Michael Dodrill
Michael is a Fish Biologist working for the USGS, Columbia River Research Laboratory.
Science and Products
Breathing Fresh Utility into an R Package for Aquatic Photosynthesis and Respiration
Enhance a widely used, USGS-led R package for stream metabolism estimation by adding new methods for human-impacted streams.
Proximal and distal factors associated with the decline in secondary invertebrate prey production in the Colorado River, Glen Canyon, Arizona. Proximal and distal factors associated with the decline in secondary invertebrate prey production in the Colorado River, Glen Canyon, Arizona.
Using a bioenergetic model, demographic data for the Rainbow Trout (Oncorhynchus mykiss) population were compiled and used to estimate total prey consumption in the Colorado River, Glen Canyon , AZ. Additionally, other data including invertebrate diet, drift, and benthic measurements were used to make generalized estimates of daily production rates for the most common benthic...
Humpback chub (Gila cypha) and mean daily water temperature data, western Grand Canyon - 2000 to 2016 Humpback chub (Gila cypha) and mean daily water temperature data, western Grand Canyon - 2000 to 2016
These data were compiled to examine patterns of humpback chub (Gila cypha) in western Grand Canyon from just below Havasu Creek at river kilometer (rkm) 253 (Lees Ferry is rkm 0) downriver to Pearce Ferry at rkm 451. These data represent mean daily water temperatures in degrees Celsius from two USGS gaging locations (2005-2016), catches of individual humpback chub in hoop nets (2005-2016...
Gross primary production estimates and associated light, sediment, and water quality data from the Colorado River below Glen Canyon Dam Gross primary production estimates and associated light, sediment, and water quality data from the Colorado River below Glen Canyon Dam
These data were compiled to model the effects of flow regime and bed grain size distributions on rates of gross primary production (GPP) in the Colorado River below Glen Canyon Dam, AZ, USA. The objectives of our study were to quantify daily and weekly scale effects of an experimental flow regime on GPP in the Colorado River. The experimental flow was conducted at Glen Canyon Dam from...
Rainbow trout diet and invertebrate drift data from 2012-2015 for the Colorado River, Grand Canyon, Arizona Rainbow trout diet and invertebrate drift data from 2012-2015 for the Colorado River, Grand Canyon, Arizona
These data were compiled to explore the foraging ecology of Rainbow Trout (Oncorhynchus mykiss) in the Colorado River, Grand Canyon, Arizona. These data represent samples characterizing the availability of drifting invertebrate prey (hereafter, drift) and use of these invertebrate prey by rainbow trout determined by gut samples (hereafter, diets). Drift and diet sampling occurred in five...
Marginalizing Bayesian population models - data for examples in the Grand Canyon region, southeastern Arizona, western Oregon USA - 1990-2015 Marginalizing Bayesian population models - data for examples in the Grand Canyon region, southeastern Arizona, western Oregon USA - 1990-2015
These data were compiled here to fit various versions of Bayesian population models and compare their performance, primarily the time required to make inferences using different softwares and versions of code. The humpback chub data were collected by US Geological Survey and US Fish and Wildlife service in the Colorado and Little Colorado Rivers from April 2009 to October 2017. Adult...
Filter Total Items: 21
Restoration is a partial but not complete solution for long-term declines in oyster populations—A case history from the northeastern Gulf of America Restoration is a partial but not complete solution for long-term declines in oyster populations—A case history from the northeastern Gulf of America
Objective We sought to evaluate whether oyster reef restoration is associated with sustained increases in intertidal eastern oyster Crassostrea virginica density in Suwannee Sound, Florida, and to examine how commercial fishing activity and freshwater discharge may modify those patterns.Methods We monitored intertidal oyster reefs for 14 years, including 9 years prior to large-scale...
