Mission Areas

Ecosystems

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The Ecosystems Mission Area provides impartial science information and tools to the Nation’s natural resource managers, with particular focus on the science needs of the Department of the Interior (DOI) and DOI bureaus to manage species, lands and priority ecosystems; fulfill treaty obligations; respond to and reduce threats to natural resources; and manage mineral and energy resources.

 

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Filter Total Items: 682
Date published: July 12, 2018
Status: Active

Infectious Hematopoietic Necrosis (IHN) - HSL

Fish Diseases

Infectious Hematopoietic Necrosis (IHN)

Date published: July 12, 2018
Status: Active

Bacterial Kidney Disease (BKD) - HSL

Fish Diseases

Bacterial Kidney Disease (BKD)

Date published: July 10, 2018
Status: Active

Snake River Fall Chinook Salmon Research

Snake River fall Chinook salmon were listed as “threatened” under the Endangered Species Act in 1992. At that time, little was known about the spawning, rearing, migration, and life history of this species. This long-term research and monitoring project has produced much of the contemporary knowledge on fall Chinook salmon that has been used by fish managers to implement recovery measures. The...

Contacts: Kenneth Tiffan, William Connor
Date published: July 10, 2018
Status: Active

Habitat and Landscape Alteration

USGS research on wildlife behavior, abundance, and sources of mortality are improving our understanding of the specific effects of renewable energy on wildlife and habitats. This knowledge is guiding the development of effective strategies to minimize the impact of renewable energy development on wildlife.  USGS is improving and developing software models and statistical tools that can be used...

Contacts: Mona Khalil
Date published: July 10, 2018
Status: Active

Pollinators

USGS scientists are studying how biofuel crops may be affecting pollinators, especially in the Northern Great Plains. Changes in land use from bee-friendly crops to biofuel crops likely impact pollinators.

Contacts: Mona Khalil
Date published: June 28, 2018
Status: Active

Grazing resources for integrated conservation of bison and native prairie at Badlands National Park, South Dakota

Badlands National Park (BADL) contains one of the largest protected expanses of mixed-grass prairie in the United States, much of which supports a herd of nearly wild bison. The park nevertheless is too small to accommodate bison’s natural nomadic behavior, which in the past resulted in their ephemeral but intense influence on Great Plains grasslands. This research is assessing the spatial...

Contacts: Amy Symstad
Date published: June 28, 2018
Status: Active

Fire

Accurate and timely scientific information is critical to ensure appropriate management response to wildfires and effective investments in stabilization, rehabilitation, and restoration of landscapes immediately after wildfires occur. Currently, fire management organizations lack adequate scientific information to prioritize burned regions for suppression and restoration activities.

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Date published: June 28, 2018
Status: Active

Grazing

Grazing can have different impacts on an ecosystem including as a fire suppresant. USGS scientists are examining the effects of grazing in different environments to provide land resource managers with data they can use when determining grazing plans and actions.

Date published: June 28, 2018
Status: Active

Hurricanes

Hurricanes are large-scale disturbances of such force and size that their influence on landscape pattern and processes of coastal systems is evident, though still poorly understood. The regularity and severity of tropical storms are major factors controlling ecosystem structure and succession for coastal ecosystems. Hurricane landfall rates vary greatly for given coastal stretches of the...

Date published: June 28, 2018
Status: Active

Mining

USGS scientists develop techniques for restoration and rehabilitation, provide tools that can be used to restore impaired ecosystems into healthy, resilient landscapes and watersheds that sustain plants and animals, and identify adaptation strategies for managers to plan and implement for ecosystem adaptation to natural and human-caused drivers of ecosystem change.

Date published: June 28, 2018
Status: Active

Ecosystem Impacts

USGS science helps Interior land managers predict wildfire risk and behavior by understanding fuel loads and treatments, assess the risk for landslides, air and water quality impacts post-fire, and determine the most cost-effective and/or least impactful land and water management and restoration alternatives.

Date published: June 28, 2018
Status: Active

Socio-Economics

Protecting endangered species while managing economically important species is an ongoing natural
resource management challenge. USGS research will provide managers the information they need to manage endangered native species and economically important nonnative species using economically efficient approaches. The USGS biological/economic framework is also applicable to different natural...

