve

Measuring temperature and dissolved oxygen in impounded water

Measuring temperature and dissolved oxygen in impounded water

Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve.

 

By
Alaska Science Center
Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve
Gnawed tree from beaver activity on tributary of the Agashashok River
Gnawed tree from beaver activity on tributary of the Agashashok River
Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve

Gnawed tree from beaver activity on tributary of the Agashashok River

Gnawed tree from beaver activity on tributary of the Agashashok River

Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve

By
Alaska Science Center
Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve

Gnawed tree from beaver activity on tributary of the Agashashok River

Gnawed tree from beaver activity on tributary of the Agashashok River

Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve

By
Alaska Science Center
Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument
Beaver dam crossing mainstem of Rabbit Creek near the headwaters
Beaver dam crossing mainstem of Rabbit Creek near the headwaters
Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument

Beaver dam crossing mainstem of Rabbit Creek near the headwaters

Beaver dam crossing mainstem of Rabbit Creek near the headwaters

Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument

Beaver dam crossing mainstem of Rabbit Creek near the headwaters

Beaver dam crossing mainstem of Rabbit Creek near the headwaters

Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument

By
Alaska Science Center
Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument.
Measuring the amount of water impounded by a beaver dam
Measuring the amount of water impounded by a beaver dam
Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument.

Measuring the amount of water impounded by a beaver dam

Measuring the amount of water impounded by a beaver dam

 

Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument. 

By
Alaska Science Center
Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument.

Measuring the amount of water impounded by a beaver dam

Measuring the amount of water impounded by a beaver dam

 

Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument. 

By
Alaska Science Center
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Filter Total Items: 27

Arctic fishes reveal patterns in radiocarbon age across habitats and with recent climate change

Climate change alters the sources and age of carbon in Arctic food webs by fostering the release of older carbon from degrading permafrost. Radiocarbon (14C) traces carbon sources and age, but data before rapid warming are rare and limit assessments over time. We capitalized on 14C data collected ~ 40 years ago that used fish as natural samplers by resampling the same species today. Among resample
Authors
Ashley E. Stanek, Jonathan A. O'Donnell, Michael P. Carey, Sarah M. Laske, Xiaomei Xu, Kenneth H. Dunton, Vanessa R. von Biela
By
Alaska Science Center

Metal mobilization from thawing permafrost to aquatic ecosystems is driving rusting of Arctic streams

Climate change in the Arctic is altering watershed hydrologic processes and biogeochemistry. Here, we present an emergent threat to Arctic watersheds based on observations from 75 streams in Alaska’s Brooks Range that recently turned orange, reflecting increased loading of iron and toxic metals. Using remote sensing, we constrain the timing of stream discoloration to the last 10 years, a period of
Authors
Jonathan A. O'Donnell, Michael P. Carey, Joshua C. Koch, Carson Baughman, Kenneth Hill, Christian E. Zimmerman, Patrick F. Sullivan, Roman J. Dial, Timothy J. Lyons, David J. Cooper, Brett A. Poulin
By
Alaska Science Center

A comparison of contemporary and historical hydrology and water quality in the foothills and coastal plain of the Arctic National Wildlife Refuge, Arctic Slope, northern Alaska

The Arctic National Wildlife Refuge is a unique landscape in northern Alaska with limited water resources, substantial biodiversity of rare and threatened species, as well as oil and gas resources. The region has unique hydrology related to perennial springs, and the formation of large aufeis fields—sheets of ice that grow in the river channels where water reaches the surface in the winter and fre
Authors
Joshua C. Koch, Heather Best, Carson Baughman, Charles Couvillion, Michael P. Carey, Jeff Conaway
By
Alaska Science Center

Differential heat shock protein responses in two species of Pacific salmon and their utility in identifying heat stress

Rapid and accelerating warming of salmon habitat has the potential to lower productivity of Pacific salmon (Oncorhynchus species) populations. Heat stress biomarkers can indicate where warming is most likely affecting fish populations; however, we often lack clear classifications that separate individuals with and without heat stress needed to make these tools operational. We conducted a heat expo
Authors
Vanessa R. von Biela, Amy M. Regish, Lizabeth Bowen, Ashley E. Stanek, Shannon C. Waters, Michael P. Carey, Christian E. Zimmerman, Jonathon Gerken, Daniel Rinella, Stephen D. McCormick
By
Ecosystems Mission Area, Eastern Ecological Science Center, Western Ecological Research Center (WERC), Alaska Science Center

Comparing sediment microbial communities of Arctic beaver ponds to tundra lakes and streams

In recent decades the habitat of North American beaver (Castor canadensis) has expanded from boreal forests into Arctic tundra ecosystems. Beaver ponds in Arctic watersheds are known to alter stream biogeochemistry, which is likely coupled with changes in the activity and composition of microbial communities inhabiting beaver pond sediments. We investigated bacterial, archaeal, and fungal communit
Authors
Kelly Shannon, Natasha R. Christman, Byron C. Crump, Michael P. Carey, Joshua C. Koch, Laura L. Lapham, Jonathan A. O'Donnell, Brett A. Poulin, Ken D. Tape, Jason A. Clark, Frederick S. Colwell
By
Alaska Science Center

Modeling, mapping, and measuring the risk of freshwater invasive species across Alaska

Freshwater ecosystems of the Alaskan Arctic and Subarctic provide resources that are culturally, ecologically, and economically invaluable. Presently, these regions are relatively free of the impacts from invasive species compared to southern latitudes. To date, there have been relatively few verified introductions of aquatic invasive species (AIS) to freshwater ecosystems in Alaska. The expanding
Authors
Marcus Geist, Catherine S. Jarnevich, Anjanette Steer, Jeanne Osnas, Michael P. Carey, Aaron C. Martin, Tammy Davis, Rachel Kelty
By
Ecosystems Mission Area, Alaska Science Center, Fort Collins Science Center

Elodea mediates juvenile salmon growth by altering physical structure in freshwater habitats

Invasive species introductions in high latitudes are accelerating and elevating the need to address questions of their effects on Subarctic and Arctic ecosystems. As a driver of ecosystem function, submerged aquatic vegetation is one of the most deleterious biological invasions to aquatic food webs. The aquatic plant Elodea spp. has potential to be a widespread invader to Arctic and Subarctic ecos
Authors
Michael P. Carey, Gordon H. Reeves, Suresh Sethi, Theresa L. Tanner, Daniel B. Young, Krista K. Bartz, Christian E. Zimmerman
By
Ecosystems Mission Area, Alaska Science Center

