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Benjamin L Jensen (Former Employee)

Science and Products

Upper Skagit Reservoir Food Web Data, 2005-2021

This release includes data used to evaluate the structure and function of the Ross Lake and Diablo Lake food webs. This includes data on zooplankton density and production (zooplankton_density.csv and daphnia_region_production_biomass.csv), lake volume estimates used to expand zooplankton density and production data (lake_volume_estimates.csv), fish sampling (FishSampleEvents.csv), fish...
By
Western Fisheries Research Center

Bioenergetic Growth Performance of Rainbow Trout in Upper Skagit Reservoir Tributaries, 2018-2021

This dataset contains the information necessary for bioenergetics modeling of rainbow trout growth in select tributaries to the Upper Skagit River Hydroelectric reservoirs. The diet, invertebrate drift, and size-at-age data used to create modeling inputs is included in csv files. The input data generated for modeling can be found in the folder 'FB4 Upper Skagit Tributaries - Data Release...
By
Western Fisheries Research Center

Compilation of cost estimates for dam removal projects in the United States

This dataset provides cost estimates for 668 dam removal projects occurring in the United States. Cost estimates were obtained by searching the internet for sources of information that mention the cost of dam removal projects listed in the USGS Dam Removal Information Portal. When cost data were not available for a dam removal but contact information was, then personal communications...
By
Science Analytics and Synthesis (SAS) Program, Western Fisheries Research Center
Four nets submerged in a stream to capture drifting invertebrates
Four nets submerged in a stream to capture drifting invertebrates
Four nets submerged in a stream to capture drifting invertebrates
Four nets submerged in a stream to capture drifting invertebrates

Four nets submerged in a stream to capture drifting invertebrates

Four nets submerged in a stream to capture drifting invertebrates

Sampling drifting invertebrates from a stream in the North Cascades of Washington State. We perform drift sampling to determine the invertebrate prey quality and quantity available for drift feeding fish. Data gathered from this sampling are used in bioenergetics modeling, a method of estimating fish growth potential.

By
Western Fisheries Research Center
Four nets submerged in a stream to capture drifting invertebrates

Four nets submerged in a stream to capture drifting invertebrates

Four nets submerged in a stream to capture drifting invertebrates

Sampling drifting invertebrates from a stream in the North Cascades of Washington State. We perform drift sampling to determine the invertebrate prey quality and quantity available for drift feeding fish. Data gathered from this sampling are used in bioenergetics modeling, a method of estimating fish growth potential.

By
Western Fisheries Research Center
Two USGS researchers wait with their sampling equipment on a boat ramp at Ross Lake.
Scientists staging equipment on dock at Ross Lake, Washington preparing for field work
Scientists staging equipment on dock at Ross Lake, Washington preparing for field work
Two USGS researchers wait with their sampling equipment on a boat ramp at Ross Lake.

Scientists staging equipment on dock at Ross Lake, Washington preparing for field work

Scientists staging equipment on dock at Ross Lake, Washington preparing for field work

Researchers stage sampling equipment at the Ross Lake boat ramp and wait for boat to arrive to transport them to camping area. Food web sampling on large lakes requires a substantial amount of sampling gear. Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state.

By
Western Fisheries Research Center
Two USGS researchers wait with their sampling equipment on a boat ramp at Ross Lake.

Scientists staging equipment on dock at Ross Lake, Washington preparing for field work

Scientists staging equipment on dock at Ross Lake, Washington preparing for field work

Researchers stage sampling equipment at the Ross Lake boat ramp and wait for boat to arrive to transport them to camping area. Food web sampling on large lakes requires a substantial amount of sampling gear. Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state.

By
Western Fisheries Research Center
Scenic view of Ross Lake, Washington
Scenic view of Ross Lake, Washington
Scenic view of Ross Lake, Washington
Scenic view of Ross Lake, Washington

Scenic view of Ross Lake, Washington

Scenic view of Ross Lake, Washington

Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state.  This photo was taken while conducting food web research to support the Skagit River Hydroelectric Dam FERC relicensing process. To learn more about this project and other related research you can visit the WFRC Ecology Section website. 

By
Western Fisheries Research Center
Scenic view of Ross Lake, Washington

Scenic view of Ross Lake, Washington

Scenic view of Ross Lake, Washington

Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state.  This photo was taken while conducting food web research to support the Skagit River Hydroelectric Dam FERC relicensing process. To learn more about this project and other related research you can visit the WFRC Ecology Section website. 

