Annika Walters, PhD (Former Employee)
Science and Products
Filter Total Items: 72
Population connectivity and genetic structure of burbot (Lota lota) populations in the Wind River Basin, Wyoming Population connectivity and genetic structure of burbot (Lota lota) populations in the Wind River Basin, Wyoming
Burbot (Lota lota) occur in the Wind River Basin in central Wyoming, USA, at the southwestern extreme of the species’ native range in North America. The most stable and successful of these populations occur in six glacially carved mountain lakes on three different tributary streams and one large main stem impoundment (Boysen Reservoir) downstream from the tributary populations. Burbot...
Authors
Zachary E. Underwood, Elizabeth G. Mandeville, Annika W. Walters
Fish assemblage shifts in the Powder River of Wyoming: an unregulated prairie river system previously considered to be relatively pristine. Fish assemblage shifts in the Powder River of Wyoming: an unregulated prairie river system previously considered to be relatively pristine.
Wyoming’s Powder River is considered an example of a pristine prairie river system. While the river hosts a largely native fish assemblage and remains unimpounded over its 1,146-km course to the Yellowstone River confluence, the hydrologic regime has been altered through water diversion for agriculture and natural gas extraction and there has been limited study of fish assemblage...
Authors
Anna C. Senecal, Annika W. Walters, Wayne A. Hubert
Density of river otters (Lontra canadensis) in relation to energy development in the Green River Basin, Wyoming Density of river otters (Lontra canadensis) in relation to energy development in the Green River Basin, Wyoming
Exploration and extraction of oil and natural gas have increased in recent years and are expected to expand in the future. Reduction in water quality from energy extraction may negatively affect water supply for agriculture and urban use within catchments as well as down river. We used non-invasive genetic techniques and capture–recapture modeling to estimate the abundance and density of...
Authors
B.L. Godwin, S.E. Albeke, H.L. Bergman, Annika W. Walters, M. Ben-David
Landscape-scale determinants of native and nonnative Great Plains fish distributions Landscape-scale determinants of native and nonnative Great Plains fish distributions
Aim Landscape-scale factors may have differential effects on the distribution of native and non-native fishes and may help explain invasion success and species declines. Location Great Plains, Wyoming, USA Methods We used hierarchical Bayesian mixture models and constrained ordination techniques to evaluate associations between landscape-scale factors on native and non-native fish...
Authors
David R. Stewart, Annika W. Walters, Frank J. Rahel
Stream vulnerability to widespread and emergent stressors: a focus on unconventional oil and gas Stream vulnerability to widespread and emergent stressors: a focus on unconventional oil and gas
Multiple stressors threaten stream physical and biological quality, including elevated nutrients and other contaminants, riparian and in-stream habitat degradation and altered natural flow regime. Unconventional oil and gas (UOG) development is one emerging stressor that spans the U.S. UOG development could alter stream sedimentation, riparian extent and composition, in-stream flow, and...
Authors
Sally Entrekin, Kelly O. Maloney, Katherine E. Kapo, Annika W. Walters, Michelle A. Evans-White, Kenneth M. Klemow
U.S. Geological Survey science for the Wyoming Landscape Conservation Initiative—2014 annual report U.S. Geological Survey science for the Wyoming Landscape Conservation Initiative—2014 annual report
This is the seventh report produced by the U.S. Geological Survey (USGS) for the Wyoming Landscape Conservation Initiative (WLCI) to detail annual activities conducted by the USGS for addressing specific management needs identified by WLCI partners. In FY2014, there were 26 projects, including a new one that was completed, two others that were also completed, and several that entered new...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Timothy J. Assal, Timothy T. Bartos, Laura R Biewick, Gregory K. Boughton, Anna D. Chalfoun, Geneva W. Chong, Marie K. Dematatis, Cheryl A. Eddy-Miller, Steven L. Garman, Steve Germaine, Collin G. Homer, Christopher Huber, Matthew J. Kauffman, Natalie Latysh, Daniel J. Manier, Cynthia P. Melcher, Alexander Miller, Kirk A. Miller, Edward M. Olexa, Spencer Schell, Annika W. Walters, Anna B. Wilson, Teal B. Wyckoff
Linking environmental variability to population and community dynamics Linking environmental variability to population and community dynamics
Linking population and community responses to environmental variability lies at the heart of ecology, yet methodological approaches vary and existence of broad patterns spanning taxonomic groups remains unclear. We review the characteristics of environmental and biological variability. Classic approaches to link environmental variability to population and community variability are...