Filter Total Items: 97
Date published: July 14, 2016

Diamondback Terrapins in Chesapeake Bay, 2002 Beach Survey

The survey was conducted in summer 2002 to assess the presence of terrapins in the Maryland portion of the Chesapeake Bay. Results are spatial locations of evidence related to nesting.

Date published: May 2, 2016

Evidence of Absence Webinar

This video describes a statistical software package called "Evidence of Absence" that can be used to provide evidence of compliance with incidental take permits. It will be useful to wildlife managers and wind energy operators to estimate, with reasonable certainty, that a certain number of birds or bats have been killed at wind energy facilities, even when no carcasses are found.

Date published: April 27, 2016

South Florida Information Access (SOFIA)

South Florida Information Access (SOFIA) was established to provide coherent information access in support of research, decision-making, and resource management for the South Florida ecosystem restoration effort.

Date published: April 21, 2016

Sea-Level Rise Visualization for Alabama and Mississippi

The interactive sea-level rise visualization tool results from a collaborative effort between NOAA's Coastal Services Center, USGS WARC, and USGS Mississippi Water Science Center. The tool illustrates the scale of potential flooding, but not the exact location, and does not account for erosion, subsidence, sediment accretion, or future construction. 

Date published: April 21, 2016

Alabama Strategic Habitat Units Applications

WARC's Advanced Applications Team develops and maintains databases and applications to help the Alabama Department of Transportation and the U.S. Fish and Wildlife Service ensure new road construction and existing road maintenance at waterway crossings don't adversely affect threatened and endangered species dependent on those waterways. 

Date published: April 21, 2016

Hurricane Sandy Ecosystems Application Development

This showcases the data and analytical products from studies related to habitat change, storm surge and ecological modeling, migratory bird impacts, and other studies conducted at WARC and funded by the Disaster Relief Appropriations Act of 2013. WARC's Advanced Applications Team also supports the efforts of scientists conducting research in Hurricane Sandy-impacted areas. 

Date published: April 21, 2016

Coastwide Reference Monitoring System (CRMS)

CRMS is the largest of all Coastal Wetlands Planning, Protection and Restoration Act (CWPRRA) funded projects and has established a network of ~400 biological monitoring stations across coastal Louisiana spanning all coastal habitat types and generating tremendous volumes of data. 

Date published: April 21, 2016

Mississippi Coastal Improvements Program (MsCIP) Barrier Island Restoration

MsCIP was developed in 2009 by the U.S. Army Corps of Engineers, Mobile District, in conjunction with other Federal and State agencies, to help reduce future storm damage along the Mississippi Gulf coast. In 2014, in cooperation with the USACE Mobile District, WARC's Advanced Applications Team began development on the MsCIP Data Viewer, an interactive web-mapping environment. 

Date published: April 20, 2016

Coastal Wetlands Planning, Protection and Restoration Act (CWPPRA)

CWPPRA is the oldest and largest coastal restoration effort operating across coastal Louisiana and has constructed 105 restoration projects since its establishment over 20 years ago. WARC's Advanced Applications Team has proudly worked with the CWPPRA Task Force over the years to ensure timely and accurate project-specific information is publicly available. 

Date published: April 20, 2016

Joint Ecosystem Modeling (JEM) Support

The JEM community of practice is focused on ecological modeling and monitoring across the Greater Everglades, with particular interest in habitats, how various factors affect habitat change, and how the organisms dependent on those habitats respond today and into the future.

Date published: April 20, 2016

Everglades Eco-Modeling Data Visualization and Tool Development

Working with the Joint Ecosystem Modeling (JEM) community of practice, the WARC Advanced Applications Team developed and maintains the EverVIEW Data Viewer desktop visualization platform, which allows users to easily visualize and inspect standards-compliant NetCDF modeling data and has experienced tremendous feature growth driven by user feedback. 

Date published: April 20, 2016

EverVIEW Lite

Recently, the Team has developed and released EverVIEW Lite, an online web mapping framework based on the core features available in the desktop viewer.

Filter Total Items: 2,916
Year Published: 2018

Snowmelt timing regulates community composition, phenology, and physiological performance of alpine plants

The spatial patterning of alpine plant communities is strongly influenced by the variation in physical factors such as temperature and moisture, which are strongly affected by snow depth and snowmelt patterns. Earlier snowmelt timing and greater soil-moisture limitations may favor wide-ranging species adapted to a broader set of ecohydrological...