Authors
W. E. Pine, J. F. Moore, Michael J. Dodrill, J. Aufmuth, M. Moreno, T. S. Coleman, J. Casteel, S. Beck, B. Ennis, N. Rogers, P. C Frederick
Assessment of Chinook Salmon smolt survival at offsite release locations in the Sacramento River across wet and dry years Assessment of Chinook Salmon smolt survival at offsite release locations in the Sacramento River across wet and dry years
We used acoustic telemetry to estimate survival of tagged release groups, and quantify differences between alternative hatchery release strategies. To assess whether offsite release could increase survival of hatchery fish relative to those released at the hatchery, we compare survival during emigration of hatchery fall Chinook Salmon (FCS, Oncorhynchus tshawytscha) smolts released...
Authors
Michael J. Dodrill, Sarah Austing, Kevin Niemela, Russell W. Perry
Who needs closure? Estimating abundance with a Markovian availability model for geographically open removal sampling Who needs closure? Estimating abundance with a Markovian availability model for geographically open removal sampling
Removal sampling is an important method for estimating abundance, but nearly all removal models assume closure during sampling. Yet, closure may be difficult to assume, evaluate, or enforce in many settings. To address situations where populations are geographically open between each removal sample, we incorporated a Markovian availability process into an N-mixture model framework. This...
Authors
Russell W. Perry, Adam C. Pope, A. Noble Hendrix, Joseph E. Kirsch, Bryan G. Matthias, Michael J. Dodrill
U.S. Geological Survey Grand Canyon Monitoring and Research Center: Proceedings of the fiscal year 2023 annual reporting meeting to the Glen Canyon Dam Adaptive Management Program U.S. Geological Survey Grand Canyon Monitoring and Research Center: Proceedings of the fiscal year 2023 annual reporting meeting to the Glen Canyon Dam Adaptive Management Program
This proceedings is prepared for the USBR and Glen Canyon Dam Adaptive Management Program (GCDAMP) to account for work conducted and products delivered in FY 2023 by SBSC's Grand Canyon Monitoring and Research Center (GCMRC) and to inform the Technical Work Group of science conducted by GCMRC and its cooperators in support of the GCDAMP. It includes a summary of accomplishments...
Authors
Andrew Alan Schultz, Gregory Mark Anderson, David J. Topping, Ronald E. Griffiths, David J. Dean, Paul E. Grams, Keith A. Kohl, Gerard Lewis Salter, Matthew A. Kaplinski, Katherine Chapman, Erich R. Mueller, Emily C. Palmquist, Bradley J. Butterfield, Joel B. Sankey, Bridget R. Deemer, Charles B. Yackulic, Lindsay Erika Hansen, Drew Elliot Eppehimer, Theodore Kennedy, Anya Metcalfe, Jeffrey Muehlbauer, Morgan Ford, Michael J. Dodrill, Maria C. Dzul, Pilar Rinker, Michael J. Pillow, David Ward, Josh Korman, Molly A.H. Webb, James A. Crossman, Eric J Frye, David L. Rogowski, Kimberley Dibble, Lucas Bair, Joshua Abbott, Thomas M. Gushue, Erica Paige Byerley, Joseph E Thomas, Thomas A. Sabol, Bryce Anthony Mihalevich
Insectivorous bat foraging tracks the availability of aquatic flies (Diptera) Insectivorous bat foraging tracks the availability of aquatic flies (Diptera)
Rivers and their adjacent riparian zones are model ecosystems for observing cross-ecosystem energy transfers. Aquatic insects emerging from streams, for example, are resource subsidies that support riparian consumers such as birds, spiders, lizards, and bats. We collaborated with recreational river runners in Grand Canyon, Arizona, USA, to record acoustic bat activity and sample riparian...