By
Western Fisheries Research Center
Scenic view of Ross Lake, Washington with boat wake
Scenic view of Ross Lake, Washington with boat wake
Scenic view of Ross Lake, Washington with boat wake
Scenic view of Ross Lake, Washington with boat wake

Scenic view of Ross Lake, Washington with boat wake

Scenic view of Ross Lake, Washington with boat wake

Evening shot of Ross Lake with boat wake.  Heading back to camp after a day of research. Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state. This photo was taken while conducting food web research to support the Skagit River Hydroelectric Dam FERC relicensing process.

By
Western Fisheries Research Center
Scenic view of Ross Lake, Washington with boat wake

Scenic view of Ross Lake, Washington with boat wake

Scenic view of Ross Lake, Washington with boat wake

Evening shot of Ross Lake with boat wake.  Heading back to camp after a day of research. Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state. This photo was taken while conducting food web research to support the Skagit River Hydroelectric Dam FERC relicensing process.

By
Western Fisheries Research Center

Change in growth and prey utilization for a native salmonid following invasion by an omnivorous minnow in an oligotrophic reservoir

Aquatic invasive species can affect food web structure, native fish growth, and production, depending on the traits of the invasive species and the pre-invasion conditions of the ecosystem. Thermal tolerances and behavioral traits can further influence differential exploitation of resources shared between native and invasive species. An unauthorized introduction of redside shiner...
Authors
Rachelle Carina Johnson, Tessa Julianne Code, Karl D. Stenberg, Jonathan H Mclean, Benjamin Lorenz Jensen, Marshal Hoy, David Beauchamp
By
Ecosystems Mission Area, Western Fisheries Research Center

Prey supply and predation as potential limitations to feasibility of anadromous salmonid introductions in a reservoir

Introducing anadromous fish upstream of migration barriers has frequently been proposed as a conservation strategy, but existing conditions and future changes to the ecosystems above barriers such as invasive species, climate change, and varying water operations influence the capacity to support such introductions. In the Upper Skagit River, Washington, USA, introduction of anadromous...
Authors
Rachelle Carina Johnson, Benjamin Lorenz Jensen, Tessa Julianne Code, Jeffrey J. Duda, David Beauchamp
By
Ecosystems Mission Area, Western Fisheries Research Center

Shift in piscivory by salmonids following invasion of a minnow in an oligotrophic reservoir

Predation can play an important role in structuring ecological communities, and predator–prey dynamics can be altered following the introduction of new species. An unauthorized introduction of redside shiner (Richardsonius balteatus) into reservoirs in the Upper Skagit River, Washington, USA created concern that a consequent shift in predator–prey dynamics in the reservoirs could reduce...
Authors
Rachelle Carina Johnson, Marshal Hoy, Karl D. Stenberg, Jonathan H Mclean, Benjamin Lorenz Jensen, Tessa Julianne Code, Carl Ostberg, David Beauchamp
By
Ecosystems Mission Area, Western Fisheries Research Center

Growth performance of Rainbow Trout in reservoir tributaries and implications for steelhead growth potential above Skagit River dams

ObjectiveIn the Pacific Northwest (USA), Pacific salmon Oncorhynchus spp. populations have been declining significantly for decades, prompting stakeholders to respond with a variety of conservation and restoration measures. One such measure being considered in the Skagit River basin (Washington, USA) is the introduction of steelhead Oncorhynchus mykiss (anadromous Rainbow Trout) above...
Authors
Benjamin Lorenz Jensen, Rachelle Carina Johnson, Jeffrey J. Duda, Carl Ostberg, Tessa Julianne Code, Jonathan H Mclean, Karl D. Stenberg, Kimberly Larsen, Marshal Hoy, David Beauchamp
By
Ecosystems Mission Area, Western Fisheries Research Center

Patterns, drivers, and a predictive model of dam removal cost in the United States

Given the burgeoning dam removal movement and the large number of dams approaching obsolescence in the United States, cost estimating data and tools are needed for dam removal prioritization, planning, and execution. We used the list of removed dams compiled by American Rivers to search for publicly available reported costs for dam removal projects. Total cost information could include...
Authors
Jeffrey J. Duda, Suman Jumani, Daniel J. Wieferich, Desiree D. Tullos, S. Kyle McKay, Timothy J. Randle, Alvin Jansen, Susan Bailey, Benjamin Lorenz Jensen, Rachelle Carina Johnson, Ella J. Wagner, Kyla Breanne Richards, Seth J. Wenger, Eric J. Walther, Jennifer A. Bountry
By
Ecosystems Mission Area, Western Fisheries Research Center

