Aerial views of streams on the west side of Cook Inlet, Alaska. This was during surveys for juvenile salmon distribution for the Anadromous Fish Catalog for the State of Alaska.
Christian E Zimmerman, Ph.D.
Actionable science to inform decision makers, managers, and the public
Science and Products
Filter Total Items: 17
Lake Trout Biochronologies as Long-term Climate and Productivity Indicators in Alaska Lake Ecosystems
High latitude ecosystems are among the most vulnerable to long-term climate change, yet continuous, multidecadal indicators by which to gauge effects on biology are scarce, especially in freshwater environments.
Hydro-Ecology of Arctic Thawing (HEAT): Ecology
Permafrost thaw is leading to a myriad of changes in physical and chemical conditions throughout the Arctic.
Effect of Elodea spp. on Fish Performance Mediated Through Food Web Interactions
The potential for invasive species introductions in Arctic and Subarctic ecosystems is growing as climate change manifests and human activity increases in high latitudes.
Sockeye Salmon Migrating at the Northern Edge of Their Distribution
The physiological challenge for anadromous fish to migrate upriver to spawn and complete their life cycle is influenced by river temperature.
Arctic Coastal Plain Studies
The Arctic Coastal Plain (ACP) is a large region of low-lying, lake-rich land on the North Slope of Alaska. This region is underlain by thick ground ice, which is susceptible to erosion and thaw. These physical changes are likely to alter ecosystems by changing the availability of habitats and food resources upon which wildlife depends. Our studies on the ACP aim to understand the link between...
Filter Total Items: 65
An aerial view of a tributary to Lake Clark, Alaska
Aerial views of streams on the west side of Cook Inlet, Alaska. This was during surveys for juvenile salmon distribution for the Anadromous Fish Catalog for the State of Alaska.
A tributary of Lake Clark, Alaska
Aerial views of streams on the west side of Cook Inlet, Alaska. This was during surveys for juvenile salmon distribution for the Anadromous Fish Catalog for the State of Alaska.
Aerial views of streams on the west side of Cook Inlet, Alaska. This was during surveys for juvenile salmon distribution for the Anadromous Fish Catalog for the State of Alaska.
Upper Crescent River, Alaska
Upper Crescent River on the west side of Cook Inlet, Alaska. Surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
Upper Crescent River on the west side of Cook Inlet, Alaska. Surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
The Drift River near Redoubt Volcano after the 2009 eruption
Aerial surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
Aerial surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
Drift River lahars after the Redoubt Volcano 2009 eruption
Drift River on the west side of Cook Inlet, Alaska. Lahars from the eruption of Redoubt are evident. Aerial surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
Drift River on the west side of Cook Inlet, Alaska. Lahars from the eruption of Redoubt are evident. Aerial surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
A section of open water on the Nome River, Alaska
Using remote sensing through the ice to determine how much water was in the Nome River in the winter. Some spots were open to the air.
Using remote sensing through the ice to determine how much water was in the Nome River in the winter. Some spots were open to the air.
Ice sampling on the Nome River, Alaska
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Drilling a hole in the ice on the Nome River, Alaska
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Tanana River winter water sampling
Water sampling on the Tanana River. Notice the poles of the piezometers installed in the river. This project was to see chum salmon spawning habitat in the winter.
Water sampling on the Tanana River. Notice the poles of the piezometers installed in the river. This project was to see chum salmon spawning habitat in the winter.
Tanana River winter water sampling
Biologist standing in the Tanana River sampling the open water. This project was to see chum salmon spawning habitat in the winter.
Biologist standing in the Tanana River sampling the open water. This project was to see chum salmon spawning habitat in the winter.
Tanana River salmon eggs in the gravel in November 2008
Chum salmon eggs in the gravel in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Chum salmon eggs in the gravel in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Biologists looking over the Tanana River in November, 2008
Biologists looking from a bluff over the Tanana River in November 2008. This project was to see chum salmon spawning habitat in the winter.
