Bob Gresswell, Ph.D. (Former Employee)
Science and Products
FAQ on Invasive Lake Trout in Yellowstone Lake
These Frequently Asked Questions and responses were developed by USGS and their partners with the Lake Trout Suppression Scientific Review Panel *. The purpose of these FAQs is to provide answers to several of the more common questions concerning the lake trout suppression program in Yellowstone Lake, within Yellowstone National Park, and provide information about the current status of the program...
Predicting Effects of Climate Change on Native Fishes in Northern Great Plains Streams
The Northern Great Plains of North America are a region of profound global importance because organisms that live in these semi-arid prairie environments have developed a unique ability to live through conditions of extreme heat, cold, floods, and drought. Prairie streams are essential components of these ecosystems because they provide critical “green lines” of habitat for both aquatic and...
Estimating Future Streamflow in Eastern Montana Using the Precipitation-Runoff Modeling System and the RegCM3 Regional Climate Model
Streams in the Northern Great Plains provide critical “green lines” of habitat for aquatic and terrestrial wildlife. However, changes in water quantity associated with global climate change may transform some prairie streams from essential refuges to habitats no longer capable of supporting fishes. Although studies have examined climate change effects on larger river basins across the United...
Yellowstone Lake Acoustic Biotelemetry Project Home Page
Fishery biologists and managers are increasingly consumed with the recovery and restoration of native trout and salmon throughout the western United States. These fish historically inhabited a variety of freshwater habitats, but have declined due to habitat degradation, fragmentation and introduction of nonnative species. Introduced fishes constitute a major threat to the persistence of native...
Bob Gresswell's Past Projects
Bob Gresswell's Past Projects
Understanding Extreme Climate Events in the North Central U.S.
The climate of the North Central U.S. is driven by a combination of factors, including atmospheric circulation patterns, the region’s complex topography which extends from the High Rockies to the Great Plains, and variations in hydrology. Together, these factors determine the sustainability of the region’s ecosystems and the services that they provide communities. In order to understand...
Filter Total Items: 78
Fish response to successive clearcuts in a second-growth forest from the central Coast range of Oregon Fish response to successive clearcuts in a second-growth forest from the central Coast range of Oregon
Research dating back to the 1950 s has documented negative effects from harvesting of primeval forests on stream ecosystems of the Pacific Northwest. By the early 1990 s, state and federal forest practice rules governing timber harvest were modified throughout North America to better protect aquatic habitats and biotic resources, principally salmonids. These rules inspired a generation...
Authors
D. S. Bateman, Nathan Chelgren, Robert E. Gresswell, Jason B. Dunham, David Hockman-Wert, D. W. Leer, K. D. Bladon
Invasive Lake Trout reproduction in Yellowstone Lake under an active suppression program Invasive Lake Trout reproduction in Yellowstone Lake under an active suppression program
In Yellowstone Lake, predation by invasive Lake Trout Salvelinus namaycush has caused significant abundance declines in native Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri. Lake Trout suppression has been ongoing since 1995; assessment and simulation modeling are used to measure suppression effectiveness and guide efforts. Lake Trout reproduction demographics are linked to...
Authors
Nicholas A. Heredia, Robert E. Gresswell, Molly A.H. Webb, Travis O. Brenden, Philip T. Sandstrom
Carbon dioxide-induced mortality of four species of North American fishes Carbon dioxide-induced mortality of four species of North American fishes
Fisheries managers have a growing interest in the use of carbon dioxide (CO2) as a tool for controlling invasive fishes. However, limited published data exist on susceptibility of many commonly encountered species to elevated CO2 concentrations. Our objective was to estimate the 24-h 50% lethal concentration (LC50) and 95% lethal concentration (LC95) of CO2 for four fishes (Rainbow Trout
Authors
Hilary B. Treanor, Andrew M. Ray, Jon Amberg, Mark P. Gaikowski, Jason E. Ilgen, Robert Gresswell, Leslie Gains-Germain, Molly A H Webb
Yellowstone Lake ecosystem restoration: A case study for invasive fish management Yellowstone Lake ecosystem restoration: A case study for invasive fish management
Invasive predatory lake trout Salvelinus namaycush were discovered in Yellowstone Lake in 1994 and caused a precipitous decrease in abundance of native Yellowstone cutthroat trout Oncorhynchus clarkii bouvieri. Suppression efforts (primarily gillnetting) initiated in 1995 did not curtail lake trout population growth or lakewide expansion. An adaptive management strategy was developed in...
