Male Bluethroat on the Seward Peninsula, Alaska. This photo was taken on the Seward Peninsula as part of the Changing Arctic Ecosystem Boreal-Arctic Transition Zone program.
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Male Bluethroat on the Seward Peninsula, Alaska
Male Bluethroat on the Seward Peninsula, Alaska. This photo was taken on the Seward Peninsula as part of the Changing Arctic Ecosystem Boreal-Arctic Transition Zone program.
Merrimac River, Missouri
The Missouri Department of Conservation is frequently queried regarding the general status of endangered and threatened mussels in Missouri, a question that will remain incompletely answered until a sufficiently rigorous and comprehensive assessment and monitoring framework is implemented in Missouri.
The Missouri Department of Conservation is frequently queried regarding the general status of endangered and threatened mussels in Missouri, a question that will remain incompletely answered until a sufficiently rigorous and comprehensive assessment and monitoring framework is implemented in Missouri.
Night Sampling
USGS Fish Biologist Dave Combs searches through net contents for larval fish during night sampling on the Upper Missouri River.
USGS Fish Biologist Dave Combs searches through net contents for larval fish during night sampling on the Upper Missouri River.
Night Sampling Boat
USGS fish biologist Dr. Pat Braaten and student contractor Garrett Cook inspect contents of a larval fish net during night sampling on the Upper Missouri River.
USGS fish biologist Dr. Pat Braaten and student contractor Garrett Cook inspect contents of a larval fish net during night sampling on the Upper Missouri River.
Fluorometer Retrieval
Research hydrologist Dr. Susannah Erwin retrieves fluorometer from the Upper Missouri River to download dye trace data.
Research hydrologist Dr. Susannah Erwin retrieves fluorometer from the Upper Missouri River to download dye trace data.
Hydraulic Habitat Assessment Boat
A U.S. Geological Survey hydraulic habitat assessment boat in not enough water.
A U.S. Geological Survey hydraulic habitat assessment boat in not enough water.
Boat Launch for Night Sampling
USGS fish biologists launch at sunset on the Upper Missouri River for a night of sampling for larval pallid sturgeon.
USGS fish biologists launch at sunset on the Upper Missouri River for a night of sampling for larval pallid sturgeon.
ADCP Boat
A US Geological Survey hydroacoustic survey boat measures velocity profiles on the Upper Missouri River.
A US Geological Survey hydroacoustic survey boat measures velocity profiles on the Upper Missouri River.
ADCP Data Review
Research hydrologist Dr. Susannah Erwin and hydrologic technician Brian Anderson inspect ADCP data on the Upper Missouri River.
Research hydrologist Dr. Susannah Erwin and hydrologic technician Brian Anderson inspect ADCP data on the Upper Missouri River.
Ichthyoplankton Sample
Typical contents of a net deployment showing larval fish, possibly pallid sturgeon.
Typical contents of a net deployment showing larval fish, possibly pallid sturgeon.
Processing a Drift Sample
Student Contractor Garrett Cook processes a drift sample collected on June 27 shortly after the free embryos and beads were released. Note the small cluster of pallid sturgeon free embryos and green beads in the lower portion of the sorting tray. These embryos and beads were elements of the Upper Missouri River drift experiment.
Student Contractor Garrett Cook processes a drift sample collected on June 27 shortly after the free embryos and beads were released. Note the small cluster of pallid sturgeon free embryos and green beads in the lower portion of the sorting tray. These embryos and beads were elements of the Upper Missouri River drift experiment.
Distribution of Free Embryos to Boats
Distribution of free embryos to boats in preparation for mass release.
Distribution of free embryos to boats in preparation for mass release.
Larval Release
Simultaneous mass release of 700,000 free embryos from boats distributed across the channel of the Upper Missouri River.
Simultaneous mass release of 700,000 free embryos from boats distributed across the channel of the Upper Missouri River.
Pre-Sample Briefing
Pre-deployment briefing for the Upper Missouri River Pallid Sturgeon Drift Study. Fish biologists and physical scientists from Montana Fish Wildlife and Parks, US Geological Survey, U.S. Fish and Wildlife Service, University of Montana, Nebraska Game and Parks Commission, and US Army Corps of Engineers go over the sample design and assignments.
Pre-deployment briefing for the Upper Missouri River Pallid Sturgeon Drift Study. Fish biologists and physical scientists from Montana Fish Wildlife and Parks, US Geological Survey, U.S. Fish and Wildlife Service, University of Montana, Nebraska Game and Parks Commission, and US Army Corps of Engineers go over the sample design and assignments.
Dye Preparation
USGS scientists prepare to mix rhodamine-WT dye for the dye trace experiment. The suits are to keep the harmless dye off of clothing.
USGS scientists prepare to mix rhodamine-WT dye for the dye trace experiment. The suits are to keep the harmless dye off of clothing.
Monitoring riparian vegetation along the Colorado River
Monitoring riparian vegetation along the Colorado RiverMonitoring riparian vegetation along the Colorado River downstream of Glen Canyon Dam
Monitoring riparian vegetation along the Colorado River
Monitoring riparian vegetation along the Colorado RiverMonitoring riparian vegetation along the Colorado River downstream of Glen Canyon Dam
Pallid Sturgeon Embryo
Developing pallid sturgeon embryo.
Developing pallid sturgeon embryo.
Pallid Sturgeon Embryo
Macro photo of a developing pallid sturgeon embryo. Developing embryo appears light gray
Macro photo of a developing pallid sturgeon embryo. Developing embryo appears light gray
Trout Movements on the Smith River, One of Montana's Most Important Recreational Fisheries
Trout Movements on the Smith River, One of Montana's Most Important Recreational FisheriesLed by Dr. Al Zale with the Montana Cooperative Fishery Research Unit at Montana State University, researchers Michael Lance and T. David Ritter are working closely with Montana Fish, Wildlife & Parks personnel, local landowners, and engineers to study salmonid movements in the popular Smith River system in central Montana.
Trout Movements on the Smith River, One of Montana's Most Important Recreational Fisheries
Trout Movements on the Smith River, One of Montana's Most Important Recreational FisheriesLed by Dr. Al Zale with the Montana Cooperative Fishery Research Unit at Montana State University, researchers Michael Lance and T. David Ritter are working closely with Montana Fish, Wildlife & Parks personnel, local landowners, and engineers to study salmonid movements in the popular Smith River system in central Montana.
Sleeping Bear Dunes, Michigan
The USGS monitors water quality at the Sleeping Bear Dunes National Lakeshore in Empire, Michigan.
The USGS monitors water quality at the Sleeping Bear Dunes National Lakeshore in Empire, Michigan.
Sleeping Bear Dunes National Lakeshore
The USGS monitors water quality at the Sleeping Bear Dunes National Lakeshore in Empire, Michigan.
The USGS monitors water quality at the Sleeping Bear Dunes National Lakeshore in Empire, Michigan.