Skip to main content
U.S. flag

An official website of the United States government

John M. Pearce, Ph.D. (Former Employee)

Science and Products

Filter Total Items: 42
Andrew Reeves retrieving samples at Izembek National Wildlife Refuge, Alaska

Collaborative Science for Priority Information Needs

One of the primary missions of the USGS is to address the science needs of Department of Interior bureaus, particularly those that manage natural resources and lands. This mission is fulfilled through the research and other activities of USGS scientists but also specifically through three USGS nationally-funded programs listed below.
By
Alaska Science Center
Collaborative Science for Priority Information Needs

Collaborative Science for Priority Information Needs

One of the primary missions of the USGS is to address the science needs of Department of Interior bureaus, particularly those that manage natural resources and lands. This mission is fulfilled through the research and other activities of USGS scientists but also specifically through three USGS nationally-funded programs listed below.
Learn More
close up of Pacific walruses resting on the beach, Alaska

Tracking Data Releases

U.S. Geological Survey, Alaska Science Center, has additional released tracking data sets of Polar Bears, Greater White-fronted Goose, and Black Brant.
By
Alaska Science Center
Tracking Data Releases

Tracking Data Releases

U.S. Geological Survey, Alaska Science Center, has additional released tracking data sets of Polar Bears, Greater White-fronted Goose, and Black Brant.
Learn More
Gulkana Glacier

Alaska's Changing Habitats: A Multi-System Approach for Understanding Climate Impacts in High Latitude Regions

Scientific information can be used to help individuals, communities, and governments alike make more informed decisions. However, for people to become aware of the science that could inform their decisions and its relevance to their lives and decisions, it must be communicated effectively. Multiple obstacles prevent this from happening, including scientists’ lack of time and...
By
Climate Adaptation Science Centers
Alaska's Changing Habitats: A Multi-System Approach for Understanding Climate Impacts in High Latitude Regions

Alaska's Changing Habitats: A Multi-System Approach for Understanding Climate Impacts in High Latitude Regions

Scientific information can be used to help individuals, communities, and governments alike make more informed decisions. However, for people to become aware of the science that could inform their decisions and its relevance to their lives and decisions, it must be communicated effectively. Multiple obstacles prevent this from happening, including scientists’ lack of time and communication expertis
Learn More
A polar bear in a pool.

Q&A: Polar Bears and Zoos

Polar bears are found throughout the circumpolar Arctic and roam across miles of sea ice and land. They prefer to eat blubber, especially from seals that are also found on the sea ice. However, the sea ice habitat of polar bears is changing rapidly with substantial recent declines in the extent of sea ice in the Arctic. These changes are leading polar bears to spend more time on land in some areas...
By
Alaska Science Center
Q&A: Polar Bears and Zoos

Q&A: Polar Bears and Zoos

Polar bears are found throughout the circumpolar Arctic and roam across miles of sea ice and land. They prefer to eat blubber, especially from seals that are also found on the sea ice. However, the sea ice habitat of polar bears is changing rapidly with substantial recent declines in the extent of sea ice in the Arctic. These changes are leading polar bears to spend more time on land in some areas...
Learn More
Common Murres in their colony in Cook Inlet, Alaska. Adult touching bill to chick.

Q&A: Cook Inlet Seabird and Forage Fish Study

Alaska has over 6,500 miles of coastline and the marine areas off these coasts are some of the most productive in the world in terms of fish and the seabirds that often feed on those fish. Almost 100 million seabirds breed and nest along the rocky and grassy coastlines of Alaska. The status and population trends of fish and seabirds is of interest to many people in Alaska because their abundance...
By
Alaska Science Center
Q&A: Cook Inlet Seabird and Forage Fish Study

Q&A: Cook Inlet Seabird and Forage Fish Study

Alaska has over 6,500 miles of coastline and the marine areas off these coasts are some of the most productive in the world in terms of fish and the seabirds that often feed on those fish. Almost 100 million seabirds breed and nest along the rocky and grassy coastlines of Alaska. The status and population trends of fish and seabirds is of interest to many people in Alaska because their abundance...
Learn More
A view of the sea and the mountains in Prince William Sound

Q&A: Virtual Student Federal Service

The USGS is always looking for new ways to work with students. Student involvement in our science provides the USGS with new perspectives on how to communicate and enhance the work that we do. The USGS also realizes the potential that our work has to provide new skills and career opportunities, not only in scientific research, but in science communication and outreach, data management, and...
By
Alaska Science Center
Q&A: Virtual Student Federal Service

Q&A: Virtual Student Federal Service

The USGS is always looking for new ways to work with students. Student involvement in our science provides the USGS with new perspectives on how to communicate and enhance the work that we do. The USGS also realizes the potential that our work has to provide new skills and career opportunities, not only in scientific research, but in science communication and outreach, data management, and...
Learn More
No Result Found
Filter Total Items: 29
No results found.
Filter Total Items: 80