Authors
Todd M. Koel, Jeffrey L. Arnold, Patricia E. Bigelow, Travis O. Brenden, Jeffery D. Davis, Colleen R. Detjens, Philip D. Doepke, Brian D. Ertel, Hayley C. Glassic, Robert E. Gresswell, Christopher S Guy, Drew J. MacDonald, Michael E. Ruhl, Todd J. Stuth, David P. Sweet, John M. Syslo, Nathan A. Thomas, Lusha M. Tronstad, Patrick J. White, Alexander V. Zale
A call for global action to conserve native trout in the 21st century and beyond A call for global action to conserve native trout in the 21st century and beyond
Trout and char (hereafter, trout ) represent some of the more culturally, economically and ecologically important taxa of freshwater fishes worldwide (Kershner, Williams, Gresswell, & Lobón‐Cerviá, 2019a). Native to all continents in the Northern Hemisphere (as well as western Mediterranean Africa), trout belong to seven genera (Oncorhynchus , Salvelinus, Salmo , Hucho, Parahucho...
Authors
Daniel C. Dauwalter, Antonino Duchi, John Epifanio, A.J. Gandolfi, Robert E. Gresswell, Francis Juanes, Jeffrey L. Kershner, Javier Lobon-Cervia, Philip McGinnity, Andreas Meraner, Pavel Mikheev, Kentaro Morita, Clint C. Muhlfeld, Kurt Pinter, John Post, Gunther Unfer, Leif Asbjørn Vøllestad, Jack E. Williams
Revealing migration and reproductive habitat of invasive fish under an active population suppression program Revealing migration and reproductive habitat of invasive fish under an active population suppression program
Endemic species face a variety of threats including predation from non‐native invaders. In some cases, however, invasive species can be managed by directly suppressing populations, and tracking technologies that allow researchers to identify movement patterns and aggregations representative of the population can facilitate suppression activities. In Yellowstone Lake (Yellowstone National...
Authors
Lee F. G. Gutowsky, Jason G. Romine, Nicholas A. Heredia, Patricia E. Bigelow, Michael J. Parsley, Philip T. Sandstrom, Cory D. Suski, Andy J. Danylchuk, Steven J. Cooke, Robert E. Gresswell
Science and Products
FAQ on Invasive Lake Trout in Yellowstone Lake
These Frequently Asked Questions and responses were developed by USGS and their partners with the Lake Trout Suppression Scientific Review Panel *. The purpose of these FAQs is to provide answers to several of the more common questions concerning the lake trout suppression program in Yellowstone Lake, within Yellowstone National Park, and provide information about the current status of the program...
Predicting Effects of Climate Change on Native Fishes in Northern Great Plains Streams
The Northern Great Plains of North America are a region of profound global importance because organisms that live in these semi-arid prairie environments have developed a unique ability to live through conditions of extreme heat, cold, floods, and drought. Prairie streams are essential components of these ecosystems because they provide critical “green lines” of habitat for both aquatic and...
Estimating Future Streamflow in Eastern Montana Using the Precipitation-Runoff Modeling System and the RegCM3 Regional Climate Model
Streams in the Northern Great Plains provide critical “green lines” of habitat for aquatic and terrestrial wildlife. However, changes in water quantity associated with global climate change may transform some prairie streams from essential refuges to habitats no longer capable of supporting fishes. Although studies have examined climate change effects on larger river basins across the United...
Yellowstone Lake Acoustic Biotelemetry Project Home Page
Fishery biologists and managers are increasingly consumed with the recovery and restoration of native trout and salmon throughout the western United States. These fish historically inhabited a variety of freshwater habitats, but have declined due to habitat degradation, fragmentation and introduction of nonnative species. Introduced fishes constitute a major threat to the persistence of native...
Bob Gresswell's Past Projects
Bob Gresswell's Past Projects
Understanding Extreme Climate Events in the North Central U.S.
The climate of the North Central U.S. is driven by a combination of factors, including atmospheric circulation patterns, the region’s complex topography which extends from the High Rockies to the Great Plains, and variations in hydrology. Together, these factors determine the sustainability of the region’s ecosystems and the services that they provide communities. In order to understand...
Filter Total Items: 78
Fish response to successive clearcuts in a second-growth forest from the central Coast range of Oregon Fish response to successive clearcuts in a second-growth forest from the central Coast range of Oregon
Research dating back to the 1950 s has documented negative effects from harvesting of primeval forests on stream ecosystems of the Pacific Northwest. By the early 1990 s, state and federal forest practice rules governing timber harvest were modified throughout North America to better protect aquatic habitats and biotic resources, principally salmonids. These rules inspired a generation...