Authors
Anya Metcalfe, Carol Fritzinger, Theodore J. Weller, Michael J. Dodrill, Jeffrey Muehlbauer, Charles B. Yackulic, Brandon P. Holton, Cheyenne Maxime Szydlo, Laura E. Durning, Joel B. Sankey, Theodore Kennedy
Declines in prey production during the collapse of a tailwater Rainbow Trout population are associated with changing reservoir conditions Declines in prey production during the collapse of a tailwater Rainbow Trout population are associated with changing reservoir conditions
Objective85% in the number of Rainbow TroutOncorhynchus mykiss found in the tailwater portion of the Colorado River below Glen Canyon Dam during 2012–2016.Methods
Authors
Michael D. Yard, Charles B. Yackulic, Josh Korman, Michael J. Dodrill, Bridget R. Deemer
Simulating post-dam removal effects of hatchery operations and disease on juvenile Chinook salmon (Oncorhynchus tshawytscha) production in the Lower Klamath River, California Simulating post-dam removal effects of hatchery operations and disease on juvenile Chinook salmon (Oncorhynchus tshawytscha) production in the Lower Klamath River, California
Authors
Russell W. Perry, John M. Plumb, Michael J. Dodrill, Nicholas A. Som, H. Eve Robinson, Nicholas J. Hetrick
Extending the Stream Salmonid Simulator to accommodate the life history of coho salmon (Oncorhynchus kisutch) in the Klamath River Basin, Northern California Extending the Stream Salmonid Simulator to accommodate the life history of coho salmon (Oncorhynchus kisutch) in the Klamath River Basin, Northern California
In this report, we apply the stream salmonid simulator (S3) to coho salmon (Oncorhynchus kisutch) in the Klamath River Basin by extending the original model to account for life history and disease dynamics specific to coho salmon. This version of S3 includes tracking of three separate life-history strategies representing the different time periods and ages at which fish leave natal...
Authors
Michael J. Dodrill, Russell W. Perry, Nicholas A. Som, Christopher V. Manhard, Julie D. Alexander
Experimental reductions in sub-daily flow fluctuations increased gross primary productivity for 425 river kilometers downstream Experimental reductions in sub-daily flow fluctuations increased gross primary productivity for 425 river kilometers downstream
Aquatic primary production is the foundation of many river food webs. Dams change the physical template of rivers, often driving food webs toward greater reliance on aquatic primary production. Nonetheless, the effects of regulated flow regimes on primary production are poorly understood. Load following is a common dam flow management strategy that involves sub-daily changes in water...
Authors
Bridget R. Deemer, Charles B. Yackulic, Robert O Hall Jr., Michael J. Dodrill, Theodore Kennedy, Jeffrey Muehlbauer, David J. Topping, Nicholas Voichick, Michael D. Yard
Quantifying the effects of tides, river flow, and barriers on movements of Chinook Salmon smolts at junctions in the Sacramento–San Joaquin River Delta using multistate models Quantifying the effects of tides, river flow, and barriers on movements of Chinook Salmon smolts at junctions in the Sacramento–San Joaquin River Delta using multistate models
Successful migration of Chinook Salmon (Oncorhynchus tshawytscha) smolts seaward in the Sacramento – San Joaquin River Delta (hereafter, Delta) requires navigating a network of numerous branching channels. Within the Delta, several key junctions route smolts either towards more direct paths to the ocean or towards the interior Delta, an area associated with decreased survival. Movements...
Authors
Michael J. Dodrill, Russell Perry, Adam C. Pope, Xiaochun Wang
As the prey thickens: Rainbow trout select prey based upon width not length As the prey thickens: Rainbow trout select prey based upon width not length
Drift-feeding fish are typically considered size-selective predators. Yet, few studies have explicitly tested which aspect of prey “size” best explains size selection by drift-foraging fish. Here, we develop a Bayesian discrete choice model to evaluate how attributes of both prey and predator simultaneously influence size-selective foraging. We apply the model to a large dataset of...
Authors
Michael J. Dodrill, Charles B. Yackulic, Theodore Kennedy, Michael D. Yard, Josh Korman
Changes in prey, turbidity, and competition reduce somatic growth and cause the collapse of a fish population Changes in prey, turbidity, and competition reduce somatic growth and cause the collapse of a fish population
Somatic growth exerts strong control on patterns in the abundance of animal populations via effects on maturation, fecundity, and survival rates of juveniles and adults. In this paper, we quantify abiotic and biotic drivers of rainbow trout growth in the Colorado River, AZ, and the resulting impact on spatial and temporal variation in abundance. Inferences are based on approximately 10...
