Cory Overton
Cory Overton is a wildlife biologist at the Western Ecological Research Center.
Science and Products
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Waterfowl use of wetland habitats informs wetland restoration designs for multi‐species benefits Waterfowl use of wetland habitats informs wetland restoration designs for multi‐species benefits
Extensive global estuarine wetland losses have prompted intensive focus on restoration of these habitats. In California, substantial tracts of freshwater, brackish and tidal wetlands have been lost. Given the anthropogenic footprint of development and urbanization in this region, wetland restoration must rely on conversion of existing habitat types rather than adding new wetlands. These
Authors
Michael Casazza, Fiona McDuie, Scott Jones, Austen Lorenz, Cory Overton, Julie Yee, Cliff Feldheim, Josh Ackerman, Karen M. Thorne
Ecological insights from three decades of animal movement tracking across a changing Arctic Ecological insights from three decades of animal movement tracking across a changing Arctic
The Arctic is entering a new ecological state, with alarming consequences for humanity. Animal-borne sensors offer a window into these changes. Although substantial animal tracking data from the Arctic and subarctic exist, most are difficult to discover and access. Here, we present the new Arctic Animal Movement Archive (AAMA), a growing collection of more than 200 standardized...
Authors
Sarah C Davidson, Gil Bohrer, Eliezer Gurarie, Scott LaPoint, Peter Mahoney, Natalie Boelman, Jan Eitel, Laura Prugh, Lee Vierling, Jyoti Jennewein, Emma Grier, Ophelie Couriot, Allicia Kelly, Arjan Meddens, Ruth Oliver, Roland Kays, Martin Wikelski, Tomas Aarvak, Josh Ackerman, Monica Almeida e Silva, José A. Alves, Erin Bayne, Bryan Bedrosian, Jerrold Belant, Andrew Berdahl, Alicia Berlin, Dominique Berteaux, Joel Bety, Dmitrij Boiko, Travis Booms, Bridget Borg, Stan Boutin, W. Sean Boyd, Kane Brides, Stephen Brown, Victor Bulyuk, Kurt K Burnham, David Cabot, Michael Casazza, Katherine Christie, Erica Craig, Shanti Davis, Tracy Davison, Dominic Demma, Christopher DeSorbo, Andrew Dixon, Robert Domenech, Gotz Eichhorn, Kyle Elliott, Joseph Evenson, Klaus-Michael Exo, Steven Ferguson, Wolfgang Fiedler, Aaron Fisk, J. Fort, Alastair Franke, Mark Fuller, Stefan Garthe, Gilles Gauthier, Grant Gilchrist, Petr Glazov, Carrie E. Gray, David Gremillet, Larry Griffin, Mike Hallworth, Autumn-Lynn Harrison, Holly Hennin, J Hipfner, James Hodson, James Johnson, Kyle Joly, Kimberly Jones, Todd E. Katzner, Jeff W Kidd, Elly Knight, Michael Kochert, Andrea Kolzsch, Helmut Kruckenberg, Benjamin J Lagassé, Sandra Lai, Jean-François Lamarre, Richard B. Lanctot, Nicholas Larter, A Latham, Christopher Latty, James Lawler, Don-Jean Leandri-Breton, Hansoo Lee, Stephen Lewis, Oliver Love, Jesper Madsen, Mark Maftei, Mark Mallory, Buck Mangipane, Mikhail Markovets, Peter Marra, Rebecca L McGuire, Carol McIntyre, Emily McKinnon, Tricia Miller, Sander Moonen, Tong Mu, Gerhard Muskens, Janet Ng, Kerry Nicholson, Ingar Jostein Oien, Cory Overton, Patricia Owen, Allison Patterson, Aevar Petersen, Ivan Pokrovsky, Luke Powell, Rui Prieto, Petra Quillfeldt, Jennie Rausch, Kelsey Russell, Sarah Saalfeld, Hans Schekkerman, Joel Schmutz, Philipp Schwemmer, Dale Seip, Adam Shreading, Mónica A. Silva, Brian Smith, Fletcher Smith, Jeff Smith, Katherine Snell, Aleksandr Sokolov, Vasiliy Sokolov, Diana Solovyeva, Mathew Sorum, Grigori Tertitski, J. Therrien, Kasper Thorup, T. Lee Tibbitts, Ingrid Tulp, Brian Uher-Koch, Rob van Bemmelen, Steve Van Wilgenburg, Andrew Von Duyke, Jesse Watson, Bryan Watts, Judy Williams, Matthew Wilson, Jay Wright, Michael A Yates, David Yurkowski, Ramūnas Žydelis, Mark Hebblewhite
Gambel’s quail survey variability and implications for survey design in the Mohave Desert Gambel’s quail survey variability and implications for survey design in the Mohave Desert
Careful design of a wildlife population monitoring strategy is necessary to obtain accurate and precise results whether the purpose of the survey is development of habitat suitability models, to estimate abundance, or assess site occupancy. Important characteristics to consider in survey design are sources of elevated variability, particularly within‐subject variability, which increases...