Winkler, Daniel E.; Butz, Ramona J.; Germino, Matthew J.; Reinhardt, Keith; Kueppers, Lara M.
Winkler, D.E., Butz, R.J., Germino, M.J., Reinhardt, K., Kueppers, L.M., 2018, Snowmelt timing regulates community composition, phenology, and physiological performance of alpine plants: Frontiers in Plant Science, v. 9, p. 1140, https://doi.org/10.3389/fpls.2018.01140.

Year Published: 2018

Evaluation of sockeye salmon after passage through an innovative upstream fish-passage system at Cle Elum Dam, Washington, 2017

Executive SummaryThe Bureau of Reclamation (Reclamation) and the Washington State Department of Ecology (Ecology), working with the Yakima River Basin Water Enhancement Project Workgroup (composed of representatives of the Yakama Nation; Federal, State, county, and city governments; environmental organizations; and irrigation districts), developed...

Kock, Tobias J.; Evans, Scott D.; Hansen, Amy C.; Perry, Russell W.; Hansel, Hal C.; Haner, Philip V.; Tomka, Ryan G.
Kock, T.J., Evans, S.D., Hansen, A.C., Perry, R.W., Hansel, H.C., Haner, P.V., and Tomka, R.G., 2018, Evaluation of sockeye salmon after passage through an innovative upstream fish-passage system at Cle Elum Dam, Washington, 2017: U.S. Geological Survey Open-File Report 2018-1116, 30 p., https://doi.org/10.3133/ofr20181116.

Year Published: 2018

Survival, travel time, and utilization of Yolo Bypass, California, by outmigrating acoustic-tagged late-fall Chinook salmon

Juvenile Chinook salmon (Oncorhynchus tshawytscha) migrating through California's Sacramento-San Joaquin River Delta toward the Pacific Ocean face numerous challenges to their survival. The Yolo Bypass is a broad floodplain of the Sacramento River that floods in about 70 percent of years in response to large, uncontrolled runoff events. As one of...

Pope, Adam C.; Perry, Russell W.; Hance, Dalton J.; Hansel, Hal C.
Pope, A.C., Perry, R.W., Hance, D.J., and Hansel, H.C., 2018, Survival, travel time, and utilization of Yolo Bypass, California, by outmigrating acoustic-tagged late-fall Chinook salmon: U.S. Geological Survey Open-File Report 2018-1118, 33 p., https://doi.org/10.3133/ofr20181118.

Year Published: 2018

U.S. Geological Survey response to white-nose syndrome in bats

OverviewSince its discovery in 2007, the fungal disease known as white-nose syndrome (WNS) has killed more than six million bats. Ten of 47 bat species have been affected by WNS across 32 States and 5 Canadian Provinces. The cold-growing fungus (Pseudogymnoascus destructans) that causes WNS infects skin covering the muzzle, ears, and wings of...

Hopkins, M. Camille ; Soileau, Suzanna C.
Hopkins, M.C., and Soileau, S.C., 2018, U.S. Geological Survey response to white-nose syndrome in bats: U.S. Geological Survey Fact Sheet 2018–3020, 4 p., https://doi.org/10.3133/fs20183020.

Year Published: 2018

Conservation threats and priorities for raptors across Asia

With long coastlines and some of the world’s most important rivers, mountain ranges, high-altitude plateaus, and islands, Asia is the largest and most populous continent in the world (Lyde 1904; Spencer 1954; Population Reference Bureau 2016). Asia supports all major terrestrial ecosystems and all major climatic types (Galloway et al. 1998;...

Conception, Camille B.; Bildstein, Keith L.; Collar, Nigel J.; Katzner, Todd
Conception, C.B., Bildstein, K.L., Collar, N.J., Katzner, T.E., 2018, Conservation threats and priorities for raptors across Asia In Sarasola, J.H., Grande, J.M., Negro, J.J., eds., Birds of Prey: Cham, SpringerLink, p. 395-418, https://doi.org/10.1007/978-3-319-73745-4_17.

Year Published: 2018

Post-fledging movements and habitat associations of White-tailed Sea Eagles (Haliaeetus albicilla) in Central Asia

Behavior of young birds can have important consequences for population dynamics. We investigated the autumnal post-fledging movements of 3 White-tailed Sea Eagles (Haliaeetus albicilla) hatched in Kazakhstan. All 3 eagles traveled south, flying on average 25–108 km/d. Movement was nonrandom, with eagles generally traveling near mosaics of forest,...

