John M. Pearce, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 42
Exploring Alaska Through Our Science
The USGS conducts scientific research for the Department of the Interior (DOI). The Alaska Science Center (ASC) provides objective and timely data, information, and research findings to Federal, State, and local resource managers and the public but has no regulatory authority. Our science helps support sound decisions regarding natural resources, natural hazards, and ecosystems in Alaska and...
USGS Alaska Q&A Series
USGS scientists and collaborators talk about their work in Alaska through a series of Questions and Answers (Q&As). The links below contain interviews, photos, and other information about the work and collaborations of the USGS Alaska Science Center.
Outer Continental Shelf Program
This is a nation-wide collaborative program, supported by the USGS Ecosystems Mission Area, through which USGS and Bureau of Ocean Energy Management staff address priority research needs identified by the Bureau of Ocean Energy Management. On this page, we highlight research taking place in Alaska as part of this program.
Science Support Program and Quick Response Program
This is a nation-wide collaborative program, supported by the USGS Ecosystems Mission Area, through which USGS and U.S. Fish and Wildlife Service staff address priority research needs identified by the U.S. Fish and Wildlife Service. On this page, we highlight research taking place in Alaska as part of this program.
Pacific Marine Heatwave
The USGS conducts research on marine wildlife, habitats, and ecosystem processes to provide science to inform our partners as they make decisions relative to species status, resource use, and human activities. These studies examine impacts of severe heatwaves on marine ecosystems of the North Pacific.
Terrestrial Ecosystems
The USGS conducts research on trust Department of Interior migratory bird and mammal species and their habitats to inform agencies such as the US Fish and Wildlife Service, Bureau of Land Management and National Park Service in their natural resource management decisions.
Filter Total Items: 29
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Filter Total Items: 80
Changing Arctic ecosystems: sea ice decline, permafrost thaw, and benefits for geese Changing Arctic ecosystems: sea ice decline, permafrost thaw, and benefits for geese
Through the Changing Arctic Ecosystems (CAE) initiative, the U.S. Geological Survey (USGS) strives to inform resource management decisions for Arctic Alaska by providing scientific information on current and future ecosystem response to a warming climate. A key area for the USGS CAE initiative has been the Arctic Coastal Plain of northern Alaska. This region has experienced a warming...
Authors
Paul L. Flint, Mary E. Whalen, John M. Pearce
Historical and contemporary imagery to assess ecosystem change on the Arctic coastal plain of northern Alaska Historical and contemporary imagery to assess ecosystem change on the Arctic coastal plain of northern Alaska
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 unprecedented rates. The U.S. Geological Survey’s (USGS)...
Authors
Ken D. Tape, John M. Pearce, Dennis H. Walworth, Brandt W. Meixell, Tom F. Fondell, David D. Gustine, Paul L. Flint, Jerry W. Hupp, Joel A. Schmutz, David H. Ward
Comparative population structure of cavity-nesting sea ducks Comparative population structure of cavity-nesting sea ducks
A growing collection of mtDNA genetic information from waterfowl species across North America suggests that larger-bodied cavity-nesting species exhibit greater levels of population differentiation than smaller-bodied congeners. Although little is known about nest-cavity availability for these species, one hypothesis to explain differences in population structure is reduced dispersal...
Authors
John M. Pearce, John M. Eadie, Jean-Pierre L. Savard, Thomas K. Christensen, James Berdeen, Eric J. Taylor, Sean Boyd, Arni Einarsson
Evidence of low genetic variation and rare alleles in a bottlenecked endangered island endemic, the Lasan Teal (Anas laysanensis) Evidence of low genetic variation and rare alleles in a bottlenecked endangered island endemic, the Lasan Teal (Anas laysanensis)
Genetic diversity is assumed to reflect the evolutionary potential and adaptability of populations, and thus quantifying the genetic diversity of endangered species is useful for recovery programs. In particular, if conservation strategies include reintroductions, periodic genetic assessments are useful to evaluate whether management efforts have resulted in the maximization or loss of...
Authors
Michelle H. Reynolds, John M. Pearce, Philip Lavretsky, Peters Jeffrey L, Karen Courtot, Pedro P. Seixas
Wildlife health in a rapidly changing North: focus on avian disease Wildlife health in a rapidly changing North: focus on avian disease
Climate-related environmental changes have increasingly been linked to emerging infectious diseases in wildlife. The Arctic is facing a major ecological transition that is expected to substantially affect animal and human health. Changes in phenology or environmental conditions that result from climate warming may promote novel species assemblages as host and pathogen ranges expand to...
Authors
Caroline R. Van Hemert, John M. Pearce, Colleen M. Handel
Satellite tracking of the migration of Whooper Swans Cygnus cygnus wintering in Japan Satellite tracking of the migration of Whooper Swans Cygnus cygnus wintering in Japan
We satellite-tracked Whooper Swans Cygnus cygnus wintering in northern Japan to document their migration routes and timing, and to identify breeding areas. From 47 swans that we marked at Lake Izunuma-Uchinuma, Miyagi Prefecture, northeast Honshu, and at Lake Kussharo, east Hokkaido, we observed 57 spring and 33 autumn migrations from 2009-2012. In spring, swans migrated north along...
Authors
Tetsuo Shimada, Noriyuki M. Yamaguchi, N. Hijikata, Emiko N. Hiraoka, Jerry W. Hupp, Paul L. Flint, Ken-ichi Tokita, Go Fujita, Kiyoshi Uchida, F. Sato, Masayuki Kurechi, John M. Pearce, Andrew M. Ramey, Hiroyoshi Higuchi
Science and Products
Filter Total Items: 42
Exploring Alaska Through Our Science
The USGS conducts scientific research for the Department of the Interior (DOI). The Alaska Science Center (ASC) provides objective and timely data, information, and research findings to Federal, State, and local resource managers and the public but has no regulatory authority. Our science helps support sound decisions regarding natural resources, natural hazards, and ecosystems in Alaska and...
