Annika Walters, PhD (Former Employee)
Science and Products
Filter Total Items: 72
Biogeochemical and community ecology responses to the wetting of non-perennial streams Biogeochemical and community ecology responses to the wetting of non-perennial streams
Transitions between dry and wet hydrologic states are the defining characteristic of non-perennial rivers and streams, which constitute the majority of the global river network. Although past work has focused on stream drying characteristics, there has been less focus on how hydrology, ecology and biogeochemistry respond and interact during stream wetting. Wetting mechanisms are highly...
Authors
Adam N. Price, Margaret Ann Zimmer, Anna J. Bergstrom, Amy J Burgin, Erin C. Seybold, Corey A. Krabbenhoft, Sam Zipper, Michelle H. Busch, Walter K. Dodds, Annika W. Walters, Jane S. Rogosch, Rachel Stubbington, Richard H Walker, James C. Stegen, Thibault Datry, Mathis L. Messager, Julian Olden, Sarah E Godsey, Margaret Shanafield, David E. Lytle, Ryan Burrows, Kendra E. Kaiser, George H. Allen, Meryl C. Mims, Jonathan D. Tonkin, Michael Bogan, John Christopher Hammond, Kate Boersma, Allison Myers-Pigg, Amanda DelVecchia, Daniel C. Allen, Songyan Yu, Adam Ward
Refuge identification as a climate adaptation strategy to promote fish persistence during drought Refuge identification as a climate adaptation strategy to promote fish persistence during drought
Climate change is leading to global increases in extreme events, such as drought, that threaten the persistence of freshwater biodiversity. Identification and management of drought refuges, areas that promote resistance and resilience to drought, will be critical for preserving and recovering aquatic biodiversity in the face of climate change and increasing human water use. Although...
Authors
Annika W. Walters, Niall G. Clancy, Thomas P. Archdeacon, Songyan Yu, Jane S. Rogosch, E.A. Reiger
Functional turnover in a prairie-river fish community over 130 years Functional turnover in a prairie-river fish community over 130 years
Objective In many Great Plains rivers, functional turnover—the change in proportional dominance of members in biological communities that fill certain ecological roles—has occurred due to impoundment and habitat alteration. The Powder River of Montana and Wyoming remains one of the few unregulated prairie rivers, but long-term monitoring is limited, so we analyzed changes over time at...
Authors
Niall G. Clancy, Jonathan A. McFarland, Megan G. Ahern, Annika W. Walters
Seasonal movements between mainstem and tributaries may facilitate the persistence of Roundtail Chub and Flannelmouth Sucker within an altered stream system Seasonal movements between mainstem and tributaries may facilitate the persistence of Roundtail Chub and Flannelmouth Sucker within an altered stream system
Objective Movement enables animals to complete their life history by responding to changing environmental conditions. Linking movement behaviors to life history characteristics can allow more targeted management applications for declining native fish populations. We identified seasonal movement patterns of Roundtail Chub Gila robusta and Flannelmouth Sucker Catostomus latipinnis, two...
Authors
Alissa C. Magruder, Gabriel M. Barrile, Stephen F. Siddons, John D. Walrath, Annika W. Walters
Influence of dams on sauger population structure and hybridization with introduced walleye Influence of dams on sauger population structure and hybridization with introduced walleye
Dams have negatively affected freshwater biodiversity throughout the world. These negative effects tend to be exacerbated for aquatic taxa with migratory life histories, and for taxa whose habitat is fundamentally altered by the formation of large reservoirs. Sauger (Sander candadensis; Percidae), large-bodied migratory fishes native to North America, have seen population declines over...
Authors
William C. Rosenthal, Elizabeth G. Mandeville, Ashleigh Pilkerton, Paul C. Gerrity, Joseph A. Skorupski, Annika W. Walters, Catherine E. Wagner
A metasystem approach to designing environmental flows A metasystem approach to designing environmental flows
Accelerating the design and implementation of environmental flows (e-flows) is essential to curb the rapid, ongoing loss of freshwater biodiversity and the benefits it provides to people. However, the effectiveness of e-flow programs may be limited by a singular focus on ensuring adequate flow conditions at local sites, which overlooks the role of other ecological processes. Recent...
