Identifying and sorting clams by species. This sample came from benthic trawls on the Norseman II.
In addition to the direct effects of sea ice loss on walrus (Odobenus rosmarus divergens) and polar bears (Ursus maritimus) that use ice as a platform, the decline of Arctic sea ice is predicted to promote a fundamental ecosystem shift from benthic animals that forage on the sea floor to pelagic animals that forage near the sea surface.
Sources/Usage: Some content may have restrictions. View Media Details
Return to Ecosystems >> Fish and Aquatic Ecology
This shift would essentially result in Arctic seas transforming to ecosystems that resemble their temperate southern counterparts and raises concerns for walrus and eiders that are adapted to feed on the historically rich community of abundant benthic organisms. As sea ice extent diminishes, more prolonged open-water phytoplankton blooms and increased zooplankton grazing may increasingly route surface primary production to pelagic consumers and away from the sea floor. The change in benthic production has been difficult to quantify, leaving resource managers with much uncertainty. We propose to relate annually resolved growth increments in benthic bivalves (clams) with satellite derived sea ice records to develop a predictive relationship between sea ice and benthic production in the Chukchi Sea. Bivalve clams are a key prey item for both walrus and eiders. The relative contributions of sea ice algae and phytoplankton, the two major sources of surface primary production, will also be described for bivalves using stable isotope analysis of soft tissue. Combining these products with model projections of future sea ice cover will allow us to predict the pace of shifts in benthic production, clarify the underlying mechanism, and enhance forecasts of the population response of DOI managed species to a changing Arctic environment.
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Below are other science projects associated with this project.
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...
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.
Nearshore Fish Surveys in the Beaufort Sea
Nearshore systems provide habitat to a unique community of marine and diadromous (lives in both fresh and saltwater) fish and support high fish abundance.
Condition of Forage Fish in Prince William Sound During the Marine Heatwave
Changes in the body condition of a key forage fish species, Pacific sand lance ( Ammodytes personatus), are examined to understand how energy transfer to predators may have been disrupted during the recent marine heatwave in the North Pacific (late 2013 to mid 2016).
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.
Arctic Lake Food Webs
From 2011 to 2013 we investigated freshwater food webs of Arctic Coastal Plain lakes in Alaska to improve our understanding how Arctic freshwater food webs may respond to landscape change the warmer, drier future.
Lake Trout Biochronologies as Long-term Climate and Productivity Indicators in Alaska Lake Ecosystems
High latitude ecosystems are among the most vulnerable to long-term climate change, yet continuous, multidecadal indicators by which to gauge effects on biology are scarce, especially in freshwater environments.
Primary Production Sources and Bottom-up Limitations in Nearshore Ecosystems
Kelp forests are among the world’s most productive habitats, but recent evidence suggests that production is highly variable.
Hydro-Ecology of Arctic Thawing (HEAT): Ecology
Permafrost thaw is leading to a myriad of changes in physical and chemical conditions throughout the Arctic.
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.
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.
Below are multimedia items associated with this project.
Identifying and sorting clams by species
Identifying and sorting clams by species. This sample came from benthic trawls on the Norseman II.
Pacific walrus hauled out on sea ice in the Chukchi Sea
Pacific walrus hauled out on sea ice in the Chukchi Sea.
Pacific walrus hauled out on sea ice in the Chukchi Sea.
Biologists sorting through benthic invertebrates for bivalves
Biologists sorting through buckets of benthic invertebrates looking for bivalves onboard the Norseman II in the Chukchi Sea.
Biologists sorting through buckets of benthic invertebrates looking for bivalves onboard the Norseman II in the Chukchi Sea.
Jannelle Trowbridge sorts through benthic invertebrates for bivalves
ANSEP intern Jannelle Trowbridge sorts through a catch of benthic invertebrates for bivalves on the Norseman II. This was from the Ecosystem Shifts in Arctic Seas project.
ANSEP intern Jannelle Trowbridge sorts through a catch of benthic invertebrates for bivalves on the Norseman II. This was from the Ecosystem Shifts in Arctic Seas project.
Benthic invertebrates captured in a bottom trawl
Benthic invertebrates captured in a bottom trawl. This was from the Ecosystem Shifts in Arctic Seas project.
Benthic invertebrates captured in a bottom trawl. This was from the Ecosystem Shifts in Arctic Seas project.
2015 benthic field sampling team
The 2015 benthic field sampling team Jannelle Trowbridge, Vanessa von Biela, Carolynn Harris, and Thomas Nguyen. This was from the Ecosystem Shifts in Arctic Seas project.
The 2015 benthic field sampling team Jannelle Trowbridge, Vanessa von Biela, Carolynn Harris, and Thomas Nguyen. This was from the Ecosystem Shifts in Arctic Seas project.
Chukchi Sea sea ice
Sea ice in the Chukchi Sea.
Sea ice in the Chukchi Sea.