Changing Arctic ecosystems--the role of ecosystem changes across the Boreal-Arctic transition zone on the distribution and abundance of wildlife populations Changing Arctic ecosystems--the role of ecosystem changes across the Boreal-Arctic transition zone on the distribution and abundance of wildlife populations

Arctic and boreal ecosystems provide important breeding habitat for more than half of North America’s migratory birds as well as many resident species. Northern landscapes are projected to experience more pronounced climate-related changes in habitat than most other regions. These changes include increases in shrub growth, conversion of tundra to forest, alteration of wetlands, shifts in...
Authors
Lance McNew, Colleen M. Handel, John M. Pearce, Anthony R. DeGange, Leslie Holland-Bartels, Mary E. Whalen
By
Ecosystems Mission Area, Alaska Science Center

Genomic analysis of avian influenza viruses from waterfowl in Western Alaska, USA Genomic analysis of avian influenza viruses from waterfowl in Western Alaska, USA

The Yukon-Kuskokwim Delta (Y-K Delta) in western Alaska is an immense and important breeding ground for waterfowl. Migratory birds from the Pacific Americas, Central Pacific, and East Asian-Australasian flyways converge in this region, providing opportunities for intermixing of North American- and Eurasian-origin hosts and infectious agents, such as avian influenza virus (AIV). We...
Authors
Andrew B. Reeves, John M. Pearce, Andrew M. Ramey, Craig R. Ely, Joel A. Schmutz, Paul L. Flint, Dirk V. Derksen, S. Ip, Kimberly A. Trust
By
Ecosystems Mission Area, Alaska Science Center, National Wildlife Health Center

Wildlife disease and environmental health in Alaska Wildlife disease and environmental health in Alaska

Environmental health is defined by connections between the physical environment, ecological health, and human health. Current research within the U.S. Geological Survey (USGS) recognizes the importance of this integrated research philosophy, which includes study of disease and pollutants as they pertain to wildlife and humans. Due to its key geographic location and significant wildlife...
Authors
Caroline R. Van Hemert, John M. Pearce, Karen Oakley, Mary E. Whalen
By
Ecosystems Mission Area, Alaska Science Center

Evidence that life history characteristics of wild birds influence infection rates and exposure to influenza A viruses Evidence that life history characteristics of wild birds influence infection rates and exposure to influenza A viruses

We report on life history characteristics, temporal, and age-related effects influencing the frequency of occurrence of avian influenza (AI) viruses in four species of migratory geese breeding on the Yukon-Kuskokwim Delta, Alaska. Emperor geese (Chen canagica), cackling geese (Branta hutchinsii), greater white-fronted geese (Anser albifrons), and black brant (Branta bernicla), were all...
Authors
Craig R. Ely, Jeffrey S. Hall, Joel A. Schmutz, John M. Pearce, John Terenzi, James S. Sedinger, S. Ip
By
Ecosystems Mission Area, Alaska Science Center, National Wildlife Health Center

Changing Arctic ecosystems - measuring and forecasting the response of Alaska's terrestrial ecosystem to a warming climate Changing Arctic ecosystems - measuring and forecasting the response of Alaska's terrestrial ecosystem to a warming climate

The Arctic Coastal Plain of northern Alaska is a complex landscape of lakes, streams, and wetlands scattered across low relief tundra that is underlain by permafrost. This region of the Arctic has experienced a warming trend over the past three decades, leading to thawing of on-shore permafrost and the disappearance of sea ice at an unprecedented rate. The loss of sea ice has increased...
Authors
John M. Pearce, Anthony R. DeGange, Paul L. Flint, Tom F. Fondell, David D. Gustine, Leslie E. Holland-Bartels, Andrew G. Hope, Jerry W. Hupp, Joshua C. Koch, Joel A. Schmutz, Sandra L. Talbot, David H. Ward, Mary E. Whalen
By
Ecosystems Mission Area, Alaska Science Center

Molecular detection of hematozoa infections in tundra swans relative to migration patterns and ecological conditions at breeding grounds Molecular detection of hematozoa infections in tundra swans relative to migration patterns and ecological conditions at breeding grounds

Tundra swans (Cygnus columbianus) are broadly distributed in North America, use a wide variety of habitats, and exhibit diverse migration strategies. We investigated patterns of hematozoa infection in three populations of tundra swans that breed in Alaska using satellite tracking to infer host movement and molecular techniques to assess the prevalence and genetic diversity of parasites...
Authors
Andrew M. Ramey, Craig R. Ely, Joel A. Schmutz, John M. Pearce, Darryl J. Heard
By
Ecosystems Mission Area, Alaska Science Center