Investigating effects of climate-induced changes in water temperature and diet on mercury concentrations in an Arctic freshwater forage fish

The amount of mercury (Hg) in Arctic lake food webs is, and will continue to be, affected by rapid, ongoing climate change. At warmer temperatures, fish require more energy to sustain growth; changes in their metabolic rates and consuming prey with potentially higher Hg concentrations could result in increased Hg accumulation. To examine the potential implications of climate warming on forage fish
Authors
Sarah M. Laske, Samantha M. Burke, Michael P. Carey, Heidi K. Swanson, Christian E. Zimmerman
By
Alaska Science Center

How beavers are changing Arctic landscapes and Earth’s climate

Beavers build dams that change the way water moves between streams, lakes, and the land. In Alaska, beavers are moving north from the forests into the Arctic tundra. When beavers build dams in the Arctic, they cause frozen soil, called permafrost, to thaw. Scientists are studying how beavers and the thawing of permafrost are impacting streams and rivers in Alaska’s national parks. For example, per
Authors
Jonathan A. O'Donnell, Michael P. Carey, Brett Poulin, Ken Tape, Joshua C. Koch
By
Alaska Science Center

Sensitivity of headwater streamflow to thawing permafrost and vegetation change in a warming Arctic

Climate change has the potential to impact headwater streams in the Arctic by thawing permafrost and subsequently altering hydrologic regimes and vegetation distribution, physiognomy and productivity. Permafrost thaw and increased subsurface flow have been inferred from the chemistry of large rivers, but there is limited empirical evidence of the impacts to headwater streams. Here we demonstrate h
Authors
Joshua C. Koch, Ylva Sjöberg, Jonathan A. O'Donnell, Michael P. Carey, Pamela Sullivan, A. Terskaia
By
Alaska Science Center

Premature mortality observations among Alaska’s Pacific salmon during record heat and drought in 2019

Widespread mortality of Pacific salmon Oncorhynchus spp. returning to spawn in Alaska coincided with record-breaking air temperatures and prolonged drought in summer 2019. Extreme environmental conditions are expected to happen more frequently with rapid climate change and challenge the notion that Alaska could indefinitely provide abundant, cool freshwater habitat for Pacific salmon. A total of 1
Authors
Vanessa R. von Biela, Christopher J. Sergeant, Michael P. Carey, Zachary Liller, Charles M. Russell, Stephanie Quinn-Davidson, Peter S. Rand, P. A. H. Westley, Christian E. Zimmerman
By
Alaska Science Center

Multi-year, spatially extensive, watershed-scale synoptic stream chemistry and water quality conditions for six permafrost-underlain Arctic watersheds

Repeated sampling of spatially distributed river chemistry can be used to assess the location, scale, and persistence of carbon and nutrient contributions to watershed exports. Here, we provide a comprehensive set of water chemistry measurements and ecohydrological metrics describing the biogeochemical conditions of permafrost-affected Arctic watersheds. These data were collected in watershed-wide
Authors
Arial Shogren, Jay P. Zarnetske, Benjamin Abbott, Samuel P. Bratsman, Brian C. Brown, Michael P. Carey, Randy Fulweiber, Heather Greaves, Emma Haines, Frances Iannucci, Joshua C. Koch, Alex Medvedeff, Jonathan A. O'Donnell, Leika Patch, Brett Poulin, Tanner J. Williamson, William B. Bowden
By
Alaska Science Center

Non-USGS Publications**

Carey, M.P., P.S. Levin, H. Townsend, T.J. Minello, G.R. Sutton, T.B. Francis, C.J. Harvey, J.E. Toft, K. K. Arkema, J.L. Burke, C.K. Kim, A.D. Guerry, M. Plummer, G. Spiridonov, and M. Ruckelshaus. 2014. Characterizing coastal food webs with qualitative links to bridge the gap between the theory and practice of ecosystem based management. ICES Journal of Marine Science: 71 (3): 713-724. doi: 10.1093/icesjms/fst012.
Toft, J. E., J. L. Burke, M. P. Carey, C. K. Kim, G. Spiridonov, M. Marsik, D. A. Sutherland, K. K. Arkema, A. D. Guerry, P. S. Levin, T. J. Minello, M. Plummer, M. H. Ruckelshaus and H. M. Townsend. 2014. From mountains to sound: Modelling the sensitivity of Dungeness crab and Pacific oyster to land-sea interactions in Hood Canal, WA. ICES Journal of Marine Science: 71 (3): 725-738. doi: 10.1093/icesjms/fst072.
Carey, M.P., B.L. Sanderson, K.A. Barnas, and J.D. Olden. 2012. Native invaders – challenges for science, management, policy, and society. Frontiers in Ecology and the Environment. 10(7): 373–381. doi:10.1890/110060
Carey, M.P., B.L. Sanderson, T.A. Friesen, K.A. Barnas, and J.D. Olden. 2011. Smallmouth Bass in the Pacific Northwest: A Threat to Native Species, a Benefit for Anglers. Reviews in Fisheries Science 19(3): 305-315. doi:10.1080/10641262.2011.598584
Carey, M.P. and D. H. Wahl. 2011. Foraging modes of predators and behaviors of prey determine the outcome of multiple predator interactions. Transactions of the American Fisheries Society 140: 1015-1022. doi:10.1080/00028487.2011.603983
Vanlandeghem, M., M.P. Carey, and D.H. Wahl. 2011. Turbidity-induced changes in emergent effects of multiple predators with different foraging strategies. Ecology of Freshwater 20: 279–286. doi:10.1111/j.1600-0633.2011.00494.x
Carey, M.P. and D. H. Wahl. 2011. Fish diversity as a determinant of ecosystem properties across multiple trophic levels. Oikos 120: 84–94. doi:10.1111/j.1600-0706.2010.18352.x
Carey, M. P. and D. H. Wahl. 2011. Determining the mechanism by which fish diversity influences production. Oecologia 167:189-198. doi:10.1007/s00442-011-1967-3
Carey, M. P. and D. H. Wahl. 2010. Native fish diversity alters the effects of an invasive species on food webs. Ecology 91(10):2965-2974. doi:10.1890/09-1213.1
Carey, M.P., and M.E. Mather. 2008. Tracking change in a human-dominated landscape: developing conservation guidelines using freshwater fish. Aquatic Conservation: Marine and Freshwater Ecosystems 18: 877-890.
Hrabik, T.R., M. P. Carey, and M.S. Webster. 2001. Interactions between Young-of-the-Year Exotic Rainbow Smelt and Native Yellow Perch in a Northern Temperate Lake. Transactions of the American Fisheries Society. 130: 568-582. doi:10.1577/1548-8659(2001)130<0568:IBYOTY>2.0.CO;2

