Patrick M Kocovsky
I am the Aquatic Invasive Species Program Manager within the Biological Threats and Invasive Species Research Program in the Ecosystems Mission Area.
I administer the USGS’ national research program on Aquatic Invasive Species. Our research foci include risk assessment, early detection and rapid response, and developing and evaluating deterrents and control methods for aquatic invasive species.
Education and Certifications
BS in Fishery Biology, magna cum laude, Colorado State, 1993
MS in Wildlife and Fisheries Science, Penn State, 1999
PhD in Wildlife and Fisheries Science, Penn State, 2004
Post-doc with USGS Northern Appalachian Research Lab on suitability of Susquehanna River tributaries for restoration of anadromous alosines and catadromous American Eel.
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 52
First direct confirmation of grass carp spawning in a Great Lakes tributary
Grass carp (Ctenopharyngodon idella), an invasive species of Asian carp, has been stocked for many decades in the United States for vegetation control. Adult individuals have been found in all of the Great Lakes except Lake Superior, but no self-sustaining populations have yet been identified in Great Lakes tributaries. In 2012, a commercial fisherman caught four juvenile diploid grass carp in the
Authors
Holly S. Embke, Patrick M. Kočovský, Cathy A. Richter, Jeremy J. Pritt, Christine M. Mayer, Song Qian
Developing fish trophic interaction indicators of climate change for the Great Lakes
This project addressed regional climate change effects on aquatic food webs in the Great Lakes. We sought insights by examining Lake Erie as a representative system with a high level of anthropogenic impacts, strong nutrient gradients, seasonal hypoxia, and spatial overlap of cold- and cool-water fish guilds. In Lake Erie and in large embayments throughout the Great Lakes basin, this situation is
Authors
Richard T. Kraus, Carey T. Knight, Ann Marie Gorman, Patrick M. Kočovský, Brian C. Weidel, Mark W. Rogers
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2015
In 2015, the U.S. Geological Survey’s (USGS) Lake Erie Biological Station (LEBS) successfully completed large vessel surveys in all three of Lake Erie’s basins. Lake Erie Biological Station’s primary vessel surveys included the Western Basin Forage Fish Assessment and East Harbor Fish Community Assessment as well as contributing to the cooperative multi-agency Central Basin Hydroacoustics Assessme
Authors
Betsy L. Bodamer Scarbro, W.H. Edwards, Patrick M. Kočovský, Richard T. Kraus, M. R. Rogers, A. L. Schoonyan, T. R. Stewart
Effects of freezing on white perch Morone americana (Gmelin, 1789): Implications for multivariate morphometrics
This study tested the hypothesis that duration of freezing differentially affects whole-body morphometrics of a derived teleost. Whole-body morphometrics are frequently analyzed to test hypotheses of different species, or stocks within a species, of fishes. Specimens used for morphometric analyses are typically fixed or preserved prior to analysis, yet little research has been done on how fixation
Authors
Patrick Kočovský
An examination of gender differences in the American Fisheries Society peer-review process
This study investigated the possibility of gender differences in outcomes throughout the peer review process of American Fisheries Society (AFS) journals. For each manuscript submitted to four AFS journals between January 2003 and December 2010, we collated information regarding the gender and nationality of authors, gender of associate editor, gender of reviewers, reviewer recommendations, associ
Authors
Grace Handley, Cynthia M Frantz, Patrick Kočovský, Dennis R. DeVries, Steven J. Cooke, Julie Claussen
Dynamic hypoxic zones in Lake Erie compress fish habitat, altering vulnerability to fishing gears
Seasonal degradation of aquatic habitats from hypoxia occurs in numerous freshwater and coastal marine systems and can result in direct mortality or displacement of fish. Yet, fishery landings from these systems are frequently unresponsive to changes in the severity and extent of hypoxia, and population-scale effects have been difficult to measure except in extreme hypoxic conditions with hypoxia-
Authors
Richard T. Kraus, Carey T. Knight, Troy M. Farmer, Ann Marie Gorman, Paris D. Collingsworth, Glenn J. Warren, Patrick M. Kočovský, Joseph D. Conroy
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2014
In 2014, the USGS LEBS successfully completed large vessel surveys in all three of Lake Erie’s basins. Lake Erie Biological Station’s primary vessel surveys included the Western Basin Forage Fish Assessment and East Harbor Forage Fish Assessment as well as contributing to the cooperative multi-agency Central Basin Hydroacoustics Assessment, the Eastern Basin Coldwater Community Assessment, and LTL