Authors
D. S. Bateman, Nathan Chelgren, Robert E. Gresswell, Jason B. Dunham, David Hockman-Wert, D. W. Leer, K. D. Bladon
Invasive Lake Trout reproduction in Yellowstone Lake under an active suppression program Invasive Lake Trout reproduction in Yellowstone Lake under an active suppression program
In Yellowstone Lake, predation by invasive Lake Trout Salvelinus namaycush has caused significant abundance declines in native Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri. Lake Trout suppression has been ongoing since 1995; assessment and simulation modeling are used to measure suppression effectiveness and guide efforts. Lake Trout reproduction demographics are linked to...
Authors
Nicholas A. Heredia, Robert E. Gresswell, Molly A.H. Webb, Travis O. Brenden, Philip T. Sandstrom
Carbon dioxide-induced mortality of four species of North American fishes Carbon dioxide-induced mortality of four species of North American fishes
Fisheries managers have a growing interest in the use of carbon dioxide (CO2) as a tool for controlling invasive fishes. However, limited published data exist on susceptibility of many commonly encountered species to elevated CO2 concentrations. Our objective was to estimate the 24-h 50% lethal concentration (LC50) and 95% lethal concentration (LC95) of CO2 for four fishes (Rainbow Trout
Authors
Hilary B. Treanor, Andrew M. Ray, Jon Amberg, Mark P. Gaikowski, Jason E. Ilgen, Robert Gresswell, Leslie Gains-Germain, Molly A H Webb
Yellowstone Lake ecosystem restoration: A case study for invasive fish management Yellowstone Lake ecosystem restoration: A case study for invasive fish management
Invasive predatory lake trout Salvelinus namaycush were discovered in Yellowstone Lake in 1994 and caused a precipitous decrease in abundance of native Yellowstone cutthroat trout Oncorhynchus clarkii bouvieri. Suppression efforts (primarily gillnetting) initiated in 1995 did not curtail lake trout population growth or lakewide expansion. An adaptive management strategy was developed in...
Authors
Todd M. Koel, Jeffrey L. Arnold, Patricia E. Bigelow, Travis O. Brenden, Jeffery D. Davis, Colleen R. Detjens, Philip D. Doepke, Brian D. Ertel, Hayley C. Glassic, Robert E. Gresswell, Christopher S Guy, Drew J. MacDonald, Michael E. Ruhl, Todd J. Stuth, David P. Sweet, John M. Syslo, Nathan A. Thomas, Lusha M. Tronstad, Patrick J. White, Alexander V. Zale
A call for global action to conserve native trout in the 21st century and beyond A call for global action to conserve native trout in the 21st century and beyond
Trout and char (hereafter, trout ) represent some of the more culturally, economically and ecologically important taxa of freshwater fishes worldwide (Kershner, Williams, Gresswell, & Lobón‐Cerviá, 2019a). Native to all continents in the Northern Hemisphere (as well as western Mediterranean Africa), trout belong to seven genera (Oncorhynchus , Salvelinus, Salmo , Hucho, Parahucho...
Authors
Daniel C. Dauwalter, Antonino Duchi, John Epifanio, A.J. Gandolfi, Robert E. Gresswell, Francis Juanes, Jeffrey L. Kershner, Javier Lobon-Cervia, Philip McGinnity, Andreas Meraner, Pavel Mikheev, Kentaro Morita, Clint C. Muhlfeld, Kurt Pinter, John Post, Gunther Unfer, Leif Asbjørn Vøllestad, Jack E. Williams
Revealing migration and reproductive habitat of invasive fish under an active population suppression program Revealing migration and reproductive habitat of invasive fish under an active population suppression program
Endemic species face a variety of threats including predation from non‐native invaders. In some cases, however, invasive species can be managed by directly suppressing populations, and tracking technologies that allow researchers to identify movement patterns and aggregations representative of the population can facilitate suppression activities. In Yellowstone Lake (Yellowstone National...
Authors
Lee F. G. Gutowsky, Jason G. Romine, Nicholas A. Heredia, Patricia E. Bigelow, Michael J. Parsley, Philip T. Sandstrom, Cory D. Suski, Andy J. Danylchuk, Steven J. Cooke, Robert E. Gresswell