**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.

USGS Scientists Podcast Interviews

USGS Scientists Podcast Interviews

In 2023, USGS Alaska Science Center scientists participated in a weekly radio program and podcast called Liquid Assets, airing on KTNA 88.9 FM, a...

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Why are Arctic Rivers Turning Orange?

Why are Arctic Rivers Turning Orange?

Permafrost thaw may be contributing to discoloration of Arctic rivers by exposing iron-bearing minerals that were previously frozen and are now...

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How Elodea Affects Juvenile Salmon Growth

How Elodea Affects Juvenile Salmon Growth

The U.S. Geological Survey, U.S. National Park Service, and U.S. Forest Service are collaborating to understand the impacts of Elodea, an invasive...

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Publication Finds That Permafrost Presence Results in Warmer Headwater Streams

Publication Finds That Permafrost Presence Results in Warmer Headwater Streams

Permafrost thaw is occurring across the Arctic with potential consequences for hydrology, ecosystems, humans, and wildlife. A team of scientists from...

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Orange colored water flowing into Kugororuk River, Alaska. Brown ground with vegetation, snow patches with mountains sky.

The Rusting of Arctic Rivers: Freshwater Ecosystems Respond to Rapidly Uptaking Metals

The water quality of streams and rivers in the Arctic is sensitive to rapid climate change and altered disturbance regimes.
By
Alaska Science Center
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The Rusting of Arctic Rivers: Freshwater Ecosystems Respond to Rapidly Uptaking Metals

The water quality of streams and rivers in the Arctic is sensitive to rapid climate change and altered disturbance regimes.
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Biologist transferring a muscle biopsy from the sampler to the vial

Assessing heat stress in migrating Yukon River Chinook Salmon

We will examine evidence of heat stress in Yukon River Chinook salmon ( Oncorhynchus tshawytscha ) using heat shock proteins and gene expression.
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Species Management Research Program, Alaska Science Center, Western Ecological Research Center (WERC)
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Assessing heat stress in migrating Yukon River Chinook Salmon

We will examine evidence of heat stress in Yukon River Chinook salmon ( Oncorhynchus tshawytscha ) using heat shock proteins and gene expression.
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Male scientist with fishing rod and female scientist using a plankton on small boat on a lake. Green hills in background.

Tracing Mercury Through Lake Food Webs

Mercury concentrations in fish likely reflect different energy sources in lake food webs. Species, populations, or individuals may contain higher and variable concentrations of mercury, which may relate directly to prey mercury content, diets of fish, and fish foraging strategies.
By
Alaska Science Center
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Tracing Mercury Through Lake Food Webs

Mercury concentrations in fish likely reflect different energy sources in lake food webs. Species, populations, or individuals may contain higher and variable concentrations of mercury, which may relate directly to prey mercury content, diets of fish, and fish foraging strategies.
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Spawing sockeye salmon in a Matanuska River side channel, Alaska

Fish and Aquatic Ecology

Fish and aquatic habitats in Alaska support important commercial, sport, and subsistence fisheries and provide forage fish that support wildlife populations. The USGS Alaska Science Center conducts interdisciplinary research to inform local, state, federal, and international policy makers regarding conservation of fish, aquatic species, and their habitats. We work collaboratively with hydrologists...
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Ecosystems Mission Area, Species Management Research Program, Alaska Science Center
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Fish and Aquatic Ecology

Fish and aquatic habitats in Alaska support important commercial, sport, and subsistence fisheries and provide forage fish that support wildlife populations. The USGS Alaska Science Center conducts interdisciplinary research to inform local, state, federal, and international policy makers regarding conservation of fish, aquatic species, and their habitats. We work collaboratively with hydrologists...
Learn More
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The north fork of the Agashashok River

Hydro-Ecology of Arctic Thawing (HEAT): Hydrology

The Arctic is warming at higher rates than much of the rest of the world. For Alaska, this results in changes in hydrology and ecosystems – permafrost is thawing, changing landscapes and releasing nutrients to soils and streams.
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Land Management Research Program, Alaska Science Center
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Hydro-Ecology of Arctic Thawing (HEAT): Hydrology

The Arctic is warming at higher rates than much of the rest of the world. For Alaska, this results in changes in hydrology and ecosystems – permafrost is thawing, changing landscapes and releasing nutrients to soils and streams.
Learn More
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Yukon River near Eagle, Alaska

Q&A: Arctic Rivers Project

Alaska is home to numerous cultural and linguistic Indigenous groups and the largest number of Federally Recognized Tribes in the United States. Indigenous Alaskans, often living in rural remote communities, are facing multiple impacts due to climate change. As infrastructure, landscapes, and subsistence resources continue to be impacted by warming temperatures, the safety, well-being, and...
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Alaska Science Center
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Q&A: Arctic Rivers Project

Alaska is home to numerous cultural and linguistic Indigenous groups and the largest number of Federally Recognized Tribes in the United States. Indigenous Alaskans, often living in rural remote communities, are facing multiple impacts due to climate change. As infrastructure, landscapes, and subsistence resources continue to be impacted by warming temperatures, the safety, well-being, and...
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Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beavers Impacting Tundra Ecosystems (BITE)

The range expansion of the North American beaver ( Castor canadensis ) has implications for water quality, aquatic ecosystems, and fisheries in Arctic streams.
By
Species Management Research Program, Alaska Science Center
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Beavers Impacting Tundra Ecosystems (BITE)