Authors
Josh Korman, Michael D. Yard, Maria C. Dzul, Charles B. Yackulic, Michael J. Dodrill, Bridget R. Deemer, Theodore Kennedy
Science and Products
Breathing Fresh Utility into an R Package for Aquatic Photosynthesis and Respiration
Enhance a widely used, USGS-led R package for stream metabolism estimation by adding new methods for human-impacted streams.
Proximal and distal factors associated with the decline in secondary invertebrate prey production in the Colorado River, Glen Canyon, Arizona. Proximal and distal factors associated with the decline in secondary invertebrate prey production in the Colorado River, Glen Canyon, Arizona.
Using a bioenergetic model, demographic data for the Rainbow Trout (Oncorhynchus mykiss) population were compiled and used to estimate total prey consumption in the Colorado River, Glen Canyon , AZ. Additionally, other data including invertebrate diet, drift, and benthic measurements were used to make generalized estimates of daily production rates for the most common benthic...
Humpback chub (Gila cypha) and mean daily water temperature data, western Grand Canyon - 2000 to 2016 Humpback chub (Gila cypha) and mean daily water temperature data, western Grand Canyon - 2000 to 2016
These data were compiled to examine patterns of humpback chub (Gila cypha) in western Grand Canyon from just below Havasu Creek at river kilometer (rkm) 253 (Lees Ferry is rkm 0) downriver to Pearce Ferry at rkm 451. These data represent mean daily water temperatures in degrees Celsius from two USGS gaging locations (2005-2016), catches of individual humpback chub in hoop nets (2005-2016...
Gross primary production estimates and associated light, sediment, and water quality data from the Colorado River below Glen Canyon Dam Gross primary production estimates and associated light, sediment, and water quality data from the Colorado River below Glen Canyon Dam
These data were compiled to model the effects of flow regime and bed grain size distributions on rates of gross primary production (GPP) in the Colorado River below Glen Canyon Dam, AZ, USA. The objectives of our study were to quantify daily and weekly scale effects of an experimental flow regime on GPP in the Colorado River. The experimental flow was conducted at Glen Canyon Dam from...
Rainbow trout diet and invertebrate drift data from 2012-2015 for the Colorado River, Grand Canyon, Arizona Rainbow trout diet and invertebrate drift data from 2012-2015 for the Colorado River, Grand Canyon, Arizona
These data were compiled to explore the foraging ecology of Rainbow Trout (Oncorhynchus mykiss) in the Colorado River, Grand Canyon, Arizona. These data represent samples characterizing the availability of drifting invertebrate prey (hereafter, drift) and use of these invertebrate prey by rainbow trout determined by gut samples (hereafter, diets). Drift and diet sampling occurred in five...
Marginalizing Bayesian population models - data for examples in the Grand Canyon region, southeastern Arizona, western Oregon USA - 1990-2015 Marginalizing Bayesian population models - data for examples in the Grand Canyon region, southeastern Arizona, western Oregon USA - 1990-2015
These data were compiled here to fit various versions of Bayesian population models and compare their performance, primarily the time required to make inferences using different softwares and versions of code. The humpback chub data were collected by US Geological Survey and US Fish and Wildlife service in the Colorado and Little Colorado Rivers from April 2009 to October 2017. Adult...
Filter Total Items: 21
Restoration is a partial but not complete solution for long-term declines in oyster populations—A case history from the northeastern Gulf of America Restoration is a partial but not complete solution for long-term declines in oyster populations—A case history from the northeastern Gulf of America
Objective We sought to evaluate whether oyster reef restoration is associated with sustained increases in intertidal eastern oyster Crassostrea virginica density in Suwannee Sound, Florida, and to examine how commercial fishing activity and freshwater discharge may modify those patterns.Methods We monitored intertidal oyster reefs for 14 years, including 9 years prior to large-scale...
Authors
W. E. Pine, J. F. Moore, Michael J. Dodrill, J. Aufmuth, M. Moreno, T. S. Coleman, J. Casteel, S. Beck, B. Ennis, N. Rogers, P. C Frederick
Assessment of Chinook Salmon smolt survival at offsite release locations in the Sacramento River across wet and dry years Assessment of Chinook Salmon smolt survival at offsite release locations in the Sacramento River across wet and dry years
We used acoustic telemetry to estimate survival of tagged release groups, and quantify differences between alternative hatchery release strategies. To assess whether offsite release could increase survival of hatchery fish relative to those released at the hatchery, we compare survival during emigration of hatchery fall Chinook Salmon (FCS, Oncorhynchus tshawytscha) smolts released...