Authors
Betsy L. Bodamer Scarbro, William Edwards, Carrie Gawne, Patrick M. Kočovský, Richard T. Kraus, Mark W. Rogers, Taylor Stewart
Ecology and population status of trout-perch (Percopsis omiscomaycus) in western Lake Erie
Trout-perch Percopsis omiscomaycus is among the most abundant benthic species in Lake Erie, but comparatively little is known about its ecology. Although others have conducted extensive studies on trout-perch ecology, those efforts predated invasions of white perch Morone americana, Dreissena spp., Bythotrephes longimanus and round goby Neogobius melanostomus, suggesting the need to revisit past w
Authors
Patrick Kočovský, Andrea T. Stoneman, Richard T. Kraus
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2013
In 2013, the U.S. Geological Survey’s Lake Erie Biological Station successfully completed large vessel surveys in all three of Lake Erie’s basins. Lake Erie Biological Station’s primary vessel surveys included the Western Basin Forage Fish Assessment and East Harbor Forage Fish Assessment as well as contributing to the cooperative multi-agency Central Basin Hydroacoustics Assessment and the Easter
Authors
Richard T. Kraus, Mark W. Rogers, Patrick Kočovský, William Edwards, Betsy L. Bodamer Scarbro, Kevin R. Keretz, Stephanie A. Berkman
Development of a stock-recruitment model and assessment of biological reference points for the Lake Erie walleye fishery
We developed an updated stock–recruitment relationship for Lake Erie Walleye Sander vitreus using the Akaike information criterion model selection approach. Our best stock–recruitment relationship was a Ricker spawner–recruit function to which spring warming rate was added as an environmental variable, and this regression model explained 39% of the variability in Walleye recruitment over the 1978
Authors
Yingming Zhao, Patrick M. Kočovský, Charles P. Madenjian
Genetic and morphometric differences demonstrate fine-scale population substructure of the yellow perch Perca flavescens: need for redefined management units
Whole-body morphometrics and 15 nuclear DNA microsatellite loci were analysed for 158 Perca flavescens collected during the spawning season from four spawning locations in central Lake Erie, two along the northern shore and two along the southern shore, to evaluate fine-scale variation (spanning 17-94 km). Results showed significant morphological and genetic differences among P. flavescens from th
Authors
Patrick M. Kočovský, Timothy J. Sullivan, Carey T. Knight, Carol A. Stepien
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2012
No abstract available.
Authors
Richard T. Kraus, Mark Rogers, Patrick M. Kočovský, William Edwards, Betsy L. Bodamer Scarbro, Kevin R. Keretz, R. Wirick
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 52
First direct confirmation of grass carp spawning in a Great Lakes tributary
Grass carp (Ctenopharyngodon idella), an invasive species of Asian carp, has been stocked for many decades in the United States for vegetation control. Adult individuals have been found in all of the Great Lakes except Lake Superior, but no self-sustaining populations have yet been identified in Great Lakes tributaries. In 2012, a commercial fisherman caught four juvenile diploid grass carp in the
Authors
Holly S. Embke, Patrick M. Kočovský, Cathy A. Richter, Jeremy J. Pritt, Christine M. Mayer, Song Qian
Developing fish trophic interaction indicators of climate change for the Great Lakes
This project addressed regional climate change effects on aquatic food webs in the Great Lakes. We sought insights by examining Lake Erie as a representative system with a high level of anthropogenic impacts, strong nutrient gradients, seasonal hypoxia, and spatial overlap of cold- and cool-water fish guilds. In Lake Erie and in large embayments throughout the Great Lakes basin, this situation is
Authors
Richard T. Kraus, Carey T. Knight, Ann Marie Gorman, Patrick M. Kočovský, Brian C. Weidel, Mark W. Rogers
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2015
In 2015, the U.S. Geological Survey’s (USGS) Lake Erie Biological Station (LEBS) successfully completed large vessel surveys in all three of Lake Erie’s basins. Lake Erie Biological Station’s primary vessel surveys included the Western Basin Forage Fish Assessment and East Harbor Fish Community Assessment as well as contributing to the cooperative multi-agency Central Basin Hydroacoustics Assessme
Authors
Betsy L. Bodamer Scarbro, W.H. Edwards, Patrick M. Kočovský, Richard T. Kraus, M. R. Rogers, A. L. Schoonyan, T. R. Stewart
Effects of freezing on white perch Morone americana (Gmelin, 1789): Implications for multivariate morphometrics