The range expansion of the North American beaver ( Castor canadensis ) has implications for water quality, aquatic ecosystems, and fisheries in Arctic streams.
Learn More
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Canning River with bars view

Winter Habitat of Juvenile Dolly Varden in the Canning River

In the Arctic, rivers often freeze all the way to the bottom each winter leaving fish with limited habitat where they can survive.
By
Alaska Science Center
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Winter Habitat of Juvenile Dolly Varden in the Canning River

In the Arctic, rivers often freeze all the way to the bottom each winter leaving fish with limited habitat where they can survive.
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Scientist walking up the Akilik River with a minnow trap to catch fish

Hydro-Ecology of Arctic Thawing (HEAT): Ecology

Permafrost thaw is leading to a myriad of changes in physical and chemical conditions throughout the Arctic.
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Land Management Research Program, Species Management Research Program, Alaska Science Center
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Hydro-Ecology of Arctic Thawing (HEAT): Ecology

Permafrost thaw is leading to a myriad of changes in physical and chemical conditions throughout the Arctic.
Learn More
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Elodea spp. on a rake in Sand Lake in Anchorage, Alaska

Effect of Elodea spp. on Fish Performance Mediated Through Food Web Interactions

The potential for invasive species introductions in Arctic and Subarctic ecosystems is growing as climate change manifests and human activity increases in high latitudes.
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Biological Threats and Invasive Species Research Program, Species Management Research Program, Alaska Science Center
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Effect of Elodea spp. on Fish Performance Mediated Through Food Web Interactions

The potential for invasive species introductions in Arctic and Subarctic ecosystems is growing as climate change manifests and human activity increases in high latitudes.
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A fish weir on the Pilgrim River to prevent fish from going downstream except when controlled by a gate

Sockeye Salmon Migrating at the Northern Edge of Their Distribution

The physiological challenge for anadromous fish to migrate upriver to spawn and complete their life cycle is influenced by river temperature.
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Alaska Science Center
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Sockeye Salmon Migrating at the Northern Edge of Their Distribution

The physiological challenge for anadromous fish to migrate upriver to spawn and complete their life cycle is influenced by river temperature.
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Filter Total Items: 15

Macroinvertebrates from Rivers in Northwest Alaska, 2015-2019

This dataset contains taxonomic information, counts, and lengths of macroinvertebrates collected from rivers in northwest Alaska using drift and kick nets during summer and fall 2015-2019.
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Alaska Science Center

Chemistry of Orange and Reference Streams in Northwestern Alaska

These data include water chemistry from headwater streams to large rivers that have recently turned orange and reference rivers that have not. These samples were collected in two national parks in Arctic Alaska: Kobuk Valley National Park, and Noatak National Preserve.
By
Alaska Science Center

Length, Weight, Energy Density, and Isotopic Values of Fish from Rivers in Northwest Alaska, 2015-2019

This dataset contains length, weight, energy density, and isotope values of fish collected in northwest Alaskan rivers during summer and fall 2015-2019.
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Alaska Science Center

Macroinvertebrates from Streams and Springs in the 1002 Region of the Arctic National Wildlife Refuge, Alaska, 2021

This dataset includes tables related to macroinvertebrate collections in streams and springs of the 1002 region of the Arctic National Wildlife Refuge in northeastern Alaska. Macroinvertebrates were collected using kicknets and driftnets in April and August with the goal of comparing populations to those sampled from the same water bodies by the USGS in the 1970s.
By
Alaska Science Center

Limnological Data from Experimental Exposure of Juvenile Coho Salmon (Oncorhynchus kisutch) to Elodea in a High Latitude Lake

This dataset provides nine tables of data from an experimental study in which juvenile Coho Salmon (Oncorhynchus kisutch) were reared in floating net pens (limnocorrals) and exposed to Elodea spp. (a potential invasive species in high latititude lakes) and native aquatic vegetation. Data include: (1) coho salmon body, otolith, and stable isotope measurements, (2) abundance of macroinvertebrates, (
By
Alaska Science Center

Nearshore Fish Isotope Values, Beaufort Sea, Alaska, 2017-2019

This dataset contains isotope results of stable isotope (δ13C and δ15N) and radicoarbon (F14C) analyses of muscle tissue from fish collected in the nearshore Beaufort Sea, Alaska in summers 2017-2019.
By
Alaska Science Center

Stream and River Chemistry in Watersheds of Northwestern Alaska, 2015-2019

These data include stream water chemistry from headwater streams to large rivers across three national parks in Arctic Alaska: Bering Land Bridge National Preserve, Kobuk Valley National Park, and Noatak National Preserve.
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Alaska Science Center

Stream Temperatures in the Noatak River and Kobuk River Basins, Northwest Alaska, 2017 - 2019

This data set includes 15-minute interval data on stream temperature from low-order streams and main-stem rivers in the Noatak and Kobuk River valleys in Northwestern Alaska, collected during the summer months. The water temperatures were determined using a HOBO Water Temp Pro v2 (Onset Computer Corporation, Bourne, MA, USA)with ±0.2 degrees C accuracy. Sensors were place in several locations with
By
Alaska Science Center

Continuous Records of Shallow Soil Temperature and Moisture in the Noatak River Basin, Alaska

Soil moisture and temperature were measured at four shallow depths in multiple locations within tundra and forested landscapes of the Agashashok River basin. The measurements were made continuously beginning in 2015 until the most recent download in summer, 2019 or until the sensors or loggers failed.
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Alaska Science Center

Meteorological Data from Two Locations in the Agashashok River Watershed, Northwestern Alaska, 2015 to 2017

Meteorological data was collected from two locations in the Agashashok River Watershed, one high in the drainage located on tundra (67.5440 N, -161.6828 E) and a second on a rocky knoll near the watershed mouth (67.2821 N, -162.5841 E). The data contain information on air temperatures, rainfall, barometric pressure, relative humidity, incoming and outgoing radiation, and wind speed and direction.
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Alaska Science Center

Physical, Hydraulic, and Thermal Properties of Soils in the Noatak River Basin, Alaska, 2016

This dataset includes physical, hydraulic, and thermal properties of soils collected in two sub-watersheds in the Noatak River Basin in northwestern Alaska. Physical properties include dry bulk density and porosity. Hydraulic properties include field- and lab-based hydraulic conductivity, soil-water retention data, and parameters used in a common soil-water retention model (van Genuchten model). T
By
Alaska Science Center

Water Level, Temperature, and Discharge of Headwater Streams in the Noatak and Kobuk River Basins, Northwest Alaska, 2015 - 2017

This data set includes 15-minute interval data on stream temperature, stage, and discharge from low-order streams in the Noatak and Kobuk River valleys in Northwestern Alaska, collected during the summer months. Several sites in the Agashashok River basin were monitored in 2015 and 2016, and additional sites were added in 2017. The depth of the water and temperature were determined using a combine
By
Alaska Science Center
Filter Total Items: 49
Kugururok River confluence showing both orange water and blue water. Shrubs along bank with mountains in background.
Kugururok River confluence Noatak National Park and Preserve, Alaska
Kugururok River confluence Noatak National Park and Preserve, Alaska
Kugururok River confluence showing both orange water and blue water. Shrubs along bank with mountains in background.