Authors
Cory Overton, Michael Casazza, Daniel Connelley, Scott Gardner
Good prospects: High-resolution telemetry data suggests novel brood-site selection behavior in waterfowl Good prospects: High-resolution telemetry data suggests novel brood-site selection behavior in waterfowl
Breeding success should increase with prior knowledge of the surrounding environment, which is dependent upon an animal’s ability to evaluate habitat. Prospecting for nesting locations and migratory stop-over sites are well-established behaviors among bird species. We assessed whether ducks in Suisun Marsh, California, USA, a brackish marsh, prospect for suitable wetlands in the week...
Authors
Michael Casazza, Fiona McDuie, Austen Lorenz, David Keiter, Julie Yee, Cory Overton, Sarah Peterson, Cliff Feldheim, Joshua T. Ackerman
Moving at the speed of flight: Dabbling duck-movement rates and the relationship with electronic tracking interval Moving at the speed of flight: Dabbling duck-movement rates and the relationship with electronic tracking interval
Context. Effective wildlife management requires information on habitat and resource needs, which can be estimated with movement information and modelling energetics. One necessary component of avian models is flight speeds at multiple temporal scales. Technology has limited the ability to accurately assess flight speeds, leading to estimates of questionable accuracy, many of which have...
Authors
Fiona McDuie, Michael Casazza, David Keiter, Cory Overton, Mark Herzog, Cliff Feldheim, Joshua T. Ackerman
GPS tracking data reveals daily spatio-temporal movement patterns of waterfowl GPS tracking data reveals daily spatio-temporal movement patterns of waterfowl
Background Spatio-temporal patterns of movement can characterize relationships between organisms and their surroundings, and address gaps in our understanding of species ecology, activity budgets, bioenergetics, and habitat resource management. Highly mobile waterfowl, which can exploit resources over large spatial extents, are excellent models to understand relationships between...
Authors
Fiona McDuie, Michael Casazza, Cory Overton, Mark Herzog, C. Hartman, Sarah Peterson, Cliff Feldheim, Joshua T. Ackerman
Rising tides: Assessing habitat vulnerability for an endangered salt marsh-dependent species with sea-level rise Rising tides: Assessing habitat vulnerability for an endangered salt marsh-dependent species with sea-level rise
Salt marsh-dependent species are vulnerable to impacts of sea-level rise (SLR). Site-specific differences in ecogeomorphic processes result in different SLR vulnerabilities. SLR impacts to Ridgway’s rail (Rallus obsoletus) of Southern California (SC) and San Francisco Bay (SF), U.S.A. could foreshadow SLR effects on other coastal endemic species. Salt marsh vulnerabilities to SLR were...
Authors
Jordan A. Rosencranz, Karen M. Thorne, Kevin Buffington, Cory Overton, John Takekawa, Michael Casazza, Jennifer McBroom, Julian Wood, Nadav Nur, Richard Zembal, Glen MacDonald, Richard Ambrose
Duck nest depredation, predator behavior, and female response using video Duck nest depredation, predator behavior, and female response using video
Depredation plays an important role in determining duck nest success and predator and female duck behavior during nest depredation can influence nest fate. We examined depredation of mallard (Anas platyrhynchos) and gadwall (A. strepera) nests in Suisun Marsh, California, USA, in 2015–2016 with continuous infrared video monitoring to identify nest predators and characterize predator and...
Authors
Rebecca Croston, Joshua T. Ackerman, Mark Herzog, Jeffrey Kohl, C. Hartman, Sarah Peterson, Cory Overton, Cliff Feldheim, Michael Casazza
Lessons from the past: isotopes of an endangered rail as indicators of underlying change to tidal marsh habitats Lessons from the past: isotopes of an endangered rail as indicators of underlying change to tidal marsh habitats
Introduction: Tidal marsh systems along the Pacific coast of the United States have experienced substantial stress and loss of area and ecosystem function, which we examined by using the endangered California Ridgway’s Rail, Rallus obsoletus obsoletus (‘rail’) as an indicator of its tidal marsh habitat in the San Francisco Estuary. We organized a collection of historical (1885-1940) and...
