Cory Overton
Cory Overton is a wildlife biologist at the Western Ecological Research Center.
Science and Products
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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 female duc
Authors
Rebecca Croston, Joshua T. Ackerman, Mark P. Herzog, Jeffrey D. Kohl, C. Alex Hartman, Sarah H. Peterson, Cory T. Overton, Cliff L. Feldheim, Michael L. Casazza
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 modern (20
Authors
Angela M. Merritt, Michael L. Casazza, Cory T. Overton, John Y. Takekawa, Thomas P. Hahn, Joshua M. Hull
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 adult female
Authors
Cory T. 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)
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 susceptible to
Authors
Dustin A. Wood, Thuy-Vy D. Bui, Cory T. Overton, Amy G. Vandergast, Michael L. Casazza, Joshua M. Hull, John Y. Takekawa
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 additional Californ
Authors
Michael L. Casazza, Cory T. Overton, Thuy-Vy D. Bui, John Y. Takekawa, Angela M. Merritt, J.M. Hull
Endangered species management and ecosystem restoration: Finding the common ground
Management actions to protect endangered species and conserve ecosystem function may not always be in precise alignment. Efforts to recover the California Ridgway’s Rail (Rallus obsoletus obsoletus; hereafter, California rail), a federally and state-listed species, and restoration of tidal marsh ecosystems in the San Francisco Bay estuary provide a prime example of habitat restoration that has con
Authors
Michael L. Casazza, Cory T. Overton, Thuy-Vy D. Bui, Joshua M. Hull, Joy D. Albertson, Valary K. Bloom, Steven Bobzien, Jennifer McBroom, Marilyn Latta, Peggy Olofson, Tobias M. Rohmer, Steven E. Schwarzbach, Donald R. Strong, Erik Grijalva, Julian K. Wood, Shannon Skalos, John Y. Takekawa
Science foundation Chapter 5 Appendix 5.1: Case study california ridgway's rail (Rallus obseoletus obsoletus)
The clapper rail (Rallus longirostris) recently was split into two sister groups (Chesser et al. 2014) on the basis of phylogenetic analyses (Maley and Brumfield 2013). The original grouping is now represented on the East Coast of North America by the Clapper rail (Rallus crepitans) and on the West Coast by the Ridgway’s rail (Rallus obsoletus). The California Ridgeway’s rail (Rallus obsoletus obs
Authors
Cory T. Overton, Julian Wood
Integrating spatially explicit indices of abundance and habitat quality: an applied example for greater sage-grouse management
Predictive species distributional models are a cornerstone of wildlife conservation planning. Constructing such models requires robust underpinning science that integrates formerly disparate data types to achieve effective species management.
Greater sage-grouse Centrocercus urophasianus, hereafter “sage-grouse” populations are declining throughout sagebrush-steppe ecosystems in North America,
Authors
Peter S. Coates, Michael L. Casazza, Mark A. Ricca, Brianne E. Brussee, Erik J. Blomberg, K. Benjamin Gustafson, Cory T. Overton, Dawn M. Davis, Lara E. Niell, Shawn P. Espinosa, Scott C. Gardner, David J. Delehanty
Intra-annual patterns in adult band-tailed pigeon survival estimates
Context: The band-tailed pigeon (Patagioenas fasciata) is a migratory species occurring in western North America with low recruitment potential and populations that have declined an average of 2.4% per year since the 1960s. Investigations into band-tailed pigeon demographic rates date back to the early 1900s, and existing annual survival rate estimates were derived in the 1970s using band return d
Authors
Michael L. Casazza, Peter S. Coates, Cory T. Overton, Kristy H. Howe
Movements of radio-marked California Ridgway's rails during monitoring surveys: Implications for population monitoring
The California Ridgway's rail Rallus obsoletus obsoletus (hereafter California rail) is a secretive marsh bird endemic to tidal marshes in the San Francisco Bay (hereafter bay) of California. The California rail has undergone significant range contraction and population declines due to a variety of factors, including predation and the degradation and loss of habitat. Call-count surveys, which incl
Authors
Thuy-Vy D. Bui, John Y. Takekawa, Cory T. Overton, Emily R. Schultz, Joshua M. Hull, Michael L. Casazza
Sea-level rise and refuge habitats for tidal marsh species: Can artificial islands save the California Ridgway's rail?