Bragin, Evgeny A.; Poessel, Sharon; Lanzone, Michael J.; Katzner, Todd
Bragin, E.A., Poessel, S.A., Lanzone, M.J., Katzner, T.E., 2018, Post-fledging movements and habitat associations of White-tailed Sea Eagles (Haliaeetus albicilla) in central Asia: The Wilson Journal of Ornithology, p. online, https://doi.org/10.1676/17-055.1.

Year Published: 2018

Assessing the effectiveness of riparian restoration projects using Landsat and precipitation data from the cloud-computing application ClimateEngine.org

Riparian vegetation along streams provides a suite of ecosystem services in rangelands and thus is the target of restoration when degraded by over-grazing, erosion, incision, or other disturbances. Assessments of restoration effectiveness depend on defensible monitoring data, which can be both expensive and difficult to collect. We present a...

Hausner, Mark B.; Huntington, Justin L.; Nash, Caroline; Morton, Charles; McEvoy, Daniel J.; Pilliod, David S.; Hegewisch, Katherine C.; Daudert, Britta; Abatzoglou, John T.; Grant, Gordon E.
Hausner, M.B., Huntington, J.L., Nash, C., Morton, C., McEvoy, D.J., Pilliod, D.S., Hegewisch, K.C., Daudert, B., Abatzoglou, J.T., Grant, G.E., 2018, Assessing the effectiveness of riparian restoration projects using Landsat and precipitation data from the cloud-computing application ClimateEngine.org: Ecological Engineering, v. 120, no. 2018, p. 432-440, https://doi.org/10.1016/j.ecoleng.2018.06.024.

Year Published: 2018

Post-spring migration colony-site prospecting by Roseate Terns (Sterna dougallii)

We recorded banded Roseate Terns (Sterna dougallii) and unbanded individuals mated to banded individuals in May and the first third of June in 2001 and 2002 to quantify post spring migration prospecting by this species at Falkner Island, Connecticut, USA. In 2001, more than one quarter: 34/125 (27.2%) of those observed by 19 May and 38/150 (25.3...

Spendelow, Jeffrey A.; Eichenwald, Adam J.
Spendelow, J. A. and Eichenwald, A. J., 2018, Post-Spring Migration Colony-site Prospecting by Roseate Terns (Sterna dougallii): North American Bird Bander, v. 43, no. 1, p. 1-6.

Year Published: 2018

Bat community response to silvicultural treatments in bottomland hardwood forests managed for wildlife in the Mississippi Alluvial Valley

Silvicultural treatments (e.g., selective timber harvests) that are prescribed to promote wildlife habitat are intended to alter the physical structure of forests to achieve conditions deemed beneficial for wildlife. Such treatments have been advocated for management of bottomland hardwood forests on public conservation lands in the Mississippi...

Ketzler, Loraine P.; Comer, Christopher E.; Twedt, Daniel J.
Ketzler, L. P., Comer, C. E., and Twedt, D. J., 2018, Bat community response to silvicultural treatments in bottomland hardwood forests managed for wildlife in the Mississippi Alluvial Valley: Forest Ecology and Management, v. 417, p. 40-48. https://doi.org/10.1016/j.foreco.2018.02.047

Year Published: 2018

Juvenile salmonid monitoring following removal of Condit Dam in the White Salmon River Watershed, Washington, 2017

Condit Dam, at river kilometer 5.3 on the White Salmon River, Washington, was breached in 2011, and removed completely in 2012, providing anadromous salmonids with the opportunity to recolonize habitat blocked for nearly 100 years. Prior to dam removal, a multi-agency workgroup concluded that the preferred salmonid restoration alternative was to...

Jezorek, Ian G.; Hardiman, Jill M.
Jezorek, I.G., and Hardiman, J.M., 2018, Juvenile salmonid monitoring following removal of Condit Dam in the White Salmon River watershed, Washington, 2017: U.S. Geological Survey Open-File Report 2018-1106, 31 p. https://doi.org/10.3133/ofr20181106.

Year Published: 2018

On the reliability of N‐mixture models for count data

N‐mixture models describe count data replicated in time and across sites in terms of abundance N and detectability p. They are popular because they allow inference about N while controlling for factors that influence p without the need for marking animals. Using a capture–recapture perspective, we show that the loss of information that results...