Authors
Jelena H. Pantel, Daniel E. Pendleton, Annika W. Walters, Lauren A. Rogers
U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative - 2013 Annual Report U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative - 2013 Annual Report
This is the sixth report produced by the U.S. Geological Survey (USGS) for the Wyoming Landscape Conservation Initiative (WLCI) to detail annual activities conducted by USGS for addressing specific management needs identified by WLCI partners. In FY2013, there were 25 ongoing and new projects conducted by the USGS. These projects fall into 8 major categories: (1) synthesizing and...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Timothy J. Assal, Carleton R. Bern, Laura R Biewick, Gregory K. Boughton, Anna D. Chalfoun, Geneva W. Chong, Marie K. Dematatis, Bradley C. Fedy, Steven L. Garman, Steve Germaine, Matthew G. Hethcoat, Collin G. Homer, Christopher Huber, Matthew J. Kauffman, Natalie Latysh, Daniel J. Manier, Cynthia P. Melcher, Kirk A. Miller, Christopher J. Potter, Spencer Schell, Michael J. Sweat, Annika W. Walters, Anna B. Wilson
The importance of context dependency for understanding the effects of low flow events on fish The importance of context dependency for understanding the effects of low flow events on fish
The natural hydrology of streams and rivers has been extensively altered by dam construction, water diversion, and climate change. An increased frequency of low-flow events will affect fish by changing habitat availability, resource availability, and reproductive cues. I reviewed the literature to characterize the approaches taken to assess low-flow events and fish, the main effects of...
Authors
Annika W. Walters
Wyoming Basin Rapid Ecoregional Assessment: Work Plan Wyoming Basin Rapid Ecoregional Assessment: Work Plan
The overall goal of the Rapid Ecoregional Assessments (REAs) being conducted for the Bureau of Land Management (BLM) is to provide information that supports regional planning and analysis for the management of ecological resources. The REA provides an assessment of baseline ecological conditions, an evaluation of current risks from drivers of ecosystem change, and a predictive capacity...
Authors
Natasha B. Carr, Steven L. Garman, Annika Walters, Andrea Ray, Cynthia P. Melcher, Jeff S. Wesner, Michael S. O’Donnell, Kirk R. Sherrill, Nils C. Babel, Zachary H. Bowen
Species- and community-level responses combine to drive phenology of lake phytoplankton Species- and community-level responses combine to drive phenology of lake phytoplankton
Global change is leading to shifts in the seasonal timing of growth and maturation for primary producers. Remote sensing is increasingly used to measure the timing of primary production in both aquatic and terrestrial ecosystems, but there is often a poor correlation between these results and direct observations of life-history responses of individual species. One explanation may be that...
Authors
Annika Walters, Maria de los Angeles Gonzalez Sagrario, Daniel E. Schindler
The density dilemma: limitations on juvenile production in threatened salmon populations The density dilemma: limitations on juvenile production in threatened salmon populations
Density-dependent processes have repeatedly been shown to have a central role in salmonid population dynamics, but are often assumed to be negligible for populations at low abundances relative to historical records. Density dependence has been observed in overall spring/summer Snake River Chinook salmon Oncorhynchus tshawytscha production, but it is not clear how patterns observed at the...