Terrestrial species living in intertidal habitats experience refuge limitation during periods of tidal inundation, which may be exacerbated by seasonal variation in vegetation structure, tidal cycles, and land-use change. Sea-level rise projections indicate the severity of refuge limitation may increase. Artificial habitats that provide escape cover during tidal inundation have been proposed as a
Authors
Cory T. Overton, John Y. Takekawa, Michael L. Casazza, Thuy-Vy D. Bui, Marcel Holyoak, Donald R. Strong
Dietary mercury exposure to endangered California Clapper Rails in San Francisco Bay
California Clapper Rails (Rallus longirostris obsoletus) are an endangered waterbird that forage in tidal-marsh habitats that pose risks from mercury exposure. We analyzed total mercury (Hg) in six macro-invertebrate and one fish species representing Clapper Rail diets from four tidal-marshes in San Francisco Bay, California. Mercury concentrations among individual taxa ranged from lowest at Colma
Authors
Michael L. Casazza, Mark A. Ricca, Cory T. Overton, John Y. Takekawa, Angela Merritt, Joshua T. Ackerman
Science and Products
Filter Total Items: 19
No Result Found
Filter Total Items: 50
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 female duc
Authors
Rebecca Croston, Joshua T. Ackerman, Mark P. Herzog, Jeffrey D. Kohl, C. Alex Hartman, Sarah H. Peterson, Cory T. Overton, Cliff L. Feldheim, Michael L. Casazza
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 modern (20
Authors
Angela M. Merritt, Michael L. Casazza, Cory T. Overton, John Y. Takekawa, Thomas P. Hahn, Joshua M. Hull
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 adult female
Authors
Cory T. 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)
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 susceptible to
Authors
Dustin A. Wood, Thuy-Vy D. Bui, Cory T. Overton, Amy G. Vandergast, Michael L. Casazza, Joshua M. Hull, John Y. Takekawa
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 additional Californ
Authors
Michael L. Casazza, Cory T. Overton, Thuy-Vy D. Bui, John Y. Takekawa, Angela M. Merritt, J.M. Hull
Endangered species management and ecosystem restoration: Finding the common ground
Management actions to protect endangered species and conserve ecosystem function may not always be in precise alignment. Efforts to recover the California Ridgway’s Rail (Rallus obsoletus obsoletus; hereafter, California rail), a federally and state-listed species, and restoration of tidal marsh ecosystems in the San Francisco Bay estuary provide a prime example of habitat restoration that has con
Authors
Michael L. Casazza, Cory T. Overton, Thuy-Vy D. Bui, Joshua M. Hull, Joy D. Albertson, Valary K. Bloom, Steven Bobzien, Jennifer McBroom, Marilyn Latta, Peggy Olofson, Tobias M. Rohmer, Steven E. Schwarzbach, Donald R. Strong, Erik Grijalva, Julian K. Wood, Shannon Skalos, John Y. Takekawa
Science foundation Chapter 5 Appendix 5.1: Case study california ridgway's rail (Rallus obseoletus obsoletus)
The clapper rail (Rallus longirostris) recently was split into two sister groups (Chesser et al. 2014) on the basis of phylogenetic analyses (Maley and Brumfield 2013). The original grouping is now represented on the East Coast of North America by the Clapper rail (Rallus crepitans) and on the West Coast by the Ridgway’s rail (Rallus obsoletus). The California Ridgeway’s rail (Rallus obsoletus obs
Authors
Cory T. Overton, Julian Wood
Integrating spatially explicit indices of abundance and habitat quality: an applied example for greater sage-grouse management
Predictive species distributional models are a cornerstone of wildlife conservation planning. Constructing such models requires robust underpinning science that integrates formerly disparate data types to achieve effective species management.
Greater sage-grouse Centrocercus urophasianus, hereafter “sage-grouse” populations are declining throughout sagebrush-steppe ecosystems in North America,
Authors
Peter S. Coates, Michael L. Casazza, Mark A. Ricca, Brianne E. Brussee, Erik J. Blomberg, K. Benjamin Gustafson, Cory T. Overton, Dawn M. Davis, Lara E. Niell, Shawn P. Espinosa, Scott C. Gardner, David J. Delehanty
Intra-annual patterns in adult band-tailed pigeon survival estimates
Context: The band-tailed pigeon (Patagioenas fasciata) is a migratory species occurring in western North America with low recruitment potential and populations that have declined an average of 2.4% per year since the 1960s. Investigations into band-tailed pigeon demographic rates date back to the early 1900s, and existing annual survival rate estimates were derived in the 1970s using band return d
Authors
Michael L. Casazza, Peter S. Coates, Cory T. Overton, Kristy H. Howe
Movements of radio-marked California Ridgway's rails during monitoring surveys: Implications for population monitoring
The California Ridgway's rail Rallus obsoletus obsoletus (hereafter California rail) is a secretive marsh bird endemic to tidal marshes in the San Francisco Bay (hereafter bay) of California. The California rail has undergone significant range contraction and population declines due to a variety of factors, including predation and the degradation and loss of habitat. Call-count surveys, which incl
Authors
Thuy-Vy D. Bui, John Y. Takekawa, Cory T. Overton, Emily R. Schultz, Joshua M. Hull, Michael L. Casazza
Sea-level rise and refuge habitats for tidal marsh species: Can artificial islands save the California Ridgway's rail?
Terrestrial species living in intertidal habitats experience refuge limitation during periods of tidal inundation, which may be exacerbated by seasonal variation in vegetation structure, tidal cycles, and land-use change. Sea-level rise projections indicate the severity of refuge limitation may increase. Artificial habitats that provide escape cover during tidal inundation have been proposed as a
Authors
Cory T. Overton, John Y. Takekawa, Michael L. Casazza, Thuy-Vy D. Bui, Marcel Holyoak, Donald R. Strong
Dietary mercury exposure to endangered California Clapper Rails in San Francisco Bay
California Clapper Rails (Rallus longirostris obsoletus) are an endangered waterbird that forage in tidal-marsh habitats that pose risks from mercury exposure. We analyzed total mercury (Hg) in six macro-invertebrate and one fish species representing Clapper Rail diets from four tidal-marshes in San Francisco Bay, California. Mercury concentrations among individual taxa ranged from lowest at Colma
Authors
Michael L. Casazza, Mark A. Ricca, Cory T. Overton, John Y. Takekawa, Angela Merritt, Joshua T. Ackerman