Science and Products

Filter Total Items: 42
Andrew Reeves retrieving samples at Izembek National Wildlife Refuge, Alaska

Collaborative Science for Priority Information Needs

One of the primary missions of the USGS is to address the science needs of Department of Interior bureaus, particularly those that manage natural resources and lands. This mission is fulfilled through the research and other activities of USGS scientists but also specifically through three USGS nationally-funded programs listed below.
By
Alaska Science Center
Collaborative Science for Priority Information Needs

Collaborative Science for Priority Information Needs

One of the primary missions of the USGS is to address the science needs of Department of Interior bureaus, particularly those that manage natural resources and lands. This mission is fulfilled through the research and other activities of USGS scientists but also specifically through three USGS nationally-funded programs listed below.
Learn More
close up of Pacific walruses resting on the beach, Alaska

Tracking Data Releases

U.S. Geological Survey, Alaska Science Center, has additional released tracking data sets of Polar Bears, Greater White-fronted Goose, and Black Brant.
By
Alaska Science Center
Tracking Data Releases

Tracking Data Releases

U.S. Geological Survey, Alaska Science Center, has additional released tracking data sets of Polar Bears, Greater White-fronted Goose, and Black Brant.
Learn More
Gulkana Glacier

Alaska's Changing Habitats: A Multi-System Approach for Understanding Climate Impacts in High Latitude Regions

Scientific information can be used to help individuals, communities, and governments alike make more informed decisions. However, for people to become aware of the science that could inform their decisions and its relevance to their lives and decisions, it must be communicated effectively. Multiple obstacles prevent this from happening, including scientists’ lack of time and...
By
Climate Adaptation Science Centers
Alaska's Changing Habitats: A Multi-System Approach for Understanding Climate Impacts in High Latitude Regions

Alaska's Changing Habitats: A Multi-System Approach for Understanding Climate Impacts in High Latitude Regions

Scientific information can be used to help individuals, communities, and governments alike make more informed decisions. However, for people to become aware of the science that could inform their decisions and its relevance to their lives and decisions, it must be communicated effectively. Multiple obstacles prevent this from happening, including scientists’ lack of time and communication expertis
Learn More
A polar bear in a pool.

Q&A: Polar Bears and Zoos

Polar bears are found throughout the circumpolar Arctic and roam across miles of sea ice and land. They prefer to eat blubber, especially from seals that are also found on the sea ice. However, the sea ice habitat of polar bears is changing rapidly with substantial recent declines in the extent of sea ice in the Arctic. These changes are leading polar bears to spend more time on land in some areas...
By
Alaska Science Center
Q&A: Polar Bears and Zoos

Q&A: Polar Bears and Zoos

Polar bears are found throughout the circumpolar Arctic and roam across miles of sea ice and land. They prefer to eat blubber, especially from seals that are also found on the sea ice. However, the sea ice habitat of polar bears is changing rapidly with substantial recent declines in the extent of sea ice in the Arctic. These changes are leading polar bears to spend more time on land in some areas...
Learn More
Common Murres in their colony in Cook Inlet, Alaska. Adult touching bill to chick.

Q&A: Cook Inlet Seabird and Forage Fish Study

Alaska has over 6,500 miles of coastline and the marine areas off these coasts are some of the most productive in the world in terms of fish and the seabirds that often feed on those fish. Almost 100 million seabirds breed and nest along the rocky and grassy coastlines of Alaska. The status and population trends of fish and seabirds is of interest to many people in Alaska because their abundance...
By
Alaska Science Center
Q&A: Cook Inlet Seabird and Forage Fish Study

Q&A: Cook Inlet Seabird and Forage Fish Study

Alaska has over 6,500 miles of coastline and the marine areas off these coasts are some of the most productive in the world in terms of fish and the seabirds that often feed on those fish. Almost 100 million seabirds breed and nest along the rocky and grassy coastlines of Alaska. The status and population trends of fish and seabirds is of interest to many people in Alaska because their abundance...
Learn More
A view of the sea and the mountains in Prince William Sound

Q&A: Virtual Student Federal Service

The USGS is always looking for new ways to work with students. Student involvement in our science provides the USGS with new perspectives on how to communicate and enhance the work that we do. The USGS also realizes the potential that our work has to provide new skills and career opportunities, not only in scientific research, but in science communication and outreach, data management, and...
By
Alaska Science Center
Q&A: Virtual Student Federal Service

Q&A: Virtual Student Federal Service

The USGS is always looking for new ways to work with students. Student involvement in our science provides the USGS with new perspectives on how to communicate and enhance the work that we do. The USGS also realizes the potential that our work has to provide new skills and career opportunities, not only in scientific research, but in science communication and outreach, data management, and...
Learn More
No Result Found
Filter Total Items: 29
No results found.
Filter Total Items: 80