Authors
Michael J. Dodrill, Sarah Austing, Kevin Niemela, Russell W. Perry
Who needs closure? Estimating abundance with a Markovian availability model for geographically open removal sampling Who needs closure? Estimating abundance with a Markovian availability model for geographically open removal sampling
Removal sampling is an important method for estimating abundance, but nearly all removal models assume closure during sampling. Yet, closure may be difficult to assume, evaluate, or enforce in many settings. To address situations where populations are geographically open between each removal sample, we incorporated a Markovian availability process into an N-mixture model framework. This...
Authors
Russell W. Perry, Adam C. Pope, A. Noble Hendrix, Joseph E. Kirsch, Bryan G. Matthias, Michael J. Dodrill
U.S. Geological Survey Grand Canyon Monitoring and Research Center: Proceedings of the fiscal year 2023 annual reporting meeting to the Glen Canyon Dam Adaptive Management Program U.S. Geological Survey Grand Canyon Monitoring and Research Center: Proceedings of the fiscal year 2023 annual reporting meeting to the Glen Canyon Dam Adaptive Management Program
This proceedings is prepared for the USBR and Glen Canyon Dam Adaptive Management Program (GCDAMP) to account for work conducted and products delivered in FY 2023 by SBSC's Grand Canyon Monitoring and Research Center (GCMRC) and to inform the Technical Work Group of science conducted by GCMRC and its cooperators in support of the GCDAMP. It includes a summary of accomplishments...
Authors
Andrew Alan Schultz, Gregory Mark Anderson, David J. Topping, Ronald E. Griffiths, David J. Dean, Paul E. Grams, Keith A. Kohl, Gerard Lewis Salter, Matthew A. Kaplinski, Katherine Chapman, Erich R. Mueller, Emily C. Palmquist, Bradley J. Butterfield, Joel B. Sankey, Bridget R. Deemer, Charles B. Yackulic, Lindsay Erika Hansen, Drew Elliot Eppehimer, Theodore Kennedy, Anya Metcalfe, Jeffrey Muehlbauer, Morgan Ford, Michael J. Dodrill, Maria C. Dzul, Pilar Rinker, Michael J. Pillow, David Ward, Josh Korman, Molly A.H. Webb, James A. Crossman, Eric J Frye, David L. Rogowski, Kimberley Dibble, Lucas Bair, Joshua Abbott, Thomas M. Gushue, Erica Paige Byerley, Joseph E Thomas, Thomas A. Sabol, Bryce Anthony Mihalevich
Insectivorous bat foraging tracks the availability of aquatic flies (Diptera) Insectivorous bat foraging tracks the availability of aquatic flies (Diptera)
Rivers and their adjacent riparian zones are model ecosystems for observing cross-ecosystem energy transfers. Aquatic insects emerging from streams, for example, are resource subsidies that support riparian consumers such as birds, spiders, lizards, and bats. We collaborated with recreational river runners in Grand Canyon, Arizona, USA, to record acoustic bat activity and sample riparian...
