Adam Pope
Adam is a Research Statistician (Biology) at the Columbia River Research Laboratory.
Science and Products
Acoustic-tagged juvenile Chinook salmon (Oncorhynchus tshawytscha), steelhead (O. mykiss), and sockeye salmon (O. nerka) detections in the Yakima River, Washington, 2018-2024 (version 1.1, September 2025) Acoustic-tagged juvenile Chinook salmon (Oncorhynchus tshawytscha), steelhead (O. mykiss), and sockeye salmon (O. nerka) detections in the Yakima River, Washington, 2018-2024 (version 1.1, September 2025)
Juvenile Chinook salmon (age 0 and age 1), steelhead, and sockeye salmon were tagged with acoustic transmitters and released at sites along the Yakima River in and below Yakima, WA from 2018 to 2024. Detection sites varied across years but included arrays placed at diversion dams, canals, hydropower facilities, and other locations throughout the Yakima and Columbia rivers. Study design...
The North Delta Routing and Survival Management Tool The North Delta Routing and Survival Management Tool
Understanding how routing modifications influence survival of juvenile salmon is complex because reach-specific survival and routing at key river junctions in the North Delta each have a different relationship with river flow. Therefore, to facilitate understanding of how routing modifications at key river junctions influence through-Delta survival, we developed this spreadsheet model to...
Distribution and stomach contents of fishes in the northern Sacramento-San Joaquin Delta, 2020-2022 Distribution and stomach contents of fishes in the northern Sacramento-San Joaquin Delta, 2020-2022
This data set includes count, location, and ancillary habitat data for fishes sampled in adjacent reaches of Georgiana Slough, Sacramento River, and Steamboat Slough in the northern Sacramento-San Joaquin Delta. It also includes data on the stomach contents of selected individual black basses (Micropterus). Fishes were sampled by boat electrofishing from approximately January-May, 2020...
Filter Total Items: 24
Survival, travel time, and use of migration routes by juvenile steelhead in a modified river estuary Survival, travel time, and use of migration routes by juvenile steelhead in a modified river estuary
Greater understanding of the survival, travel time, and spatial distribution of juvenile salmonids among migration routes between their natal streams and the ocean is critical to the recovery of these threatened species. In the Sacramento–San Joaquin River Delta (Delta), a highly modified estuary in central California, USA, there is a critical need to evaluate how water management (e.g...
Authors
Adam Pope, Russell Perry, Dalton Hance, Rebecca A. Buchanan
Using parentage-based tagging to estimate survival of Chinook salmon fry in a large storage reservoir Using parentage-based tagging to estimate survival of Chinook salmon fry in a large storage reservoir
Research efforts focusing on salmonid populations have highlighted the need to better understand demographic parameters for the fry and parr life stages. Monitoring these small fish presents a challenge because negative effects from handling and tagging can bias subsequent parameter estimates. Removal models and associated sampling designs represent one class of mark-recapture models...
Authors
Adam Pope, Tobias J. Kock, Russell Perry, Karen M. Cogliati, Kathleen G. O'Malley, Christina Amy Murphy, Dalton Hance, Scott D. Fielding
Individual-based ecological particle tracking model (ECO-PTM) for simulating juvenile chinook salmon migration and survival through the Sacramento – San Joaquin Delta Individual-based ecological particle tracking model (ECO-PTM) for simulating juvenile chinook salmon migration and survival through the Sacramento – San Joaquin Delta
Recovery of endangered salmon species in the Central Valley of California amidst prolonged drought and climate change necessitates innovative water management actions that balance species recovery and California's water demands. We describe an individual-based ecological particle tracking model (ECO-PTM) that can be used to assess the efficacy of proposed actions. Based on a random walk...
