Ecosystems

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Eel electrosensitivity test apparatus
December 31, 2019

Eel electrosensitivity test apparatus

Apparatus used to test the sensitivity of eels to low-voltage pulsed DC electric fields. Knowledge of sensitivity of eels to electric fields enables development of behavioral barriers that use electricity to guide eels away from turbine intakes.

Grass carp larvae
December 31, 2019

Grass carp larvae

These images show grass carp larvae from the Maumee River. Characteristics of larval grass carp include overall length (left), skeletal muscle development (center) and presence of an eye spot that lacks pigmentation (right; pigment starting to develop on lower eye).

Eel climbing substrate
December 31, 2019

Eel climbing substrate

Left: Prototype ABS plastic eel climbing ramp under development and testing at CAFRL. New substrate design allows for passage of a wider size range of eels with less need for precise flow regulation. Right: juvenile eel climbing wetted ABS plastic substrate.

USA-NPN Pheno Forecast of emerald ash borer adult emergence.
December 31, 2019

USA-NPN Pheno Forecast of emerald ash borer adult emergence.

USA-NPN Pheno Forecast of emerald ash borer adult emergence. Yellow areas indicate locations that will have reached the accumulated temperature requirements for adult emergence as of April 1, 2019.

Release of radio-tagged silver phase American Eel
December 31, 2019

Release of radio-tagged silver phase American Eel

Radio-tagged silver phase American Eels being released for a CAFRL telemetry study of downstream passage of eels at hydroelectric dams on the Shetucket River, Connecticut.

Eel airlift bypass prototype
December 31, 2019

Eel airlift bypass prototype

Prototype design of an airlift developed at CAFL to transport downstream migrant eels through a bypass pipe and away from turbine intakes. The airlift design passes eels as well as a conventional siphon or gravity pipe.

Map of locations of the 16 Ecosystems Science Centers and 40 Cooperative Research Units across the U.S.
September 17, 2019

Ecosystems Science Centers and Cooperative Research Units

Map of locations of the 16 Ecosystems Science Centers and 40 Cooperative Research Units across the U.S.

Attribution: Ecosystems
An invasive Cuban treefrog in New Orleans, LA.
August 23, 2019

Outstanding in the Field (Ep 4): Amphibian Surveys – Call of the Frog

The USGS Ecosystems Mission Area brings you Outstanding in the Field, a series of stories about our science, our adventures, and our efforts to better understand our fish and wildlife and the ecosystems that support them. In this episode we describe the USGS’s efforts to track frog populations in the southeast United States. 
 

Columbia torrent salamander
August 5, 2019

Columbia torrent salamander (Rhyacotriton kezeri)

Torrent salamanders are Northwest-U.S. endemic, headwater-stream-associated amphibian species that have a dearth of basic ecological information, but are thought to be highly vulnerable to habitat changes. This taxon currently has two candidates for listing by the Endangered Species Act: the Cascade torrent salamander (Rhyacotriton cascadae) and the Columbia

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August 5, 2019

Surfing the Green Wave

Mule deer are an important part of the Western landscape and are coveted among big-game hunters throughout the country. These animals draw outdoor enthusiasts to states, such as Wyoming, where nearly 800,000 people hunted, fished, and viewed wildlife, and contributed $1.1 billion to the state’s economy. Balancing a growing infrastructure in the west that includes housing

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Attribution: Ecosystems
Woman in a jacket and hat drives a boat on the ocean
July 19, 2019

Driving a seabird survey vessel off the Central California Coast

USGS scientist Emma Kelsey drives a survey vessel off the Central California Coast as part of a seabird survey.

In collaboration with California State Parks, USGS Western Ecological Research Center biologists are conducting at-sea surveys of  the Marbled Murrelet (Brachyramphus marmoratus), a small endangered seabird, to estimate abundance, distribution and

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