Images

A threatened Waccamaw killifish from the Southeastern Atlantic Slope.

A threatened sicklefin redhorse from the Tennessee River.

An endangered holiday darter (Amicalola population). Darters are among the most threatened Southeastern fish; they have been likened to aquatic canaries.

An endangered Alabama sturgeon from the Mobile River.

An endangered holiday darter (Amicalola population). Darters are among the most threatened Southeastern fish; they have been likened to aquatic canaries.

Aquatic plants typical of still waters, ponds, and shallow wetlands: duckweeds, water lettuce, and watermoss.

An endangered Alabama sturgeon from the Mobile River.

A threatened Waccamaw killifish from the Southeastern Atlantic Slope.

Aquatic ecosystems make a difference in the carbon cycle. The location in this photo is located near Beaver, Alaska approximately 100 miles north of Fairbanks.

The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'i—the most active volcano in the world.  The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.

The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'i—the most active volcano in the world.  The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.

The USGS Hawaiian Volcano Observatory is perched on the rim of Kilauea Volcano's summit caldera (next to the Thomas A. Jaggar Museum in Hawai'i Volcanoes National Park), providing a spectacular view of the active vent in Halema‘uma‘u Crater.

A meandering stream that was a possible biomonitoring site for a USGS project in North Dakota.

Polar bears along sea ice in the Arctic Ocean.

This is a view of Barrow, Alaska from a helicopter.

Scientists are preparing the Conductivity Temperature Depth Profiler (CTD) before it is placed in the Arctic Ocean to collect data.

U.S. Coast Guard member is preparing the Conductivity Temperature Depth Profiler (CTD) for deployment in the Arctic Ocean. The CTD collects water samples and measures conductivity and temperature as a function of water depth.

Polar bears along sea ice in the Arctic Ocean.

A Canadian helicopter pilot is discussing the helicopter's operations to U.S. Coast Guard members. The helicopter flew from the Canadian Coast Guard Ship Louis S. St. Laurent to the U.S. Coast Guard Cutter Healy. This is in the Arctic Ocean during a scientific expedition to map the seafloor.

The Conductivity Temperature Depth Profiler (CTD) is being lowered in the Arctic Ocean to collect water samples and measure conductivity and temperature as a function of water depth.

A member of the U.S. Coast Guard is preparing the Conductivity Temperature Depth Profiler (CTD) to be deployed in the Arctic Ocean to collect data.