Authors
Mathis L. Messager, Julian D. Olden, Jonathan Tonkin, Rachel Stubbington, Jane S. Rogosch, Michelle H. Busch, Chelsea J. Little, Annika W. Walters, Carla L. Atkinson, Margaret Shanafield, Songyan Yu, Kate Boersma, Dave Lytle, Richard H. Walker, Ryan M. Burrows, Thibault Datry
Timing of reproduction underlies fitness tradeoffs for a salmonid fish Timing of reproduction underlies fitness tradeoffs for a salmonid fish
Life history diversity is generated and maintained in part by density-dependent fitness tradeoffs that inhibit a single trait value from reaching fixation. While central to our understanding of evolution, demonstrating density dependence in the strength of fitness tradeoffs is difficult in natural systems. The timing of reproduction is a key life history trait that determines access to...
Authors
Jeffrey R Baldock, Robert Al-Chokhachy, Matthew R. Campbell, Annika W. Walters
Winners and losers over a ½ century of change in crayfish assemblages of Wyoming, USA Winners and losers over a ½ century of change in crayfish assemblages of Wyoming, USA
Crayfish have experienced extensive assemblage reorganization as a result of global change, with some species becoming globally invasive and others becoming rare or extinct. We combined historical and contemporary sampling data to determine temporal trends of crayfish assemblages of Wyoming, USA, identifying winners and losers over a ½ century of change (1969–2020). We first documented...
Authors
Braxton Newkirk, Eric R. Larson, Andrew D. Walker, Annika W. Walters
Invasive Brook Stickleback Culaea inconstans occurrence, habitat drivers, and spatial overlap with native fishes in Wyoming, USA Invasive Brook Stickleback Culaea inconstans occurrence, habitat drivers, and spatial overlap with native fishes in Wyoming, USA
A central focus of modern fisheries management is eradicating invaders that threaten imperiled native fishes. However, vast landscapes and limited funding and personnel resources demand a prioritized approach to management. Brook Stickleback Culaea inconstans (Kirtland, 1840) is an aquatic invasive species in Wyoming, USA, that may pose a risk to native biodiversity. Our aim was to...
Authors
Jacob S. Ruthvena, Josh Leonard, Annika W. Walters
Parallel shifts in trout feeding morphology suggest rapid adaptation to alpine lake environments Parallel shifts in trout feeding morphology suggest rapid adaptation to alpine lake environments
Eco-evolutionary interactions following ecosystem change provide critical insight into the ability of organisms to adapt to shifting resource landscapes. Here we explore evidence for the rapid parallel evolution of trout feeding morphology following eco-evolutionary interactions with zooplankton in alpine lakes stocked at different points in time in the Wind River Range (Wyoming, USA)...
Authors
Lucia L. Combrink, William C. Rosenthal, Lindsey J. Boyle, Jessica A. Rick, Amy C Krist, Elizabeth G. Mandeville, Annika W. Walters, Catherine E. Wagner
Invasive Brook Stickleback Culaea inconstans minimally alters the trophic ecology of four native fishes in Wyoming, USA Invasive Brook Stickleback Culaea inconstans minimally alters the trophic ecology of four native fishes in Wyoming, USA
Invasive species introductions are a primary threat facing populations of native freshwater fishes. There are multiple mechanisms by which an invader can affect native species, with competition for food resources being one mechanism that can lead to declines in the distribution and abundance of native species. Invaders that are trophic generalists may cause shifts in the trophic ecology...
Authors
Jacob S. Ruthvena, Annika W. Walters
Redd superimposition mediates the accuracy, precision, and significance of redd counts for cutthroat trout Redd superimposition mediates the accuracy, precision, and significance of redd counts for cutthroat trout
Redd counts are commonly applied to estimate spawning population size for salmonids and allow for broad spatial and temporal coverage in monitoring efforts. However, the utility of redd counts may be compromised by observation error, particularly with respect to superimposition, where later arriving spawners construct redds overlapping existing redds. Here, we provide a mechanistic...