Biologists looking from a bluff over the Tanana River in November 2008. This project was to see chum salmon spawning habitat in the winter.
Biologist reading water sampling meter during winter Tanana River work
Biologist reading water meter in the Tanana River in November, 2008. This project was to see chum salmon spawning habitat in the winter.
Biologist reading water meter in the Tanana River in November, 2008. This project was to see chum salmon spawning habitat in the winter.
Biologist getting ready for Tanana River sampling in November, 2008
Biologist standing next to the shore getting ready to sample water in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Biologist standing next to the shore getting ready to sample water in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Helicopter used for transportation on Tanana River winter sampling
A helicopter used to transport personnel to the Tanana River to winter sample chum salmon spawning habitat.
A helicopter used to transport personnel to the Tanana River to winter sample chum salmon spawning habitat.
The northern lights over the Selawik River, Alaska
The northern lights over the Selawik River, Alaska
The northern lights over the Selawik River, Alaska
Sheefish eggs from the Selawik River, Alaska
Sheefish eggs in a vial from the Selawik River, Alaska
Sheefish eggs in a vial from the Selawik River, Alaska
A close up of a moose on the Selawik River, Alaska
A moose on the shore of the Selawik River. This moose was present during the Sheefish sediment impact study field work.
A moose on the shore of the Selawik River. This moose was present during the Sheefish sediment impact study field work.
Clipping a sheefish fin in the Selawik River
Biologists clip the tip of one of the ventral fins of a sheefish that is in a cradle in the Selawik River, Alaska. This study was collecting genetic samples to help find impacts of fine sediment on sheefish. The results were no impacts due to low amounts of sediments present.
Biologists clip the tip of one of the ventral fins of a sheefish that is in a cradle in the Selawik River, Alaska. This study was collecting genetic samples to help find impacts of fine sediment on sheefish. The results were no impacts due to low amounts of sediments present.
The Selawik River, Alaska
Scenic of the Selawik River
Caribou crossing the Selawik River, Alaska
Caribou crossing the Selawik River, Alaska
Caribou crossing the Selawik River, Alaska
Science and Products
Filter Total Items: 17
Lake Trout Biochronologies as Long-term Climate and Productivity Indicators in Alaska Lake Ecosystems
High latitude ecosystems are among the most vulnerable to long-term climate change, yet continuous, multidecadal indicators by which to gauge effects on biology are scarce, especially in freshwater environments.
Hydro-Ecology of Arctic Thawing (HEAT): Ecology
Permafrost thaw is leading to a myriad of changes in physical and chemical conditions throughout the Arctic.
Effect of Elodea spp. on Fish Performance Mediated Through Food Web Interactions
The potential for invasive species introductions in Arctic and Subarctic ecosystems is growing as climate change manifests and human activity increases in high latitudes.
Sockeye Salmon Migrating at the Northern Edge of Their Distribution
The physiological challenge for anadromous fish to migrate upriver to spawn and complete their life cycle is influenced by river temperature.
Arctic Coastal Plain Studies
The Arctic Coastal Plain (ACP) is a large region of low-lying, lake-rich land on the North Slope of Alaska. This region is underlain by thick ground ice, which is susceptible to erosion and thaw. These physical changes are likely to alter ecosystems by changing the availability of habitats and food resources upon which wildlife depends. Our studies on the ACP aim to understand the link between...
Filter Total Items: 65
An aerial view of a tributary to Lake Clark, Alaska
Aerial views of streams on the west side of Cook Inlet, Alaska. This was during surveys for juvenile salmon distribution for the Anadromous Fish Catalog for the State of Alaska.
Aerial views of streams on the west side of Cook Inlet, Alaska. This was during surveys for juvenile salmon distribution for the Anadromous Fish Catalog for the State of Alaska.
A tributary of Lake Clark, Alaska
Aerial views of streams on the west side of Cook Inlet, Alaska. This was during surveys for juvenile salmon distribution for the Anadromous Fish Catalog for the State of Alaska.
Aerial views of streams on the west side of Cook Inlet, Alaska. This was during surveys for juvenile salmon distribution for the Anadromous Fish Catalog for the State of Alaska.