Kugururok River confluence Noatak National Park and Preserve, Alaska

Kugururok River confluence Noatak National Park and Preserve, Alaska

Mainstem of Kugururok River located in Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Kugururok River confluence showing both orange water and blue water. Shrubs along bank with mountains in background.

Kugururok River confluence Noatak National Park and Preserve, Alaska

Kugururok River confluence Noatak National Park and Preserve, Alaska

Mainstem of Kugururok River located in Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Orange water in tributary of Kugururok River. Shrubs along the bank with hills in the background.
Tributary of Kugururok River, Noatak National Park and Preserve, Alaska
Tributary of Kugururok River, Noatak National Park and Preserve, Alaska
Orange water in tributary of Kugururok River. Shrubs along the bank with hills in the background.

Tributary of Kugururok River, Noatak National Park and Preserve, Alaska

Tributary of Kugururok River, Noatak National Park and Preserve, Alaska

Tributary of Kugururok River located in Noatak National Park and Preserve, Alaska with orange water. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Orange water in tributary of Kugururok River. Shrubs along the bank with hills in the background.

Tributary of Kugururok River, Noatak National Park and Preserve, Alaska

Tributary of Kugururok River, Noatak National Park and Preserve, Alaska

Tributary of Kugururok River located in Noatak National Park and Preserve, Alaska with orange water. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Tributary of Salmon River, Alaska with orange color flowing into river. Fall vegetation and hill in the background.
Tributary of Salmon River, Alaska
Tributary of Salmon River, Alaska
Tributary of Salmon River, Alaska with orange color flowing into river. Fall vegetation and hill in the background.

Tributary of Salmon River, Alaska

Tributary of Salmon River, Alaska

Tributary of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Tributary of Salmon River, Alaska with orange color flowing into river. Fall vegetation and hill in the background.

Tributary of Salmon River, Alaska

Tributary of Salmon River, Alaska

Tributary of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Deposition on tributary of Salmon River. A dead tree lays across the water and another is on the bank next to hill.
Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska
Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska
Deposition on tributary of Salmon River. A dead tree lays across the water and another is on the bank next to hill.

Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska

Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska

Deposition on tributary of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Deposition on tributary of Salmon River. A dead tree lays across the water and another is on the bank next to hill.

Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska

Deposition on tributary of Salmon River, Kobuk Valley National Park, Alaska

Deposition on tributary of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Mainstem of Salmon River with cloudy, brownish orange water. Fall vegetation and hill surrounding riverbanks.
Mainstem of Salmon River, Kobuk Valley National Park, Alaska
Mainstem of Salmon River, Kobuk Valley National Park, Alaska
Mainstem of Salmon River with cloudy, brownish orange water. Fall vegetation and hill surrounding riverbanks.

Mainstem of Salmon River, Kobuk Valley National Park, Alaska

Mainstem of Salmon River, Kobuk Valley National Park, Alaska

Mainstem of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Mainstem of Salmon River with cloudy, brownish orange water. Fall vegetation and hill surrounding riverbanks.

Mainstem of Salmon River, Kobuk Valley National Park, Alaska

Mainstem of Salmon River, Kobuk Valley National Park, Alaska

Mainstem of Salmon River located in Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
A tributary of the Salmon River located in the Kobuk River National Park, Alaska. The tributary is orange in color.
Tributary of Salmon River, Kobuk Valley National Park, Alaska
Tributary of Salmon River, Kobuk Valley National Park, Alaska
A tributary of the Salmon River located in the Kobuk River National Park, Alaska. The tributary is orange in color.

Tributary of Salmon River, Kobuk Valley National Park, Alaska

Tributary of Salmon River, Kobuk Valley National Park, Alaska

Tributary of Salmon River located in the Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
A tributary of the Salmon River located in the Kobuk River National Park, Alaska. The tributary is orange in color.

Tributary of Salmon River, Kobuk Valley National Park, Alaska

Tributary of Salmon River, Kobuk Valley National Park, Alaska

Tributary of Salmon River located in the Kobuk Valley National Park, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Hillside fall colors on the North fork of the Agashashok River. The foreground shows dead shrubs from iron seep.
Iron seep on the North fork of the Agashashok River
Iron seep on the North fork of the Agashashok River
Hillside fall colors on the North fork of the Agashashok River. The foreground shows dead shrubs from iron seep.

Iron seep on the North fork of the Agashashok River

Iron seep on the North fork of the Agashashok River

Iron seep on the North fork of the Agashashok River, Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Hillside fall colors on the North fork of the Agashashok River. The foreground shows dead shrubs from iron seep.

Iron seep on the North fork of the Agashashok River

Iron seep on the North fork of the Agashashok River

Iron seep on the North fork of the Agashashok River, Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center, Alaska Science Center
Map of Arctic rivers study sites with six stars marking sites. Three aerial images with orange streams below map.
Map of orange stream observations across ARCN parks in northern Alaska
Map of orange stream observations across ARCN parks in northern Alaska
Map of Arctic rivers study sites with six stars marking sites. Three aerial images with orange streams below map.

Map of orange stream observations across ARCN parks in northern Alaska

Map of orange stream observations across ARCN parks in northern Alaska

Map of orange stream observations across Arctic Inventory and Monitoring Network (ARCN) parks in northern Alaska.

By
Alaska Science Center
Map of Arctic rivers study sites with six stars marking sites. Three aerial images with orange streams below map.