Authors
Xiaochun Wang, Russell W. Perry, Adam Pope, Doug Jackson, Dalton Hance
Survival implications of diversion entrainment for outmigrating juvenile Chinook Salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss) Survival implications of diversion entrainment for outmigrating juvenile Chinook Salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss)
Efforts to ameliorate negative effects of diversion dams on aquatic species of concern are important in rivers where water withdrawal supports agricultural economies and are likely to become increasingly important with impending climate change. A multiyear study was conducted to evaluate the survival consequences of diversion dam passage for juvenile Chinook Salmon (Oncorhynchus...
Authors
Tobias J. Kock, Scott D. Evans, Russell Perry, Patrick A. Monk, Michael S. Porter, Amy C. Hansen, Adam Pope
Spatial and temporal overlap between hatchery- and natural-origin steelhead and Chinook salmon during spawning in the Klickitat River, Washington, USA Spatial and temporal overlap between hatchery- and natural-origin steelhead and Chinook salmon during spawning in the Klickitat River, Washington, USA
A goal of many segregated salmonid hatchery programs is to minimize potential interbreeding between hatchery- and natural-origin fish. To assess this on the Klickitat River, Washington, USA, we used radiotelemetry during 2009–2014 to evaluate spatiotemporal spawning overlap between hatchery-origin and natural-origin steelhead Oncorhynchus mykiss and spring Chinook Salmon O. tshawytscha...
Authors
Joseph S. Zendt, Brady Allen, Tobias J. Kock, Russell Perry, Adam Pope
Simulating the migration dynamics of juvenile salmonids through rivers and estuaries using a hydrodynamically driven enhanced particle tracking model Simulating the migration dynamics of juvenile salmonids through rivers and estuaries using a hydrodynamically driven enhanced particle tracking model
Juvenile salmonids migrate hundreds of kilometers from their natal streams to mature in the ocean. Throughout this migration, they respond to environmental cues such as local water velocities and other stimuli to direct and modulate their movements, often through heavily modified riverine and estuarine habitats. Management strategies in an uncertain future of climate change and altered...
Authors
Vamsi Krishna Sridharan, Doug Jackson, Andrew M. Hein, Russell Perry, Adam Pope, Noble Hendrix, Eric M. Danner, Steven T. Lindley
Science and Products
Acoustic-tagged juvenile Chinook salmon (Oncorhynchus tshawytscha), steelhead (O. mykiss), and sockeye salmon (O. nerka) detections in the Yakima River, Washington, 2018-2024 (version 1.1, September 2025) Acoustic-tagged juvenile Chinook salmon (Oncorhynchus tshawytscha), steelhead (O. mykiss), and sockeye salmon (O. nerka) detections in the Yakima River, Washington, 2018-2024 (version 1.1, September 2025)
Juvenile Chinook salmon (age 0 and age 1), steelhead, and sockeye salmon were tagged with acoustic transmitters and released at sites along the Yakima River in and below Yakima, WA from 2018 to 2024. Detection sites varied across years but included arrays placed at diversion dams, canals, hydropower facilities, and other locations throughout the Yakima and Columbia rivers. Study design...
The North Delta Routing and Survival Management Tool The North Delta Routing and Survival Management Tool
Understanding how routing modifications influence survival of juvenile salmon is complex because reach-specific survival and routing at key river junctions in the North Delta each have a different relationship with river flow. Therefore, to facilitate understanding of how routing modifications at key river junctions influence through-Delta survival, we developed this spreadsheet model to...
Distribution and stomach contents of fishes in the northern Sacramento-San Joaquin Delta, 2020-2022 Distribution and stomach contents of fishes in the northern Sacramento-San Joaquin Delta, 2020-2022
This data set includes count, location, and ancillary habitat data for fishes sampled in adjacent reaches of Georgiana Slough, Sacramento River, and Steamboat Slough in the northern Sacramento-San Joaquin Delta. It also includes data on the stomach contents of selected individual black basses (Micropterus). Fishes were sampled by boat electrofishing from approximately January-May, 2020...