Upper Crescent River, Alaska
Upper Crescent River on the west side of Cook Inlet, Alaska. Surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
Upper Crescent River on the west side of Cook Inlet, Alaska. Surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
The Drift River near Redoubt Volcano after the 2009 eruption
Aerial surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
Aerial surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
Drift River lahars after the Redoubt Volcano 2009 eruption
Drift River on the west side of Cook Inlet, Alaska. Lahars from the eruption of Redoubt are evident. Aerial surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
Drift River on the west side of Cook Inlet, Alaska. Lahars from the eruption of Redoubt are evident. Aerial surveys were done after the eruption of the Redoubt volcano to determine the condition of fish streams.
A section of open water on the Nome River, Alaska
Using remote sensing through the ice to determine how much water was in the Nome River in the winter. Some spots were open to the air.
Using remote sensing through the ice to determine how much water was in the Nome River in the winter. Some spots were open to the air.
Ice sampling on the Nome River, Alaska
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Drilling a hole in the ice on the Nome River, Alaska
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Tanana River winter water sampling
Water sampling on the Tanana River. Notice the poles of the piezometers installed in the river. This project was to see chum salmon spawning habitat in the winter.
Water sampling on the Tanana River. Notice the poles of the piezometers installed in the river. This project was to see chum salmon spawning habitat in the winter.
Tanana River winter water sampling
Biologist standing in the Tanana River sampling the open water. This project was to see chum salmon spawning habitat in the winter.
Biologist standing in the Tanana River sampling the open water. This project was to see chum salmon spawning habitat in the winter.
Tanana River salmon eggs in the gravel in November 2008
Chum salmon eggs in the gravel in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Chum salmon eggs in the gravel in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Biologists looking over the Tanana River in November, 2008
Biologists looking from a bluff over the Tanana River in November 2008. This project was to see chum salmon spawning habitat in the winter.
Biologists looking from a bluff over the Tanana River in November 2008. This project was to see chum salmon spawning habitat in the winter.
Biologist reading water sampling meter during winter Tanana River work
Biologist reading water meter in the Tanana River in November, 2008. This project was to see chum salmon spawning habitat in the winter.
Biologist reading water meter in the Tanana River in November, 2008. This project was to see chum salmon spawning habitat in the winter.
Biologist getting ready for Tanana River sampling in November, 2008
Biologist standing next to the shore getting ready to sample water in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Biologist standing next to the shore getting ready to sample water in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Helicopter used for transportation on Tanana River winter sampling
A helicopter used to transport personnel to the Tanana River to winter sample chum salmon spawning habitat.
A helicopter used to transport personnel to the Tanana River to winter sample chum salmon spawning habitat.
The northern lights over the Selawik River, Alaska
The northern lights over the Selawik River, Alaska
The northern lights over the Selawik River, Alaska
Sheefish eggs from the Selawik River, Alaska
Sheefish eggs in a vial from the Selawik River, Alaska
Sheefish eggs in a vial from the Selawik River, Alaska
A close up of a moose on the Selawik River, Alaska
A moose on the shore of the Selawik River. This moose was present during the Sheefish sediment impact study field work.
A moose on the shore of the Selawik River. This moose was present during the Sheefish sediment impact study field work.
Clipping a sheefish fin in the Selawik River
Biologists clip the tip of one of the ventral fins of a sheefish that is in a cradle in the Selawik River, Alaska. This study was collecting genetic samples to help find impacts of fine sediment on sheefish. The results were no impacts due to low amounts of sediments present.
Biologists clip the tip of one of the ventral fins of a sheefish that is in a cradle in the Selawik River, Alaska. This study was collecting genetic samples to help find impacts of fine sediment on sheefish. The results were no impacts due to low amounts of sediments present.
The Selawik River, Alaska
Scenic of the Selawik River
Caribou crossing the Selawik River, Alaska
Caribou crossing the Selawik River, Alaska
Caribou crossing the Selawik River, Alaska