Barker, Richard J.; Schofield, Matthew J.; Link, William A.; Sauer, John R.
Baker, R. J., Schofield, M. R., Link, W. A., and Sauer, J. R., 2018, On the reliability of N-mixture models for count data: Biometrics, v. 74, no. 1, p. 369-377. https://doi.org/10.1111/biom.12734

Year Published: 2018

Variation in inbreeding rates across the range of Northern Spotted Owls (Strix occidentalis caurina): Insights from over 30 years of monitoring data

Inbreeding has been difficult to quantify in wild populations because of incomplete parentage information. We applied and extended a recently developed framework for addressing this problem to infer inbreeding rates in Northern Spotted Owls (Strix occidentalis caurina) across the Pacific Northwest, USA. Using pedigrees from 14,187 Northern Spotted...

Miller, Mark P.; Haig, Susan M.; Forsman, Eric D.; Anthony, Robert G.; Diller, Lowell; Dugger, Katie M.; Franklin, Alan B.; Fleming, Tracy L.; Gremel, Scott; Lesmeister, Damon B.; Higley, Mark; Herter, Dale R.; Sovern, Stan G
Miller, M.P., Haig, S.M., Forsman, E.D., Anthony, R.G., Diller, L., Dugger, K.M., Franklin, A.B., Gremel, S.A., Lesmeister, D.B., Higley, M., Herter, D.R., Sovern, S.G., 2018, Variation in inbreeding rates across the range of Northern Spotted Owls (Strix occidentalis caurina)- insights from over 30 years of monitoring data: The Auk: Ornithological Advances, v. 135, no. 4, p. 821-833, https://doi.org/10.1642/AUK-18-1.1.

Filter Total Items: 681
Close-up of dried, cracked soil with small plants trying to survive in this soil.
December 31, 2017

Dry, cracked soil (RAMPS)

Rangelands of the desert Southwest can be in a degraded condition and lacking perennial vegetation, which can lead to exposed soil and erosion. RAMPS is working to mitigate degradation by increasing 

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Brown bears (Ursus arctos) and Chum (Salmon Oncorhynchus)
December 31, 2017

Brown bears (Ursus arctos) and Chum (Salmon Oncorhynchus)

Bear predation on salmon can be high in many Alaskan rivers.  Brown bears Ursus arctos and Chum Salmon Oncorhynchus keta are managed concurrently in McNeil River State Game Sanctuary by Alaska Dept. of Fish and Game to benefit the salmon, bears, commercial fishers, and provide unparalleled close-up bear viewing and photography opportunities for the public. 

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Frog liver with SPI
December 31, 2017

Frog liver with SPI

This photomicrograph shows a liver of a frog with a severe Perkinsea infection.

Sea turtle
December 31, 2017

Sea turtle

Green sea turtles are listed as threatened or endangered throughout their range. (Credit: Thierry Work, USGS)

Attribution: Ecosystems
Chelonid herpesvirus 5 replication
December 31, 2017

Chelonid herpesvirus 5 replication

This microscopic image shows a sun-shaped area within turtle skin cells where chelonid herpesvirus 5 replicates. The virus capsids, or protein shells, are arrayed like a corona around the circle. ChHV5 is associated with fibropapillomatosisa tumor disease affecting endangered green turtles. (Credit: Thierry Work,

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Alligator Hatchlings
December 31, 2017

Alligator Hatchlings

Crocodilians are one of the few reptile taxa that exhibit parental care. In alligators, following nest construction, females stay nearby in a guard hole, and are known to defend their nests against predators or other intruders. At the end of the 60-day incubation period, alligator hatchlings will vocalize from within the egg, to signal to the mother that they are ready to

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Phragmites, an invasive grass
December 31, 2017

Phragmites, an invasive grass

Introduced Phragmites australis, also called the common reed, is an invasive grass in the Great Lakes.

Emperor geese standing near the shoreline on Kodiak Island
December 31, 2017

Emperor geese near Kodiak.

Emperor geese gathered near the shoreline on Kodiak Island.

Measuring sea urchins 1
December 31, 2017

Measuring sea urchins 1

When it comes to collecting data, sometimes scientists have to look beneath the surface. Here, USGS scientists count and measure sea urchins to better understand the species' demographics off the coast of Oahu, Hawaii. This information will help managers best respond to urchin die-offs, should they occur in the future.