USGS Alaska Q&A Series
USGS scientists and collaborators talk about their work in Alaska through a series of Questions and Answers (Q&As). The links below contain interviews, photos, and other information about the work and collaborations of the USGS Alaska Science Center.
Outer Continental Shelf Program
This is a nation-wide collaborative program, supported by the USGS Ecosystems Mission Area, through which USGS and Bureau of Ocean Energy Management staff address priority research needs identified by the Bureau of Ocean Energy Management. On this page, we highlight research taking place in Alaska as part of this program.
Science Support Program and Quick Response Program
This is a nation-wide collaborative program, supported by the USGS Ecosystems Mission Area, through which USGS and U.S. Fish and Wildlife Service staff address priority research needs identified by the U.S. Fish and Wildlife Service. On this page, we highlight research taking place in Alaska as part of this program.
Pacific Marine Heatwave
The USGS conducts research on marine wildlife, habitats, and ecosystem processes to provide science to inform our partners as they make decisions relative to species status, resource use, and human activities. These studies examine impacts of severe heatwaves on marine ecosystems of the North Pacific.
Terrestrial Ecosystems
The USGS conducts research on trust Department of Interior migratory bird and mammal species and their habitats to inform agencies such as the US Fish and Wildlife Service, Bureau of Land Management and National Park Service in their natural resource management decisions.
Filter Total Items: 29
No results found.
Filter Total Items: 80
Changing Arctic ecosystems: sea ice decline, permafrost thaw, and benefits for geese Changing Arctic ecosystems: sea ice decline, permafrost thaw, and benefits for geese
Through the Changing Arctic Ecosystems (CAE) initiative, the U.S. Geological Survey (USGS) strives to inform resource management decisions for Arctic Alaska by providing scientific information on current and future ecosystem response to a warming climate. A key area for the USGS CAE initiative has been the Arctic Coastal Plain of northern Alaska. This region has experienced a warming...
Authors
Paul L. Flint, Mary E. Whalen, John M. Pearce
Historical and contemporary imagery to assess ecosystem change on the Arctic coastal plain of northern Alaska Historical and contemporary imagery to assess ecosystem change on the Arctic coastal plain of northern Alaska
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 unprecedented rates. The U.S. Geological Survey’s (USGS)...
Authors
Ken D. Tape, John M. Pearce, Dennis H. Walworth, Brandt W. Meixell, Tom F. Fondell, David D. Gustine, Paul L. Flint, Jerry W. Hupp, Joel A. Schmutz, David H. Ward
Comparative population structure of cavity-nesting sea ducks Comparative population structure of cavity-nesting sea ducks
A growing collection of mtDNA genetic information from waterfowl species across North America suggests that larger-bodied cavity-nesting species exhibit greater levels of population differentiation than smaller-bodied congeners. Although little is known about nest-cavity availability for these species, one hypothesis to explain differences in population structure is reduced dispersal...
Authors
John M. Pearce, John M. Eadie, Jean-Pierre L. Savard, Thomas K. Christensen, James Berdeen, Eric J. Taylor, Sean Boyd, Arni Einarsson
Evidence of low genetic variation and rare alleles in a bottlenecked endangered island endemic, the Lasan Teal (Anas laysanensis) Evidence of low genetic variation and rare alleles in a bottlenecked endangered island endemic, the Lasan Teal (Anas laysanensis)
Genetic diversity is assumed to reflect the evolutionary potential and adaptability of populations, and thus quantifying the genetic diversity of endangered species is useful for recovery programs. In particular, if conservation strategies include reintroductions, periodic genetic assessments are useful to evaluate whether management efforts have resulted in the maximization or loss of...
Authors
Michelle H. Reynolds, John M. Pearce, Philip Lavretsky, Peters Jeffrey L, Karen Courtot, Pedro P. Seixas
Wildlife health in a rapidly changing North: focus on avian disease Wildlife health in a rapidly changing North: focus on avian disease
Climate-related environmental changes have increasingly been linked to emerging infectious diseases in wildlife. The Arctic is facing a major ecological transition that is expected to substantially affect animal and human health. Changes in phenology or environmental conditions that result from climate warming may promote novel species assemblages as host and pathogen ranges expand to...
Authors
Caroline R. Van Hemert, John M. Pearce, Colleen M. Handel
Satellite tracking of the migration of Whooper Swans Cygnus cygnus wintering in Japan Satellite tracking of the migration of Whooper Swans Cygnus cygnus wintering in Japan
We satellite-tracked Whooper Swans Cygnus cygnus wintering in northern Japan to document their migration routes and timing, and to identify breeding areas. From 47 swans that we marked at Lake Izunuma-Uchinuma, Miyagi Prefecture, northeast Honshu, and at Lake Kussharo, east Hokkaido, we observed 57 spring and 33 autumn migrations from 2009-2012. In spring, swans migrated north along...
Authors
Tetsuo Shimada, Noriyuki M. Yamaguchi, N. Hijikata, Emiko N. Hiraoka, Jerry W. Hupp, Paul L. Flint, Ken-ichi Tokita, Go Fujita, Kiyoshi Uchida, F. Sato, Masayuki Kurechi, John M. Pearce, Andrew M. Ramey, Hiroyoshi Higuchi