In addition to the direct effects of sea ice loss on walrus (Odobenus rosmarus divergens) and polar bears (Ursus maritimus) that use ice as a platform, the decline of Arctic sea ice is predicted to promote a fundamental ecosystem shift from benthic animals that forage on the sea floor to pelagic animals that forage near the sea surface.
Sources/Usage: Some content may have restrictions. View Media Details
Return to Ecosystems >> Fish and Aquatic Ecology
This shift would essentially result in Arctic seas transforming to ecosystems that resemble their temperate southern counterparts and raises concerns for walrus and eiders that are adapted to feed on the historically rich community of abundant benthic organisms. As sea ice extent diminishes, more prolonged open-water phytoplankton blooms and increased zooplankton grazing may increasingly route surface primary production to pelagic consumers and away from the sea floor. The change in benthic production has been difficult to quantify, leaving resource managers with much uncertainty. We propose to relate annually resolved growth increments in benthic bivalves (clams) with satellite derived sea ice records to develop a predictive relationship between sea ice and benthic production in the Chukchi Sea. Bivalve clams are a key prey item for both walrus and eiders. The relative contributions of sea ice algae and phytoplankton, the two major sources of surface primary production, will also be described for bivalves using stable isotope analysis of soft tissue. Combining these products with model projections of future sea ice cover will allow us to predict the pace of shifts in benthic production, clarify the underlying mechanism, and enhance forecasts of the population response of DOI managed species to a changing Arctic environment.
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Sources/Usage: Public Domain. View Media Details
Below are other science projects associated with this project.
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...
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.
Nearshore Fish Surveys in the Beaufort Sea
Nearshore systems provide habitat to a unique community of marine and diadromous (lives in both fresh and saltwater) fish and support high fish abundance.
Condition of Forage Fish in Prince William Sound During the Marine Heatwave
Changes in the body condition of a key forage fish species, Pacific sand lance ( Ammodytes personatus), are examined to understand how energy transfer to predators may have been disrupted during the recent marine heatwave in the North Pacific (late 2013 to mid 2016).
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.
Arctic Lake Food Webs
From 2011 to 2013 we investigated freshwater food webs of Arctic Coastal Plain lakes in Alaska to improve our understanding how Arctic freshwater food webs may respond to landscape change the warmer, drier future.
Lake Trout Biochronologies as Long-term Climate and Productivity Indicators in Alaska Lake Ecosystems
High latitude ecosystems are among the most vulnerable to long-term climate change, yet continuous, multidecadal indicators by which to gauge effects on biology are scarce, especially in freshwater environments.
Primary Production Sources and Bottom-up Limitations in Nearshore Ecosystems
Kelp forests are among the world’s most productive habitats, but recent evidence suggests that production is highly variable.
Hydro-Ecology of Arctic Thawing (HEAT): Ecology
Permafrost thaw is leading to a myriad of changes in physical and chemical conditions throughout the Arctic.
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.
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.
Below are multimedia items associated with this project.
Identifying and sorting clams by species
Identifying and sorting clams by species. This sample came from benthic trawls on the Norseman II.
Identifying and sorting clams by species. This sample came from benthic trawls on the Norseman II.
Pacific walrus hauled out on sea ice in the Chukchi Sea
Pacific walrus hauled out on sea ice in the Chukchi Sea.
Pacific walrus hauled out on sea ice in the Chukchi Sea.
Biologists sorting through benthic invertebrates for bivalves
Biologists sorting through buckets of benthic invertebrates looking for bivalves onboard the Norseman II in the Chukchi Sea.
Biologists sorting through buckets of benthic invertebrates looking for bivalves onboard the Norseman II in the Chukchi Sea.
Jannelle Trowbridge sorts through benthic invertebrates for bivalves
ANSEP intern Jannelle Trowbridge sorts through a catch of benthic invertebrates for bivalves on the Norseman II. This was from the Ecosystem Shifts in Arctic Seas project.
ANSEP intern Jannelle Trowbridge sorts through a catch of benthic invertebrates for bivalves on the Norseman II. This was from the Ecosystem Shifts in Arctic Seas project.
Benthic invertebrates captured in a bottom trawl
Benthic invertebrates captured in a bottom trawl. This was from the Ecosystem Shifts in Arctic Seas project.
Benthic invertebrates captured in a bottom trawl. This was from the Ecosystem Shifts in Arctic Seas project.
2015 benthic field sampling team
The 2015 benthic field sampling team Jannelle Trowbridge, Vanessa von Biela, Carolynn Harris, and Thomas Nguyen. This was from the Ecosystem Shifts in Arctic Seas project.
The 2015 benthic field sampling team Jannelle Trowbridge, Vanessa von Biela, Carolynn Harris, and Thomas Nguyen. This was from the Ecosystem Shifts in Arctic Seas project.
Chukchi Sea sea ice
Sea ice in the Chukchi Sea.
Sea ice in the Chukchi Sea.