This study tested the hypothesis that duration of freezing differentially affects whole-body morphometrics of a derived teleost. Whole-body morphometrics are frequently analyzed to test hypotheses of different species, or stocks within a species, of fishes. Specimens used for morphometric analyses are typically fixed or preserved prior to analysis, yet little research has been done on how fixation
Authors
Patrick Kočovský
An examination of gender differences in the American Fisheries Society peer-review process
This study investigated the possibility of gender differences in outcomes throughout the peer review process of American Fisheries Society (AFS) journals. For each manuscript submitted to four AFS journals between January 2003 and December 2010, we collated information regarding the gender and nationality of authors, gender of associate editor, gender of reviewers, reviewer recommendations, associ
Authors
Grace Handley, Cynthia M Frantz, Patrick Kočovský, Dennis R. DeVries, Steven J. Cooke, Julie Claussen
Dynamic hypoxic zones in Lake Erie compress fish habitat, altering vulnerability to fishing gears
Seasonal degradation of aquatic habitats from hypoxia occurs in numerous freshwater and coastal marine systems and can result in direct mortality or displacement of fish. Yet, fishery landings from these systems are frequently unresponsive to changes in the severity and extent of hypoxia, and population-scale effects have been difficult to measure except in extreme hypoxic conditions with hypoxia-
Authors
Richard T. Kraus, Carey T. Knight, Troy M. Farmer, Ann Marie Gorman, Paris D. Collingsworth, Glenn J. Warren, Patrick M. Kočovský, Joseph D. Conroy
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2014
In 2014, the USGS LEBS successfully completed large vessel surveys in all three of Lake Erie’s basins. Lake Erie Biological Station’s primary vessel surveys included the Western Basin Forage Fish Assessment and East Harbor Forage Fish Assessment as well as contributing to the cooperative multi-agency Central Basin Hydroacoustics Assessment, the Eastern Basin Coldwater Community Assessment, and LTL
Authors
Betsy L. Bodamer Scarbro, William Edwards, Carrie Gawne, Patrick M. Kočovský, Richard T. Kraus, Mark W. Rogers, Taylor Stewart
Ecology and population status of trout-perch (Percopsis omiscomaycus) in western Lake Erie
Trout-perch Percopsis omiscomaycus is among the most abundant benthic species in Lake Erie, but comparatively little is known about its ecology. Although others have conducted extensive studies on trout-perch ecology, those efforts predated invasions of white perch Morone americana, Dreissena spp., Bythotrephes longimanus and round goby Neogobius melanostomus, suggesting the need to revisit past w
Authors
Patrick Kočovský, Andrea T. Stoneman, Richard T. Kraus
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2013
In 2013, the U.S. Geological Survey’s Lake Erie Biological Station successfully completed large vessel surveys in all three of Lake Erie’s basins. Lake Erie Biological Station’s primary vessel surveys included the Western Basin Forage Fish Assessment and East Harbor Forage Fish Assessment as well as contributing to the cooperative multi-agency Central Basin Hydroacoustics Assessment and the Easter
Authors
Richard T. Kraus, Mark W. Rogers, Patrick Kočovský, William Edwards, Betsy L. Bodamer Scarbro, Kevin R. Keretz, Stephanie A. Berkman
Development of a stock-recruitment model and assessment of biological reference points for the Lake Erie walleye fishery
We developed an updated stock–recruitment relationship for Lake Erie Walleye Sander vitreus using the Akaike information criterion model selection approach. Our best stock–recruitment relationship was a Ricker spawner–recruit function to which spring warming rate was added as an environmental variable, and this regression model explained 39% of the variability in Walleye recruitment over the 1978
Authors
Yingming Zhao, Patrick M. Kočovský, Charles P. Madenjian
Genetic and morphometric differences demonstrate fine-scale population substructure of the yellow perch Perca flavescens: need for redefined management units
Whole-body morphometrics and 15 nuclear DNA microsatellite loci were analysed for 158 Perca flavescens collected during the spawning season from four spawning locations in central Lake Erie, two along the northern shore and two along the southern shore, to evaluate fine-scale variation (spanning 17-94 km). Results showed significant morphological and genetic differences among P. flavescens from th
Authors
Patrick M. Kočovský, Timothy J. Sullivan, Carey T. Knight, Carol A. Stepien
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2012
No abstract available.
Authors
Richard T. Kraus, Mark Rogers, Patrick M. Kočovský, William Edwards, Betsy L. Bodamer Scarbro, Kevin R. Keretz, R. Wirick