Authors
Annika W. Walters, Timothy Copeland, David A. Venditti
Science and Products
Filter Total Items: 72
Population connectivity and genetic structure of burbot (Lota lota) populations in the Wind River Basin, Wyoming Population connectivity and genetic structure of burbot (Lota lota) populations in the Wind River Basin, Wyoming
Burbot (Lota lota) occur in the Wind River Basin in central Wyoming, USA, at the southwestern extreme of the species’ native range in North America. The most stable and successful of these populations occur in six glacially carved mountain lakes on three different tributary streams and one large main stem impoundment (Boysen Reservoir) downstream from the tributary populations. Burbot...
Authors
Zachary E. Underwood, Elizabeth G. Mandeville, Annika W. Walters
Fish assemblage shifts in the Powder River of Wyoming: an unregulated prairie river system previously considered to be relatively pristine. Fish assemblage shifts in the Powder River of Wyoming: an unregulated prairie river system previously considered to be relatively pristine.
Wyoming’s Powder River is considered an example of a pristine prairie river system. While the river hosts a largely native fish assemblage and remains unimpounded over its 1,146-km course to the Yellowstone River confluence, the hydrologic regime has been altered through water diversion for agriculture and natural gas extraction and there has been limited study of fish assemblage...
Authors
Anna C. Senecal, Annika W. Walters, Wayne A. Hubert
Density of river otters (Lontra canadensis) in relation to energy development in the Green River Basin, Wyoming Density of river otters (Lontra canadensis) in relation to energy development in the Green River Basin, Wyoming
Exploration and extraction of oil and natural gas have increased in recent years and are expected to expand in the future. Reduction in water quality from energy extraction may negatively affect water supply for agriculture and urban use within catchments as well as down river. We used non-invasive genetic techniques and capture–recapture modeling to estimate the abundance and density of...
Authors
B.L. Godwin, S.E. Albeke, H.L. Bergman, Annika W. Walters, M. Ben-David
Landscape-scale determinants of native and nonnative Great Plains fish distributions Landscape-scale determinants of native and nonnative Great Plains fish distributions
Aim Landscape-scale factors may have differential effects on the distribution of native and non-native fishes and may help explain invasion success and species declines. Location Great Plains, Wyoming, USA Methods We used hierarchical Bayesian mixture models and constrained ordination techniques to evaluate associations between landscape-scale factors on native and non-native fish...
Authors
David R. Stewart, Annika W. Walters, Frank J. Rahel
Stream vulnerability to widespread and emergent stressors: a focus on unconventional oil and gas Stream vulnerability to widespread and emergent stressors: a focus on unconventional oil and gas
Multiple stressors threaten stream physical and biological quality, including elevated nutrients and other contaminants, riparian and in-stream habitat degradation and altered natural flow regime. Unconventional oil and gas (UOG) development is one emerging stressor that spans the U.S. UOG development could alter stream sedimentation, riparian extent and composition, in-stream flow, and...
Authors
Sally Entrekin, Kelly O. Maloney, Katherine E. Kapo, Annika W. Walters, Michelle A. Evans-White, Kenneth M. Klemow
U.S. Geological Survey science for the Wyoming Landscape Conservation Initiative—2014 annual report U.S. Geological Survey science for the Wyoming Landscape Conservation Initiative—2014 annual report
This is the seventh report produced by the U.S. Geological Survey (USGS) for the Wyoming Landscape Conservation Initiative (WLCI) to detail annual activities conducted by the USGS for addressing specific management needs identified by WLCI partners. In FY2014, there were 26 projects, including a new one that was completed, two others that were also completed, and several that entered new...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Timothy J. Assal, Timothy T. Bartos, Laura R Biewick, Gregory K. Boughton, Anna D. Chalfoun, Geneva W. Chong, Marie K. Dematatis, Cheryl A. Eddy-Miller, Steven L. Garman, Steve Germaine, Collin G. Homer, Christopher Huber, Matthew J. Kauffman, Natalie Latysh, Daniel J. Manier, Cynthia P. Melcher, Alexander Miller, Kirk A. Miller, Edward M. Olexa, Spencer Schell, Annika W. Walters, Anna B. Wilson, Teal B. Wyckoff
Linking environmental variability to population and community dynamics Linking environmental variability to population and community dynamics
Linking population and community responses to environmental variability lies at the heart of ecology, yet methodological approaches vary and existence of broad patterns spanning taxonomic groups remains unclear. We review the characteristics of environmental and biological variability. Classic approaches to link environmental variability to population and community variability are...