Authors
Anya Metcalfe, Carol Fritzinger, Theodore J. Weller, Michael J. Dodrill, Jeffrey Muehlbauer, Charles B. Yackulic, Brandon P. Holton, Cheyenne Maxime Szydlo, Laura E. Durning, Joel B. Sankey, Theodore Kennedy
Declines in prey production during the collapse of a tailwater Rainbow Trout population are associated with changing reservoir conditions Declines in prey production during the collapse of a tailwater Rainbow Trout population are associated with changing reservoir conditions
Objective85% in the number of Rainbow TroutOncorhynchus mykiss found in the tailwater portion of the Colorado River below Glen Canyon Dam during 2012–2016.Methods
Authors
Michael D. Yard, Charles B. Yackulic, Josh Korman, Michael J. Dodrill, Bridget R. Deemer
Simulating post-dam removal effects of hatchery operations and disease on juvenile Chinook salmon (Oncorhynchus tshawytscha) production in the Lower Klamath River, California Simulating post-dam removal effects of hatchery operations and disease on juvenile Chinook salmon (Oncorhynchus tshawytscha) production in the Lower Klamath River, California
Authors
Russell W. Perry, John M. Plumb, Michael J. Dodrill, Nicholas A. Som, H. Eve Robinson, Nicholas J. Hetrick
Extending the Stream Salmonid Simulator to accommodate the life history of coho salmon (Oncorhynchus kisutch) in the Klamath River Basin, Northern California Extending the Stream Salmonid Simulator to accommodate the life history of coho salmon (Oncorhynchus kisutch) in the Klamath River Basin, Northern California
In this report, we apply the stream salmonid simulator (S3) to coho salmon (Oncorhynchus kisutch) in the Klamath River Basin by extending the original model to account for life history and disease dynamics specific to coho salmon. This version of S3 includes tracking of three separate life-history strategies representing the different time periods and ages at which fish leave natal...
Authors
Michael J. Dodrill, Russell W. Perry, Nicholas A. Som, Christopher V. Manhard, Julie D. Alexander
Experimental reductions in sub-daily flow fluctuations increased gross primary productivity for 425 river kilometers downstream Experimental reductions in sub-daily flow fluctuations increased gross primary productivity for 425 river kilometers downstream
Aquatic primary production is the foundation of many river food webs. Dams change the physical template of rivers, often driving food webs toward greater reliance on aquatic primary production. Nonetheless, the effects of regulated flow regimes on primary production are poorly understood. Load following is a common dam flow management strategy that involves sub-daily changes in water...
Authors
Bridget R. Deemer, Charles B. Yackulic, Robert O Hall Jr., Michael J. Dodrill, Theodore Kennedy, Jeffrey Muehlbauer, David J. Topping, Nicholas Voichick, Michael D. Yard
Quantifying the effects of tides, river flow, and barriers on movements of Chinook Salmon smolts at junctions in the Sacramento–San Joaquin River Delta using multistate models Quantifying the effects of tides, river flow, and barriers on movements of Chinook Salmon smolts at junctions in the Sacramento–San Joaquin River Delta using multistate models
Successful migration of Chinook Salmon (Oncorhynchus tshawytscha) smolts seaward in the Sacramento – San Joaquin River Delta (hereafter, Delta) requires navigating a network of numerous branching channels. Within the Delta, several key junctions route smolts either towards more direct paths to the ocean or towards the interior Delta, an area associated with decreased survival. Movements...
Authors
Michael J. Dodrill, Russell Perry, Adam C. Pope, Xiaochun Wang
As the prey thickens: Rainbow trout select prey based upon width not length As the prey thickens: Rainbow trout select prey based upon width not length
Drift-feeding fish are typically considered size-selective predators. Yet, few studies have explicitly tested which aspect of prey “size” best explains size selection by drift-foraging fish. Here, we develop a Bayesian discrete choice model to evaluate how attributes of both prey and predator simultaneously influence size-selective foraging. We apply the model to a large dataset of...
Authors
Michael J. Dodrill, Charles B. Yackulic, Theodore Kennedy, Michael D. Yard, Josh Korman
Changes in prey, turbidity, and competition reduce somatic growth and cause the collapse of a fish population Changes in prey, turbidity, and competition reduce somatic growth and cause the collapse of a fish population
Somatic growth exerts strong control on patterns in the abundance of animal populations via effects on maturation, fecundity, and survival rates of juveniles and adults. In this paper, we quantify abiotic and biotic drivers of rainbow trout growth in the Colorado River, AZ, and the resulting impact on spatial and temporal variation in abundance. Inferences are based on approximately 10...
Authors
Josh Korman, Michael D. Yard, Maria C. Dzul, Charles B. Yackulic, Michael J. Dodrill, Bridget R. Deemer, Theodore Kennedy