Filter Total Items: 24
Survival, travel time, and use of migration routes by juvenile steelhead in a modified river estuary Survival, travel time, and use of migration routes by juvenile steelhead in a modified river estuary
Greater understanding of the survival, travel time, and spatial distribution of juvenile salmonids among migration routes between their natal streams and the ocean is critical to the recovery of these threatened species. In the Sacramento–San Joaquin River Delta (Delta), a highly modified estuary in central California, USA, there is a critical need to evaluate how water management (e.g...
Authors
Adam Pope, Russell Perry, Dalton Hance, Rebecca A. Buchanan
Using parentage-based tagging to estimate survival of Chinook salmon fry in a large storage reservoir Using parentage-based tagging to estimate survival of Chinook salmon fry in a large storage reservoir
Research efforts focusing on salmonid populations have highlighted the need to better understand demographic parameters for the fry and parr life stages. Monitoring these small fish presents a challenge because negative effects from handling and tagging can bias subsequent parameter estimates. Removal models and associated sampling designs represent one class of mark-recapture models...
Authors
Adam Pope, Tobias J. Kock, Russell Perry, Karen M. Cogliati, Kathleen G. O'Malley, Christina Amy Murphy, Dalton Hance, Scott D. Fielding
Individual-based ecological particle tracking model (ECO-PTM) for simulating juvenile chinook salmon migration and survival through the Sacramento – San Joaquin Delta Individual-based ecological particle tracking model (ECO-PTM) for simulating juvenile chinook salmon migration and survival through the Sacramento – San Joaquin Delta
Recovery of endangered salmon species in the Central Valley of California amidst prolonged drought and climate change necessitates innovative water management actions that balance species recovery and California's water demands. We describe an individual-based ecological particle tracking model (ECO-PTM) that can be used to assess the efficacy of proposed actions. Based on a random walk...
Authors
Xiaochun Wang, Russell W. Perry, Adam Pope, Doug Jackson, Dalton Hance
Survival implications of diversion entrainment for outmigrating juvenile Chinook Salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss) Survival implications of diversion entrainment for outmigrating juvenile Chinook Salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss)
Efforts to ameliorate negative effects of diversion dams on aquatic species of concern are important in rivers where water withdrawal supports agricultural economies and are likely to become increasingly important with impending climate change. A multiyear study was conducted to evaluate the survival consequences of diversion dam passage for juvenile Chinook Salmon (Oncorhynchus...
Authors
Tobias J. Kock, Scott D. Evans, Russell Perry, Patrick A. Monk, Michael S. Porter, Amy C. Hansen, Adam Pope
Spatial and temporal overlap between hatchery- and natural-origin steelhead and Chinook salmon during spawning in the Klickitat River, Washington, USA Spatial and temporal overlap between hatchery- and natural-origin steelhead and Chinook salmon during spawning in the Klickitat River, Washington, USA
A goal of many segregated salmonid hatchery programs is to minimize potential interbreeding between hatchery- and natural-origin fish. To assess this on the Klickitat River, Washington, USA, we used radiotelemetry during 2009–2014 to evaluate spatiotemporal spawning overlap between hatchery-origin and natural-origin steelhead Oncorhynchus mykiss and spring Chinook Salmon O. tshawytscha...
Authors
Joseph S. Zendt, Brady Allen, Tobias J. Kock, Russell Perry, Adam Pope
Simulating the migration dynamics of juvenile salmonids through rivers and estuaries using a hydrodynamically driven enhanced particle tracking model Simulating the migration dynamics of juvenile salmonids through rivers and estuaries using a hydrodynamically driven enhanced particle tracking model
Juvenile salmonids migrate hundreds of kilometers from their natal streams to mature in the ocean. Throughout this migration, they respond to environmental cues such as local water velocities and other stimuli to direct and modulate their movements, often through heavily modified riverine and estuarine habitats. Management strategies in an uncertain future of climate change and altered...
Authors
Vamsi Krishna Sridharan, Doug Jackson, Andrew M. Hein, Russell Perry, Adam Pope, Noble Hendrix, Eric M. Danner, Steven T. Lindley