Authors
Angela Merritt, Michael Casazza, Cory Overton, John Takekawa, Thomas Hahn, Joshua Hull
Environmental extremes and biotic interactions facilitate depredation of endangered California Ridgway’s rail in a San Francisco Bay tidal marsh Environmental extremes and biotic interactions facilitate depredation of endangered California Ridgway’s rail in a San Francisco Bay tidal marsh
On 23 December 2015 while performing a high tide population survey for endangered Ridgway’s rails (Rallus obsoletus obsoletus; formerly known as the California clapper rail) and other rail species at Arrowhead Marsh, Martin Luther King Jr. Regional Shoreline, Oakland, California, the authors observed a series of species interactions resulting in the predation of a Ridgway’s rail by an...
Authors
Cory Overton, Steven Bobzien, Marcia Grefsrud
A century of landscape disturbance and urbanization of the San Francisco Bay region affects the present-day genetic diversity of the California Ridgway’s rail (Rallus obsoletus obsoletus) A century of landscape disturbance and urbanization of the San Francisco Bay region affects the present-day genetic diversity of the California Ridgway’s rail (Rallus obsoletus obsoletus)
Fragmentation and loss of natural habitat have important consequences for wild populations and can negatively affect long-term viability and resilience to environmental change. Salt marsh obligate species, such as those that occupy the San Francisco Bay Estuary in western North America, occupy already impaired habitats as result of human development and modifications and are highly...
Authors
Dustin Wood, Thuy-Vy Bui, Cory Overton, Amy Vandergast, Michael Casazza, Joshua Hull, John Takekawa
Depredation of the California Ridgway’s rail: Causes and distribution Depredation of the California Ridgway’s rail: Causes and distribution
We studied the causes of mortality for the California Ridgway’s rail at multiple tidal marshes in the San Francisco Bay Estuary, California. We radio-marked 196 individual rails and examined the evidence from 152 recovered California Ridgway’s rail mortalities from our radio-marked sample and determined plausible cause of death from a wide array of evidence. We also included 10...
Authors
Michael Casazza, Cory Overton, Thuy-Vy Bui, John Takekawa, Angela Merritt, J.M. Hull
Science and Products
Filter Total Items: 22
No Result Found
Filter Total Items: 57
Waterfowl use of wetland habitats informs wetland restoration designs for multi‐species benefits Waterfowl use of wetland habitats informs wetland restoration designs for multi‐species benefits
Extensive global estuarine wetland losses have prompted intensive focus on restoration of these habitats. In California, substantial tracts of freshwater, brackish and tidal wetlands have been lost. Given the anthropogenic footprint of development and urbanization in this region, wetland restoration must rely on conversion of existing habitat types rather than adding new wetlands. These
Authors
Michael Casazza, Fiona McDuie, Scott Jones, Austen Lorenz, Cory Overton, Julie Yee, Cliff Feldheim, Josh Ackerman, Karen M. Thorne
Ecological insights from three decades of animal movement tracking across a changing Arctic Ecological insights from three decades of animal movement tracking across a changing Arctic
The Arctic is entering a new ecological state, with alarming consequences for humanity. Animal-borne sensors offer a window into these changes. Although substantial animal tracking data from the Arctic and subarctic exist, most are difficult to discover and access. Here, we present the new Arctic Animal Movement Archive (AAMA), a growing collection of more than 200 standardized...