Map of orange stream observations across ARCN parks in northern Alaska

Map of orange stream observations across ARCN parks in northern Alaska

Map of orange stream observations across Arctic Inventory and Monitoring Network (ARCN) parks in northern Alaska.

By
Alaska Science Center
Hills with patches of snow and orange coloring along the bank and vegetation along the tributary of the Agashashok River, AK
Tributary of Agashashok River, Noatak National Park and Preserve, Alaska
Tributary of Agashashok River, Noatak National Park and Preserve, Alaska
Hills with patches of snow and orange coloring along the bank and vegetation along the tributary of the Agashashok River, AK

Tributary of Agashashok River, Noatak National Park and Preserve, Alaska

Tributary of Agashashok River, Noatak National Park and Preserve, Alaska

Tributary of Agashashok River located in the Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Hills with patches of snow and orange coloring along the bank and vegetation along the tributary of the Agashashok River, AK

Tributary of Agashashok River, Noatak National Park and Preserve, Alaska

Tributary of Agashashok River, Noatak National Park and Preserve, Alaska

Tributary of Agashashok River located in the Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw.

By
Alaska Science Center
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie. AD version. Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)
Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie. AD version.

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)

Fish Ecologist Mike Carey studies the impacts beavers have on warming Alaskan permafrost landscapes.

By
Ecosystems Mission Area, Natural Hazards Mission Area
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie. AD version.

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist (AD)

Fish Ecologist Mike Carey studies the impacts beavers have on warming Alaskan permafrost landscapes.

By
Ecosystems Mission Area, Natural Hazards Mission Area
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist
Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist

Fish Ecologist Mike Carey studies the impacts beavers have on warming Alaskan permafrost landscapes.

By
Ecosystems Mission Area, Natural Hazards Mission Area
Misty pine trees overlaid with photo of smiling white man in a red and white striped beanie

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist

Climate Science Champions, Season 1: Mike Carey, Research Fish Ecologist

Fish Ecologist Mike Carey studies the impacts beavers have on warming Alaskan permafrost landscapes.

By
Ecosystems Mission Area, Natural Hazards Mission Area
Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve
Beaver dam complex and lodge at the confluence
Beaver dam complex and lodge at the confluence
Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve

Beaver dam complex and lodge at the confluence

Beaver dam complex and lodge at the confluence

Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve

By
Alaska Science Center
Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve

Beaver dam complex and lodge at the confluence

Beaver dam complex and lodge at the confluence

Beaver dam complex and lodge at the confluence of Wrench Creek and Kelly River, Noatak National Preserve

By
Alaska Science Center
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

By
Alaska Science Center
Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

Beaver dam and lodge on the Wrench Creek, Noatak National Preserve

By
Alaska Science Center
Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma) from impounded water of beaver dam on the Wrench Creek
Arctic grayling and Dolly varden from impounded water of beaver dam
Arctic grayling and Dolly varden from impounded water of beaver dam
Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma) from impounded water of beaver dam on the Wrench Creek

Arctic grayling and Dolly varden from impounded water of beaver dam

Arctic grayling and Dolly varden from impounded water of beaver dam

Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma)  from impounded water of beaver dam on the Wrench Creek, Noatak National Preserve. 

By
Alaska Science Center
Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma) from impounded water of beaver dam on the Wrench Creek

Arctic grayling and Dolly varden from impounded water of beaver dam

Arctic grayling and Dolly varden from impounded water of beaver dam

Arctic grayling (Thymallus arcticus) and Dolly varden (Salvelinus malma)  from impounded water of beaver dam on the Wrench Creek, Noatak National Preserve. 

By
Alaska Science Center
Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve
Measuring temperature and dissolved oxygen in impounded water
Measuring temperature and dissolved oxygen in impounded water
Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve

Measuring temperature and dissolved oxygen in impounded water

Measuring temperature and dissolved oxygen in impounded water

Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve.

 

By
Alaska Science Center
Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve

Measuring temperature and dissolved oxygen in impounded water

Measuring temperature and dissolved oxygen in impounded water

Measuring temperature and dissolved oxygen in impounded water of beaver dam on the Wrench Creek, Noatak National Preserve.

 

By
Alaska Science Center
Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve
Gnawed tree from beaver activity on tributary of the Agashashok River
Gnawed tree from beaver activity on tributary of the Agashashok River
Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve

Gnawed tree from beaver activity on tributary of the Agashashok River

Gnawed tree from beaver activity on tributary of the Agashashok River

Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve

By
Alaska Science Center
Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve

Gnawed tree from beaver activity on tributary of the Agashashok River

Gnawed tree from beaver activity on tributary of the Agashashok River

Gnawed tree from beaver activity on tributary of the Agashashok River, Noatak National Preserve

By
Alaska Science Center
Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument
Beaver dam crossing mainstem of Rabbit Creek near the headwaters
Beaver dam crossing mainstem of Rabbit Creek near the headwaters
Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument

Beaver dam crossing mainstem of Rabbit Creek near the headwaters

Beaver dam crossing mainstem of Rabbit Creek near the headwaters

Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument

Beaver dam crossing mainstem of Rabbit Creek near the headwaters

Beaver dam crossing mainstem of Rabbit Creek near the headwaters

Beaver dam crossing mainstem of Rabbit Creek near the headwaters, Cape Krusenstern National Monument

By
Alaska Science Center
Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument.
Measuring the amount of water impounded by a beaver dam
Measuring the amount of water impounded by a beaver dam
Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument.

Measuring the amount of water impounded by a beaver dam

Measuring the amount of water impounded by a beaver dam

 

Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument. 

By
Alaska Science Center
Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument.

Measuring the amount of water impounded by a beaver dam

Measuring the amount of water impounded by a beaver dam

 

Measuring the amount of water impounded by a beaver dam on Rabbit Creek, Cape Krusenstern National Monument. 