Authors
Jelena H. Pantel, Daniel E. Pendleton, Annika W. Walters, Lauren A. Rogers
U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative - 2013 Annual Report U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative - 2013 Annual Report
This is the sixth report produced by the U.S. Geological Survey (USGS) for the Wyoming Landscape Conservation Initiative (WLCI) to detail annual activities conducted by USGS for addressing specific management needs identified by WLCI partners. In FY2013, there were 25 ongoing and new projects conducted by the USGS. These projects fall into 8 major categories: (1) synthesizing and...
Authors
Zachary H. Bowen, Cameron L. Aldridge, Patrick J. Anderson, Timothy J. Assal, Carleton R. Bern, Laura R Biewick, Gregory K. Boughton, Anna D. Chalfoun, Geneva W. Chong, Marie K. Dematatis, Bradley C. Fedy, Steven L. Garman, Steve Germaine, Matthew G. Hethcoat, Collin G. Homer, Christopher Huber, Matthew J. Kauffman, Natalie Latysh, Daniel J. Manier, Cynthia P. Melcher, Kirk A. Miller, Christopher J. Potter, Spencer Schell, Michael J. Sweat, Annika W. Walters, Anna B. Wilson
The importance of context dependency for understanding the effects of low flow events on fish The importance of context dependency for understanding the effects of low flow events on fish
The natural hydrology of streams and rivers has been extensively altered by dam construction, water diversion, and climate change. An increased frequency of low-flow events will affect fish by changing habitat availability, resource availability, and reproductive cues. I reviewed the literature to characterize the approaches taken to assess low-flow events and fish, the main effects of...
Authors
Annika W. Walters
Wyoming Basin Rapid Ecoregional Assessment: Work Plan Wyoming Basin Rapid Ecoregional Assessment: Work Plan
The overall goal of the Rapid Ecoregional Assessments (REAs) being conducted for the Bureau of Land Management (BLM) is to provide information that supports regional planning and analysis for the management of ecological resources. The REA provides an assessment of baseline ecological conditions, an evaluation of current risks from drivers of ecosystem change, and a predictive capacity...
Authors
Natasha B. Carr, Steven L. Garman, Annika Walters, Andrea Ray, Cynthia P. Melcher, Jeff S. Wesner, Michael S. O’Donnell, Kirk R. Sherrill, Nils C. Babel, Zachary H. Bowen
Species- and community-level responses combine to drive phenology of lake phytoplankton Species- and community-level responses combine to drive phenology of lake phytoplankton
Global change is leading to shifts in the seasonal timing of growth and maturation for primary producers. Remote sensing is increasingly used to measure the timing of primary production in both aquatic and terrestrial ecosystems, but there is often a poor correlation between these results and direct observations of life-history responses of individual species. One explanation may be that...
Authors
Annika Walters, Maria de los Angeles Gonzalez Sagrario, Daniel E. Schindler
The density dilemma: limitations on juvenile production in threatened salmon populations The density dilemma: limitations on juvenile production in threatened salmon populations
Density-dependent processes have repeatedly been shown to have a central role in salmonid population dynamics, but are often assumed to be negligible for populations at low abundances relative to historical records. Density dependence has been observed in overall spring/summer Snake River Chinook salmon Oncorhynchus tshawytscha production, but it is not clear how patterns observed at the...
Authors
Annika W. Walters, Timothy Copeland, David A. Venditti