Authors
Sarah C Davidson, Gil Bohrer, Eliezer Gurarie, Scott LaPoint, Peter Mahoney, Natalie Boelman, Jan Eitel, Laura Prugh, Lee Vierling, Jyoti Jennewein, Emma Grier, Ophelie Couriot, Allicia Kelly, Arjan Meddens, Ruth Oliver, Roland Kays, Martin Wikelski, Tomas Aarvak, Josh Ackerman, Monica Almeida e Silva, José A. Alves, Erin Bayne, Bryan Bedrosian, Jerrold Belant, Andrew Berdahl, Alicia Berlin, Dominique Berteaux, Joel Bety, Dmitrij Boiko, Travis Booms, Bridget Borg, Stan Boutin, W. Sean Boyd, Kane Brides, Stephen Brown, Victor Bulyuk, Kurt K Burnham, David Cabot, Michael Casazza, Katherine Christie, Erica Craig, Shanti Davis, Tracy Davison, Dominic Demma, Christopher DeSorbo, Andrew Dixon, Robert Domenech, Gotz Eichhorn, Kyle Elliott, Joseph Evenson, Klaus-Michael Exo, Steven Ferguson, Wolfgang Fiedler, Aaron Fisk, J. Fort, Alastair Franke, Mark Fuller, Stefan Garthe, Gilles Gauthier, Grant Gilchrist, Petr Glazov, Carrie E. Gray, David Gremillet, Larry Griffin, Mike Hallworth, Autumn-Lynn Harrison, Holly Hennin, J Hipfner, James Hodson, James Johnson, Kyle Joly, Kimberly Jones, Todd E. Katzner, Jeff W Kidd, Elly Knight, Michael Kochert, Andrea Kolzsch, Helmut Kruckenberg, Benjamin J Lagassé, Sandra Lai, Jean-François Lamarre, Richard B. Lanctot, Nicholas Larter, A Latham, Christopher Latty, James Lawler, Don-Jean Leandri-Breton, Hansoo Lee, Stephen Lewis, Oliver Love, Jesper Madsen, Mark Maftei, Mark Mallory, Buck Mangipane, Mikhail Markovets, Peter Marra, Rebecca L McGuire, Carol McIntyre, Emily McKinnon, Tricia Miller, Sander Moonen, Tong Mu, Gerhard Muskens, Janet Ng, Kerry Nicholson, Ingar Jostein Oien, Cory Overton, Patricia Owen, Allison Patterson, Aevar Petersen, Ivan Pokrovsky, Luke Powell, Rui Prieto, Petra Quillfeldt, Jennie Rausch, Kelsey Russell, Sarah Saalfeld, Hans Schekkerman, Joel Schmutz, Philipp Schwemmer, Dale Seip, Adam Shreading, Mónica A. Silva, Brian Smith, Fletcher Smith, Jeff Smith, Katherine Snell, Aleksandr Sokolov, Vasiliy Sokolov, Diana Solovyeva, Mathew Sorum, Grigori Tertitski, J. Therrien, Kasper Thorup, T. Lee Tibbitts, Ingrid Tulp, Brian Uher-Koch, Rob van Bemmelen, Steve Van Wilgenburg, Andrew Von Duyke, Jesse Watson, Bryan Watts, Judy Williams, Matthew Wilson, Jay Wright, Michael A Yates, David Yurkowski, Ramūnas Žydelis, Mark Hebblewhite
Gambel’s quail survey variability and implications for survey design in the Mohave Desert Gambel’s quail survey variability and implications for survey design in the Mohave Desert
Careful design of a wildlife population monitoring strategy is necessary to obtain accurate and precise results whether the purpose of the survey is development of habitat suitability models, to estimate abundance, or assess site occupancy. Important characteristics to consider in survey design are sources of elevated variability, particularly within‐subject variability, which increases...
Authors
Cory Overton, Michael Casazza, Daniel Connelley, Scott Gardner
Good prospects: High-resolution telemetry data suggests novel brood-site selection behavior in waterfowl Good prospects: High-resolution telemetry data suggests novel brood-site selection behavior in waterfowl
Breeding success should increase with prior knowledge of the surrounding environment, which is dependent upon an animal’s ability to evaluate habitat. Prospecting for nesting locations and migratory stop-over sites are well-established behaviors among bird species. We assessed whether ducks in Suisun Marsh, California, USA, a brackish marsh, prospect for suitable wetlands in the week...
Authors
Michael Casazza, Fiona McDuie, Austen Lorenz, David Keiter, Julie Yee, Cory Overton, Sarah Peterson, Cliff Feldheim, Joshua T. Ackerman
Moving at the speed of flight: Dabbling duck-movement rates and the relationship with electronic tracking interval Moving at the speed of flight: Dabbling duck-movement rates and the relationship with electronic tracking interval
Context. Effective wildlife management requires information on habitat and resource needs, which can be estimated with movement information and modelling energetics. One necessary component of avian models is flight speeds at multiple temporal scales. Technology has limited the ability to accurately assess flight speeds, leading to estimates of questionable accuracy, many of which have...
Authors
Fiona McDuie, Michael Casazza, David Keiter, Cory Overton, Mark Herzog, Cliff Feldheim, Joshua T. Ackerman
GPS tracking data reveals daily spatio-temporal movement patterns of waterfowl GPS tracking data reveals daily spatio-temporal movement patterns of waterfowl
Background Spatio-temporal patterns of movement can characterize relationships between organisms and their surroundings, and address gaps in our understanding of species ecology, activity budgets, bioenergetics, and habitat resource management. Highly mobile waterfowl, which can exploit resources over large spatial extents, are excellent models to understand relationships between...