By
Alaska Science Center
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern

Beaver swimming near dam on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

Beaver dams on Rabbit Creek, Cape Krusenstern National Monument

By
Alaska Science Center
Filter Total Items: 27

Arctic fishes reveal patterns in radiocarbon age across habitats and with recent climate change

Climate change alters the sources and age of carbon in Arctic food webs by fostering the release of older carbon from degrading permafrost. Radiocarbon (14C) traces carbon sources and age, but data before rapid warming are rare and limit assessments over time. We capitalized on 14C data collected ~ 40 years ago that used fish as natural samplers by resampling the same species today. Among resample
Authors
Ashley E. Stanek, Jonathan A. O'Donnell, Michael P. Carey, Sarah M. Laske, Xiaomei Xu, Kenneth H. Dunton, Vanessa R. von Biela
By
Alaska Science Center

Metal mobilization from thawing permafrost to aquatic ecosystems is driving rusting of Arctic streams

Climate change in the Arctic is altering watershed hydrologic processes and biogeochemistry. Here, we present an emergent threat to Arctic watersheds based on observations from 75 streams in Alaska’s Brooks Range that recently turned orange, reflecting increased loading of iron and toxic metals. Using remote sensing, we constrain the timing of stream discoloration to the last 10 years, a period of
Authors
Jonathan A. O'Donnell, Michael P. Carey, Joshua C. Koch, Carson Baughman, Kenneth Hill, Christian E. Zimmerman, Patrick F. Sullivan, Roman J. Dial, Timothy J. Lyons, David J. Cooper, Brett A. Poulin
By
Alaska Science Center

A comparison of contemporary and historical hydrology and water quality in the foothills and coastal plain of the Arctic National Wildlife Refuge, Arctic Slope, northern Alaska

The Arctic National Wildlife Refuge is a unique landscape in northern Alaska with limited water resources, substantial biodiversity of rare and threatened species, as well as oil and gas resources. The region has unique hydrology related to perennial springs, and the formation of large aufeis fields—sheets of ice that grow in the river channels where water reaches the surface in the winter and fre
Authors
Joshua C. Koch, Heather Best, Carson Baughman, Charles Couvillion, Michael P. Carey, Jeff Conaway
By
Alaska Science Center

Differential heat shock protein responses in two species of Pacific salmon and their utility in identifying heat stress

Rapid and accelerating warming of salmon habitat has the potential to lower productivity of Pacific salmon (Oncorhynchus species) populations. Heat stress biomarkers can indicate where warming is most likely affecting fish populations; however, we often lack clear classifications that separate individuals with and without heat stress needed to make these tools operational. We conducted a heat expo
Authors
Vanessa R. von Biela, Amy M. Regish, Lizabeth Bowen, Ashley E. Stanek, Shannon C. Waters, Michael P. Carey, Christian E. Zimmerman, Jonathon Gerken, Daniel Rinella, Stephen D. McCormick
By
Ecosystems Mission Area, Eastern Ecological Science Center, Western Ecological Research Center (WERC), Alaska Science Center

Comparing sediment microbial communities of Arctic beaver ponds to tundra lakes and streams

In recent decades the habitat of North American beaver (Castor canadensis) has expanded from boreal forests into Arctic tundra ecosystems. Beaver ponds in Arctic watersheds are known to alter stream biogeochemistry, which is likely coupled with changes in the activity and composition of microbial communities inhabiting beaver pond sediments. We investigated bacterial, archaeal, and fungal communit
Authors
Kelly Shannon, Natasha R. Christman, Byron C. Crump, Michael P. Carey, Joshua C. Koch, Laura L. Lapham, Jonathan A. O'Donnell, Brett A. Poulin, Ken D. Tape, Jason A. Clark, Frederick S. Colwell
By
Alaska Science Center

Modeling, mapping, and measuring the risk of freshwater invasive species across Alaska

Freshwater ecosystems of the Alaskan Arctic and Subarctic provide resources that are culturally, ecologically, and economically invaluable. Presently, these regions are relatively free of the impacts from invasive species compared to southern latitudes. To date, there have been relatively few verified introductions of aquatic invasive species (AIS) to freshwater ecosystems in Alaska. The expanding
Authors
Marcus Geist, Catherine S. Jarnevich, Anjanette Steer, Jeanne Osnas, Michael P. Carey, Aaron C. Martin, Tammy Davis, Rachel Kelty
By
Ecosystems Mission Area, Alaska Science Center, Fort Collins Science Center

Elodea mediates juvenile salmon growth by altering physical structure in freshwater habitats

Invasive species introductions in high latitudes are accelerating and elevating the need to address questions of their effects on Subarctic and Arctic ecosystems. As a driver of ecosystem function, submerged aquatic vegetation is one of the most deleterious biological invasions to aquatic food webs. The aquatic plant Elodea spp. has potential to be a widespread invader to Arctic and Subarctic ecos
Authors
Michael P. Carey, Gordon H. Reeves, Suresh Sethi, Theresa L. Tanner, Daniel B. Young, Krista K. Bartz, Christian E. Zimmerman
By
Ecosystems Mission Area, Alaska Science Center

Investigating effects of climate-induced changes in water temperature and diet on mercury concentrations in an Arctic freshwater forage fish

The amount of mercury (Hg) in Arctic lake food webs is, and will continue to be, affected by rapid, ongoing climate change. At warmer temperatures, fish require more energy to sustain growth; changes in their metabolic rates and consuming prey with potentially higher Hg concentrations could result in increased Hg accumulation. To examine the potential implications of climate warming on forage fish
Authors
Sarah M. Laske, Samantha M. Burke, Michael P. Carey, Heidi K. Swanson, Christian E. Zimmerman
By
Alaska Science Center

How beavers are changing Arctic landscapes and Earth’s climate

Beavers build dams that change the way water moves between streams, lakes, and the land. In Alaska, beavers are moving north from the forests into the Arctic tundra. When beavers build dams in the Arctic, they cause frozen soil, called permafrost, to thaw. Scientists are studying how beavers and the thawing of permafrost are impacting streams and rivers in Alaska’s national parks. For example, per
Authors
Jonathan A. O'Donnell, Michael P. Carey, Brett Poulin, Ken Tape, Joshua C. Koch
By
Alaska Science Center

Sensitivity of headwater streamflow to thawing permafrost and vegetation change in a warming Arctic