Authors
Jeffrey R. Baldock, Robert Al-Chokhachy, Timothy E. Walsworth, Annika W. Walters
Science and Products
Filter Total Items: 72
Biogeochemical and community ecology responses to the wetting of non-perennial streams Biogeochemical and community ecology responses to the wetting of non-perennial streams
Transitions between dry and wet hydrologic states are the defining characteristic of non-perennial rivers and streams, which constitute the majority of the global river network. Although past work has focused on stream drying characteristics, there has been less focus on how hydrology, ecology and biogeochemistry respond and interact during stream wetting. Wetting mechanisms are highly...
Authors
Adam N. Price, Margaret Ann Zimmer, Anna J. Bergstrom, Amy J Burgin, Erin C. Seybold, Corey A. Krabbenhoft, Sam Zipper, Michelle H. Busch, Walter K. Dodds, Annika W. Walters, Jane S. Rogosch, Rachel Stubbington, Richard H Walker, James C. Stegen, Thibault Datry, Mathis L. Messager, Julian Olden, Sarah E Godsey, Margaret Shanafield, David E. Lytle, Ryan Burrows, Kendra E. Kaiser, George H. Allen, Meryl C. Mims, Jonathan D. Tonkin, Michael Bogan, John Christopher Hammond, Kate Boersma, Allison Myers-Pigg, Amanda DelVecchia, Daniel C. Allen, Songyan Yu, Adam Ward
Refuge identification as a climate adaptation strategy to promote fish persistence during drought Refuge identification as a climate adaptation strategy to promote fish persistence during drought
Climate change is leading to global increases in extreme events, such as drought, that threaten the persistence of freshwater biodiversity. Identification and management of drought refuges, areas that promote resistance and resilience to drought, will be critical for preserving and recovering aquatic biodiversity in the face of climate change and increasing human water use. Although...
Authors
Annika W. Walters, Niall G. Clancy, Thomas P. Archdeacon, Songyan Yu, Jane S. Rogosch, E.A. Reiger
Functional turnover in a prairie-river fish community over 130 years Functional turnover in a prairie-river fish community over 130 years
Objective In many Great Plains rivers, functional turnover—the change in proportional dominance of members in biological communities that fill certain ecological roles—has occurred due to impoundment and habitat alteration. The Powder River of Montana and Wyoming remains one of the few unregulated prairie rivers, but long-term monitoring is limited, so we analyzed changes over time at...
Authors
Niall G. Clancy, Jonathan A. McFarland, Megan G. Ahern, Annika W. Walters
Seasonal movements between mainstem and tributaries may facilitate the persistence of Roundtail Chub and Flannelmouth Sucker within an altered stream system Seasonal movements between mainstem and tributaries may facilitate the persistence of Roundtail Chub and Flannelmouth Sucker within an altered stream system
Objective Movement enables animals to complete their life history by responding to changing environmental conditions. Linking movement behaviors to life history characteristics can allow more targeted management applications for declining native fish populations. We identified seasonal movement patterns of Roundtail Chub Gila robusta and Flannelmouth Sucker Catostomus latipinnis, two...
Authors
Alissa C. Magruder, Gabriel M. Barrile, Stephen F. Siddons, John D. Walrath, Annika W. Walters
Influence of dams on sauger population structure and hybridization with introduced walleye Influence of dams on sauger population structure and hybridization with introduced walleye
Dams have negatively affected freshwater biodiversity throughout the world. These negative effects tend to be exacerbated for aquatic taxa with migratory life histories, and for taxa whose habitat is fundamentally altered by the formation of large reservoirs. Sauger (Sander candadensis; Percidae), large-bodied migratory fishes native to North America, have seen population declines over...
Authors
William C. Rosenthal, Elizabeth G. Mandeville, Ashleigh Pilkerton, Paul C. Gerrity, Joseph A. Skorupski, Annika W. Walters, Catherine E. Wagner
A metasystem approach to designing environmental flows A metasystem approach to designing environmental flows
Accelerating the design and implementation of environmental flows (e-flows) is essential to curb the rapid, ongoing loss of freshwater biodiversity and the benefits it provides to people. However, the effectiveness of e-flow programs may be limited by a singular focus on ensuring adequate flow conditions at local sites, which overlooks the role of other ecological processes. Recent...