Changing Arctic ecosystems--the role of ecosystem changes across the Boreal-Arctic transition zone on the distribution and abundance of wildlife populations Changing Arctic ecosystems--the role of ecosystem changes across the Boreal-Arctic transition zone on the distribution and abundance of wildlife populations

Arctic and boreal ecosystems provide important breeding habitat for more than half of North America’s migratory birds as well as many resident species. Northern landscapes are projected to experience more pronounced climate-related changes in habitat than most other regions. These changes include increases in shrub growth, conversion of tundra to forest, alteration of wetlands, shifts in...
Authors
Lance McNew, Colleen M. Handel, John M. Pearce, Anthony R. DeGange, Leslie Holland-Bartels, Mary E. Whalen
By
Ecosystems Mission Area, Alaska Science Center

Genomic analysis of avian influenza viruses from waterfowl in Western Alaska, USA Genomic analysis of avian influenza viruses from waterfowl in Western Alaska, USA

The Yukon-Kuskokwim Delta (Y-K Delta) in western Alaska is an immense and important breeding ground for waterfowl. Migratory birds from the Pacific Americas, Central Pacific, and East Asian-Australasian flyways converge in this region, providing opportunities for intermixing of North American- and Eurasian-origin hosts and infectious agents, such as avian influenza virus (AIV). We...
Authors
Andrew B. Reeves, John M. Pearce, Andrew M. Ramey, Craig R. Ely, Joel A. Schmutz, Paul L. Flint, Dirk V. Derksen, S. Ip, Kimberly A. Trust
By
Ecosystems Mission Area, Alaska Science Center, National Wildlife Health Center

Wildlife disease and environmental health in Alaska Wildlife disease and environmental health in Alaska

Environmental health is defined by connections between the physical environment, ecological health, and human health. Current research within the U.S. Geological Survey (USGS) recognizes the importance of this integrated research philosophy, which includes study of disease and pollutants as they pertain to wildlife and humans. Due to its key geographic location and significant wildlife...
Authors
Caroline R. Van Hemert, John M. Pearce, Karen Oakley, Mary E. Whalen
By
Ecosystems Mission Area, Alaska Science Center

Evidence that life history characteristics of wild birds influence infection rates and exposure to influenza A viruses Evidence that life history characteristics of wild birds influence infection rates and exposure to influenza A viruses

We report on life history characteristics, temporal, and age-related effects influencing the frequency of occurrence of avian influenza (AI) viruses in four species of migratory geese breeding on the Yukon-Kuskokwim Delta, Alaska. Emperor geese (Chen canagica), cackling geese (Branta hutchinsii), greater white-fronted geese (Anser albifrons), and black brant (Branta bernicla), were all...
Authors
Craig R. Ely, Jeffrey S. Hall, Joel A. Schmutz, John M. Pearce, John Terenzi, James S. Sedinger, S. Ip
By
Ecosystems Mission Area, Alaska Science Center, National Wildlife Health Center

Changing Arctic ecosystems - measuring and forecasting the response of Alaska's terrestrial ecosystem to a warming climate Changing Arctic ecosystems - measuring and forecasting the response of Alaska's terrestrial ecosystem to a warming climate

The Arctic Coastal Plain of northern Alaska is a complex landscape of lakes, streams, and wetlands scattered across low relief tundra that is underlain by permafrost. This region of the Arctic has experienced a warming trend over the past three decades, leading to thawing of on-shore permafrost and the disappearance of sea ice at an unprecedented rate. The loss of sea ice has increased...
Authors
John M. Pearce, Anthony R. DeGange, Paul L. Flint, Tom F. Fondell, David D. Gustine, Leslie E. Holland-Bartels, Andrew G. Hope, Jerry W. Hupp, Joshua C. Koch, Joel A. Schmutz, Sandra L. Talbot, David H. Ward, Mary E. Whalen
By
Ecosystems Mission Area, Alaska Science Center

Molecular detection of hematozoa infections in tundra swans relative to migration patterns and ecological conditions at breeding grounds Molecular detection of hematozoa infections in tundra swans relative to migration patterns and ecological conditions at breeding grounds

Tundra swans (Cygnus columbianus) are broadly distributed in North America, use a wide variety of habitats, and exhibit diverse migration strategies. We investigated patterns of hematozoa infection in three populations of tundra swans that breed in Alaska using satellite tracking to infer host movement and molecular techniques to assess the prevalence and genetic diversity of parasites...
Authors
Andrew M. Ramey, Craig R. Ely, Joel A. Schmutz, John M. Pearce, Darryl J. Heard
By
Ecosystems Mission Area, Alaska Science Center
Was this page helpful?