Authors
Fiona McDuie, Michael Casazza, Cory Overton, Mark Herzog, C. Hartman, Sarah Peterson, Cliff Feldheim, Joshua T. Ackerman
Rising tides: Assessing habitat vulnerability for an endangered salt marsh-dependent species with sea-level rise Rising tides: Assessing habitat vulnerability for an endangered salt marsh-dependent species with sea-level rise
Salt marsh-dependent species are vulnerable to impacts of sea-level rise (SLR). Site-specific differences in ecogeomorphic processes result in different SLR vulnerabilities. SLR impacts to Ridgway’s rail (Rallus obsoletus) of Southern California (SC) and San Francisco Bay (SF), U.S.A. could foreshadow SLR effects on other coastal endemic species. Salt marsh vulnerabilities to SLR were...
Authors
Jordan A. Rosencranz, Karen M. Thorne, Kevin Buffington, Cory Overton, John Takekawa, Michael Casazza, Jennifer McBroom, Julian Wood, Nadav Nur, Richard Zembal, Glen MacDonald, Richard Ambrose
Duck nest depredation, predator behavior, and female response using video Duck nest depredation, predator behavior, and female response using video
Depredation plays an important role in determining duck nest success and predator and female duck behavior during nest depredation can influence nest fate. We examined depredation of mallard (Anas platyrhynchos) and gadwall (A. strepera) nests in Suisun Marsh, California, USA, in 2015–2016 with continuous infrared video monitoring to identify nest predators and characterize predator and...
Authors
Rebecca Croston, Joshua T. Ackerman, Mark Herzog, Jeffrey Kohl, C. Hartman, Sarah Peterson, Cory Overton, Cliff Feldheim, Michael Casazza
Lessons from the past: isotopes of an endangered rail as indicators of underlying change to tidal marsh habitats Lessons from the past: isotopes of an endangered rail as indicators of underlying change to tidal marsh habitats
Introduction: Tidal marsh systems along the Pacific coast of the United States have experienced substantial stress and loss of area and ecosystem function, which we examined by using the endangered California Ridgway’s Rail, Rallus obsoletus obsoletus (‘rail’) as an indicator of its tidal marsh habitat in the San Francisco Estuary. We organized a collection of historical (1885-1940) and...
Authors
Angela Merritt, Michael Casazza, Cory Overton, John Takekawa, Thomas Hahn, Joshua Hull
Environmental extremes and biotic interactions facilitate depredation of endangered California Ridgway’s rail in a San Francisco Bay tidal marsh Environmental extremes and biotic interactions facilitate depredation of endangered California Ridgway’s rail in a San Francisco Bay tidal marsh
On 23 December 2015 while performing a high tide population survey for endangered Ridgway’s rails (Rallus obsoletus obsoletus; formerly known as the California clapper rail) and other rail species at Arrowhead Marsh, Martin Luther King Jr. Regional Shoreline, Oakland, California, the authors observed a series of species interactions resulting in the predation of a Ridgway’s rail by an...
Authors
Cory Overton, Steven Bobzien, Marcia Grefsrud
A century of landscape disturbance and urbanization of the San Francisco Bay region affects the present-day genetic diversity of the California Ridgway’s rail (Rallus obsoletus obsoletus) A century of landscape disturbance and urbanization of the San Francisco Bay region affects the present-day genetic diversity of the California Ridgway’s rail (Rallus obsoletus obsoletus)
Fragmentation and loss of natural habitat have important consequences for wild populations and can negatively affect long-term viability and resilience to environmental change. Salt marsh obligate species, such as those that occupy the San Francisco Bay Estuary in western North America, occupy already impaired habitats as result of human development and modifications and are highly...
Authors
Dustin Wood, Thuy-Vy Bui, Cory Overton, Amy Vandergast, Michael Casazza, Joshua Hull, John Takekawa
Depredation of the California Ridgway’s rail: Causes and distribution Depredation of the California Ridgway’s rail: Causes and distribution
We studied the causes of mortality for the California Ridgway’s rail at multiple tidal marshes in the San Francisco Bay Estuary, California. We radio-marked 196 individual rails and examined the evidence from 152 recovered California Ridgway’s rail mortalities from our radio-marked sample and determined plausible cause of death from a wide array of evidence. We also included 10...
Authors
Michael Casazza, Cory Overton, Thuy-Vy Bui, John Takekawa, Angela Merritt, J.M. Hull