Science and Products

Upper Skagit Reservoir Food Web Data, 2005-2021

This release includes data used to evaluate the structure and function of the Ross Lake and Diablo Lake food webs. This includes data on zooplankton density and production (zooplankton_density.csv and daphnia_region_production_biomass.csv), lake volume estimates used to expand zooplankton density and production data (lake_volume_estimates.csv), fish sampling (FishSampleEvents.csv), fish...
By
Western Fisheries Research Center

Bioenergetic Growth Performance of Rainbow Trout in Upper Skagit Reservoir Tributaries, 2018-2021

This dataset contains the information necessary for bioenergetics modeling of rainbow trout growth in select tributaries to the Upper Skagit River Hydroelectric reservoirs. The diet, invertebrate drift, and size-at-age data used to create modeling inputs is included in csv files. The input data generated for modeling can be found in the folder 'FB4 Upper Skagit Tributaries - Data Release...
By
Western Fisheries Research Center

Compilation of cost estimates for dam removal projects in the United States

This dataset provides cost estimates for 668 dam removal projects occurring in the United States. Cost estimates were obtained by searching the internet for sources of information that mention the cost of dam removal projects listed in the USGS Dam Removal Information Portal. When cost data were not available for a dam removal but contact information was, then personal communications...
By
Science Analytics and Synthesis (SAS) Program, Western Fisheries Research Center
Four nets submerged in a stream to capture drifting invertebrates
Four nets submerged in a stream to capture drifting invertebrates
Four nets submerged in a stream to capture drifting invertebrates
Four nets submerged in a stream to capture drifting invertebrates

Four nets submerged in a stream to capture drifting invertebrates

Four nets submerged in a stream to capture drifting invertebrates

Sampling drifting invertebrates from a stream in the North Cascades of Washington State. We perform drift sampling to determine the invertebrate prey quality and quantity available for drift feeding fish. Data gathered from this sampling are used in bioenergetics modeling, a method of estimating fish growth potential.

By
Western Fisheries Research Center
Four nets submerged in a stream to capture drifting invertebrates

Four nets submerged in a stream to capture drifting invertebrates

Four nets submerged in a stream to capture drifting invertebrates

Sampling drifting invertebrates from a stream in the North Cascades of Washington State. We perform drift sampling to determine the invertebrate prey quality and quantity available for drift feeding fish. Data gathered from this sampling are used in bioenergetics modeling, a method of estimating fish growth potential.

By
Western Fisheries Research Center
Two USGS researchers wait with their sampling equipment on a boat ramp at Ross Lake.
Scientists staging equipment on dock at Ross Lake, Washington preparing for field work
Scientists staging equipment on dock at Ross Lake, Washington preparing for field work
Two USGS researchers wait with their sampling equipment on a boat ramp at Ross Lake.

Scientists staging equipment on dock at Ross Lake, Washington preparing for field work

Scientists staging equipment on dock at Ross Lake, Washington preparing for field work

Researchers stage sampling equipment at the Ross Lake boat ramp and wait for boat to arrive to transport them to camping area. Food web sampling on large lakes requires a substantial amount of sampling gear. Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state.

By
Western Fisheries Research Center
Two USGS researchers wait with their sampling equipment on a boat ramp at Ross Lake.

Scientists staging equipment on dock at Ross Lake, Washington preparing for field work

Scientists staging equipment on dock at Ross Lake, Washington preparing for field work

Researchers stage sampling equipment at the Ross Lake boat ramp and wait for boat to arrive to transport them to camping area. Food web sampling on large lakes requires a substantial amount of sampling gear. Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state.

By
Western Fisheries Research Center
Scenic view of Ross Lake, Washington
Scenic view of Ross Lake, Washington
Scenic view of Ross Lake, Washington
Scenic view of Ross Lake, Washington

Scenic view of Ross Lake, Washington

Scenic view of Ross Lake, Washington

Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state.  This photo was taken while conducting food web research to support the Skagit River Hydroelectric Dam FERC relicensing process. To learn more about this project and other related research you can visit the WFRC Ecology Section website. 

By
Western Fisheries Research Center
Scenic view of Ross Lake, Washington

Scenic view of Ross Lake, Washington

Scenic view of Ross Lake, Washington

Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state.  This photo was taken while conducting food web research to support the Skagit River Hydroelectric Dam FERC relicensing process. To learn more about this project and other related research you can visit the WFRC Ecology Section website. 