USGS scientist Sarah Fitzgerald holds a surf scoter that has been fitted with a satellite tag.
December 31, 2017

USGS scientist holds a surf scoter that has been tagged.

USGS scientist Sarah Fitzgerald holds a surf scoter that has been fitted with a satellite tag that works by transmitting the location of the birds to satellites that are orbiting the Earth. (Jonathan Fiely, USGS)

Sea Lamprey Larvae in Electrofishing Basket
December 31, 2017

Sea Lamprey Larvae in Electrofishing Basket

This image shows sea lamprey in their larvae phase.

Slower sea lamprey growth rates during the larval phase of development may increase the odds of sea lampreys becoming male, according to a USGS study. Sea lampreys are an invasive, parasitic species of fish damaging the Great Lakes.

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Sea Lamprey Larvae in Hand
December 31, 2017

Sea Lamprey Larvae in Hand

This image shows a sea lamprey in its larvae phase.

Slower sea lamprey growth rates during the larval phase of development may increase the odds of sea lampreys becoming male, according to a USGS study. Sea lampreys are an invasive, parasitic species of fish damaging the Great Lakes.

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Filter Total Items: 323
Date published: June 6, 2017

Scientists Discover New Species of Fijian Iguana

Researchers from the U.S. Geological Survey, Taronga Conservation Society Australia, The National Trust of Fiji and NatureFiji-MareqetiViti have discovered a new species of banded iguana.

Date published: June 6, 2017

Increased Sea Ice Drift Puts Polar Bears on Faster Moving Treadmill

A new study led by the U.S. Geological Survey and the University of Wyoming found that increased westward ice drift in the Beaufort and Chukchi seas requires polar bears to expend more energy walking eastward on a faster moving “treadmill” of sea ice.  

Date published: June 6, 2017

USGS Bridging Generations with WWII Technology

On June 6, 1944, thousands of men rained down from the skies onto the battlegrounds of Normandy. After five grueling years of war that shook the globe, D-Day’s victory swept the Allied nations into a wave of celebration.

Date published: June 5, 2017

New USGS Science Plan Designed to Help Plan for Drought Effects on People, Communities, and Ecosystems

The U. S. Geological Survey is poised to bring a dynamic array of science and tools to help decision-makers manage and offset effects of increased drought across the United States, according to a drought plan report released today.

Date published: June 1, 2017

Alabama Survey Finds First Southeastern Bat with White-Nose Syndrome

Biologists have confirmed white-nose syndrome in the southeastern bat, or Myotis austroriparius, for the first time. The species joins eight other hibernating bat species in North America that are afflicted with the deadly bat fungal disease.

Date published: May 31, 2017

USGS Finds 28 Types of Cyanobacteria in Florida Algal Bloom

A new U.S. Geological Survey study that looked at the extensive harmful algal bloom that plagued Florida last year found far more types of cyanobacteria present than previously known.

Date published: May 25, 2017

Mapping Chesapeake's Future From Today's Land Use

USGS’ pixel-by-pixel land use forecasts offer essential road maps for restoration. 

Date published: May 15, 2017

Western Fisheries Science News, April 2017 | Issue 5.4

Dr. Jim Winton Retires After Long Distinguished Career

Date published: May 10, 2017

Glaciers Rapidly Shrinking and Disappearing: 50 Years of Glacier Change in Montana

The warming climate has dramatically reduced the size of 39 glaciers in Montana since 1966, some by as much as 85 percent, according to data released by the U.S. Geological Survey and Portland State University.

Date published: May 3, 2017

Migrating mule deer track “green waves” of spring forage: study highlights importance of habitat corridors for migrating game and other species

Migratory mule deer in Wyoming closely time their movements to track the spring green-up, providing evidence of an underappreciated foraging benefit of migration, according to a study by University of Wyoming and U.S. Geological Survey scientists at the Wyoming Cooperative Fish and Wildlife Research Unit.

Date published: May 3, 2017

Wind Turbines Affect Behavior of Desert Tortoise Predators

How a wind energy facility is designed can influence the behavior of animal predators and their prey, according to a recent study published in The Journal of Wildlife Management by researchers at the University of California, Davis, and the U.S. Geological Survey.