Authors
Mathis L. Messager, Julian D. Olden, Jonathan Tonkin, Rachel Stubbington, Jane S. Rogosch, Michelle H. Busch, Chelsea J. Little, Annika W. Walters, Carla L. Atkinson, Margaret Shanafield, Songyan Yu, Kate Boersma, Dave Lytle, Richard H. Walker, Ryan M. Burrows, Thibault Datry
Timing of reproduction underlies fitness tradeoffs for a salmonid fish Timing of reproduction underlies fitness tradeoffs for a salmonid fish
Life history diversity is generated and maintained in part by density-dependent fitness tradeoffs that inhibit a single trait value from reaching fixation. While central to our understanding of evolution, demonstrating density dependence in the strength of fitness tradeoffs is difficult in natural systems. The timing of reproduction is a key life history trait that determines access to...
Authors
Jeffrey R Baldock, Robert Al-Chokhachy, Matthew R. Campbell, Annika W. Walters
Winners and losers over a ½ century of change in crayfish assemblages of Wyoming, USA Winners and losers over a ½ century of change in crayfish assemblages of Wyoming, USA
Crayfish have experienced extensive assemblage reorganization as a result of global change, with some species becoming globally invasive and others becoming rare or extinct. We combined historical and contemporary sampling data to determine temporal trends of crayfish assemblages of Wyoming, USA, identifying winners and losers over a ½ century of change (1969–2020). We first documented...
Authors
Braxton Newkirk, Eric R. Larson, Andrew D. Walker, Annika W. Walters
Invasive Brook Stickleback Culaea inconstans occurrence, habitat drivers, and spatial overlap with native fishes in Wyoming, USA Invasive Brook Stickleback Culaea inconstans occurrence, habitat drivers, and spatial overlap with native fishes in Wyoming, USA
A central focus of modern fisheries management is eradicating invaders that threaten imperiled native fishes. However, vast landscapes and limited funding and personnel resources demand a prioritized approach to management. Brook Stickleback Culaea inconstans (Kirtland, 1840) is an aquatic invasive species in Wyoming, USA, that may pose a risk to native biodiversity. Our aim was to...
Authors
Jacob S. Ruthvena, Josh Leonard, Annika W. Walters
Parallel shifts in trout feeding morphology suggest rapid adaptation to alpine lake environments Parallel shifts in trout feeding morphology suggest rapid adaptation to alpine lake environments
Eco-evolutionary interactions following ecosystem change provide critical insight into the ability of organisms to adapt to shifting resource landscapes. Here we explore evidence for the rapid parallel evolution of trout feeding morphology following eco-evolutionary interactions with zooplankton in alpine lakes stocked at different points in time in the Wind River Range (Wyoming, USA)...
Authors
Lucia L. Combrink, William C. Rosenthal, Lindsey J. Boyle, Jessica A. Rick, Amy C Krist, Elizabeth G. Mandeville, Annika W. Walters, Catherine E. Wagner
Invasive Brook Stickleback Culaea inconstans minimally alters the trophic ecology of four native fishes in Wyoming, USA Invasive Brook Stickleback Culaea inconstans minimally alters the trophic ecology of four native fishes in Wyoming, USA
Invasive species introductions are a primary threat facing populations of native freshwater fishes. There are multiple mechanisms by which an invader can affect native species, with competition for food resources being one mechanism that can lead to declines in the distribution and abundance of native species. Invaders that are trophic generalists may cause shifts in the trophic ecology...
Authors
Jacob S. Ruthvena, Annika W. Walters
Redd superimposition mediates the accuracy, precision, and significance of redd counts for cutthroat trout Redd superimposition mediates the accuracy, precision, and significance of redd counts for cutthroat trout
Redd counts are commonly applied to estimate spawning population size for salmonids and allow for broad spatial and temporal coverage in monitoring efforts. However, the utility of redd counts may be compromised by observation error, particularly with respect to superimposition, where later arriving spawners construct redds overlapping existing redds. Here, we provide a mechanistic...
Authors
Jeffrey R. Baldock, Robert Al-Chokhachy, Timothy E. Walsworth, Annika W. Walters