By
Western Fisheries Research Center
Scenic view of Ross Lake, Washington with boat wake
Scenic view of Ross Lake, Washington with boat wake
Scenic view of Ross Lake, Washington with boat wake
Scenic view of Ross Lake, Washington with boat wake

Scenic view of Ross Lake, Washington with boat wake

Scenic view of Ross Lake, Washington with boat wake

Evening shot of Ross Lake with boat wake.  Heading back to camp after a day of research. Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state. This photo was taken while conducting food web research to support the Skagit River Hydroelectric Dam FERC relicensing process.

By
Western Fisheries Research Center
Scenic view of Ross Lake, Washington with boat wake

Scenic view of Ross Lake, Washington with boat wake

Scenic view of Ross Lake, Washington with boat wake

Evening shot of Ross Lake with boat wake.  Heading back to camp after a day of research. Ross Lake is a large reservoir in the North Cascade mountains of northern Washington state. This photo was taken while conducting food web research to support the Skagit River Hydroelectric Dam FERC relicensing process.

By
Western Fisheries Research Center

Change in growth and prey utilization for a native salmonid following invasion by an omnivorous minnow in an oligotrophic reservoir

Aquatic invasive species can affect food web structure, native fish growth, and production, depending on the traits of the invasive species and the pre-invasion conditions of the ecosystem. Thermal tolerances and behavioral traits can further influence differential exploitation of resources shared between native and invasive species. An unauthorized introduction of redside shiner...
Authors
Rachelle Carina Johnson, Tessa Julianne Code, Karl D. Stenberg, Jonathan H Mclean, Benjamin Lorenz Jensen, Marshal Hoy, David Beauchamp
By
Ecosystems Mission Area, Western Fisheries Research Center

Prey supply and predation as potential limitations to feasibility of anadromous salmonid introductions in a reservoir

Introducing anadromous fish upstream of migration barriers has frequently been proposed as a conservation strategy, but existing conditions and future changes to the ecosystems above barriers such as invasive species, climate change, and varying water operations influence the capacity to support such introductions. In the Upper Skagit River, Washington, USA, introduction of anadromous...
Authors
Rachelle Carina Johnson, Benjamin Lorenz Jensen, Tessa Julianne Code, Jeffrey J. Duda, David Beauchamp
By
Ecosystems Mission Area, Western Fisheries Research Center

Shift in piscivory by salmonids following invasion of a minnow in an oligotrophic reservoir

Predation can play an important role in structuring ecological communities, and predator–prey dynamics can be altered following the introduction of new species. An unauthorized introduction of redside shiner (Richardsonius balteatus) into reservoirs in the Upper Skagit River, Washington, USA created concern that a consequent shift in predator–prey dynamics in the reservoirs could reduce...
Authors
Rachelle Carina Johnson, Marshal Hoy, Karl D. Stenberg, Jonathan H Mclean, Benjamin Lorenz Jensen, Tessa Julianne Code, Carl Ostberg, David Beauchamp
By
Ecosystems Mission Area, Western Fisheries Research Center

Growth performance of Rainbow Trout in reservoir tributaries and implications for steelhead growth potential above Skagit River dams

ObjectiveIn the Pacific Northwest (USA), Pacific salmon Oncorhynchus spp. populations have been declining significantly for decades, prompting stakeholders to respond with a variety of conservation and restoration measures. One such measure being considered in the Skagit River basin (Washington, USA) is the introduction of steelhead Oncorhynchus mykiss (anadromous Rainbow Trout) above...
Authors
Benjamin Lorenz Jensen, Rachelle Carina Johnson, Jeffrey J. Duda, Carl Ostberg, Tessa Julianne Code, Jonathan H Mclean, Karl D. Stenberg, Kimberly Larsen, Marshal Hoy, David Beauchamp
By
Ecosystems Mission Area, Western Fisheries Research Center

Patterns, drivers, and a predictive model of dam removal cost in the United States

Given the burgeoning dam removal movement and the large number of dams approaching obsolescence in the United States, cost estimating data and tools are needed for dam removal prioritization, planning, and execution. We used the list of removed dams compiled by American Rivers to search for publicly available reported costs for dam removal projects. Total cost information could include...
Authors
Jeffrey J. Duda, Suman Jumani, Daniel J. Wieferich, Desiree D. Tullos, S. Kyle McKay, Timothy J. Randle, Alvin Jansen, Susan Bailey, Benjamin Lorenz Jensen, Rachelle Carina Johnson, Ella J. Wagner, Kyla Breanne Richards, Seth J. Wenger, Eric J. Walther, Jennifer A. Bountry
By
Ecosystems Mission Area, Western Fisheries Research Center
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