Climate change has the potential to impact headwater streams in the Arctic by thawing permafrost and subsequently altering hydrologic regimes and vegetation distribution, physiognomy and productivity. Permafrost thaw and increased subsurface flow have been inferred from the chemistry of large rivers, but there is limited empirical evidence of the impacts to headwater streams. Here we demonstrate h
Authors
Joshua C. Koch, Ylva Sjöberg, Jonathan A. O'Donnell, Michael P. Carey, Pamela Sullivan, A. Terskaia
By
Alaska Science Center

Premature mortality observations among Alaska’s Pacific salmon during record heat and drought in 2019

Widespread mortality of Pacific salmon Oncorhynchus spp. returning to spawn in Alaska coincided with record-breaking air temperatures and prolonged drought in summer 2019. Extreme environmental conditions are expected to happen more frequently with rapid climate change and challenge the notion that Alaska could indefinitely provide abundant, cool freshwater habitat for Pacific salmon. A total of 1
Authors
Vanessa R. von Biela, Christopher J. Sergeant, Michael P. Carey, Zachary Liller, Charles M. Russell, Stephanie Quinn-Davidson, Peter S. Rand, P. A. H. Westley, Christian E. Zimmerman
By
Alaska Science Center

Multi-year, spatially extensive, watershed-scale synoptic stream chemistry and water quality conditions for six permafrost-underlain Arctic watersheds

Repeated sampling of spatially distributed river chemistry can be used to assess the location, scale, and persistence of carbon and nutrient contributions to watershed exports. Here, we provide a comprehensive set of water chemistry measurements and ecohydrological metrics describing the biogeochemical conditions of permafrost-affected Arctic watersheds. These data were collected in watershed-wide
Authors
Arial Shogren, Jay P. Zarnetske, Benjamin Abbott, Samuel P. Bratsman, Brian C. Brown, Michael P. Carey, Randy Fulweiber, Heather Greaves, Emma Haines, Frances Iannucci, Joshua C. Koch, Alex Medvedeff, Jonathan A. O'Donnell, Leika Patch, Brett Poulin, Tanner J. Williamson, William B. Bowden
By
Alaska Science Center

Non-USGS Publications**

Carey, M.P., P.S. Levin, H. Townsend, T.J. Minello, G.R. Sutton, T.B. Francis, C.J. Harvey, J.E. Toft, K. K. Arkema, J.L. Burke, C.K. Kim, A.D. Guerry, M. Plummer, G. Spiridonov, and M. Ruckelshaus. 2014. Characterizing coastal food webs with qualitative links to bridge the gap between the theory and practice of ecosystem based management. ICES Journal of Marine Science: 71 (3): 713-724. doi: 10.1093/icesjms/fst012.
Toft, J. E., J. L. Burke, M. P. Carey, C. K. Kim, G. Spiridonov, M. Marsik, D. A. Sutherland, K. K. Arkema, A. D. Guerry, P. S. Levin, T. J. Minello, M. Plummer, M. H. Ruckelshaus and H. M. Townsend. 2014. From mountains to sound: Modelling the sensitivity of Dungeness crab and Pacific oyster to land-sea interactions in Hood Canal, WA. ICES Journal of Marine Science: 71 (3): 725-738. doi: 10.1093/icesjms/fst072.
Carey, M.P., B.L. Sanderson, K.A. Barnas, and J.D. Olden. 2012. Native invaders – challenges for science, management, policy, and society. Frontiers in Ecology and the Environment. 10(7): 373–381. doi:10.1890/110060
Carey, M.P., B.L. Sanderson, T.A. Friesen, K.A. Barnas, and J.D. Olden. 2011. Smallmouth Bass in the Pacific Northwest: A Threat to Native Species, a Benefit for Anglers. Reviews in Fisheries Science 19(3): 305-315. doi:10.1080/10641262.2011.598584
Carey, M.P. and D. H. Wahl. 2011. Foraging modes of predators and behaviors of prey determine the outcome of multiple predator interactions. Transactions of the American Fisheries Society 140: 1015-1022. doi:10.1080/00028487.2011.603983
Vanlandeghem, M., M.P. Carey, and D.H. Wahl. 2011. Turbidity-induced changes in emergent effects of multiple predators with different foraging strategies. Ecology of Freshwater 20: 279–286. doi:10.1111/j.1600-0633.2011.00494.x
Carey, M.P. and D. H. Wahl. 2011. Fish diversity as a determinant of ecosystem properties across multiple trophic levels. Oikos 120: 84–94. doi:10.1111/j.1600-0706.2010.18352.x
Carey, M. P. and D. H. Wahl. 2011. Determining the mechanism by which fish diversity influences production. Oecologia 167:189-198. doi:10.1007/s00442-011-1967-3
Carey, M. P. and D. H. Wahl. 2010. Native fish diversity alters the effects of an invasive species on food webs. Ecology 91(10):2965-2974. doi:10.1890/09-1213.1
Carey, M.P., and M.E. Mather. 2008. Tracking change in a human-dominated landscape: developing conservation guidelines using freshwater fish. Aquatic Conservation: Marine and Freshwater Ecosystems 18: 877-890.
Hrabik, T.R., M. P. Carey, and M.S. Webster. 2001. Interactions between Young-of-the-Year Exotic Rainbow Smelt and Native Yellow Perch in a Northern Temperate Lake. Transactions of the American Fisheries Society. 130: 568-582. doi:10.1577/1548-8659(2001)130<0568:IBYOTY>2.0.CO;2

**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.

USGS Scientists Podcast Interviews

USGS Scientists Podcast Interviews

In 2023, USGS Alaska Science Center scientists participated in a weekly radio program and podcast called Liquid Assets, airing on KTNA 88.9 FM, a...

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Why are Arctic Rivers Turning Orange?

Why are Arctic Rivers Turning Orange?

Permafrost thaw may be contributing to discoloration of Arctic rivers by exposing iron-bearing minerals that were previously frozen and are now...

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How Elodea Affects Juvenile Salmon Growth

How Elodea Affects Juvenile Salmon Growth

The U.S. Geological Survey, U.S. National Park Service, and U.S. Forest Service are collaborating to understand the impacts of Elodea, an invasive...

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Publication Finds That Permafrost Presence Results in Warmer Headwater Streams

Publication Finds That Permafrost Presence Results in Warmer Headwater Streams

Permafrost thaw is occurring across the Arctic with potential consequences for hydrology, ecosystems, humans, and wildlife. A team of scientists from...

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*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government

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