Images

The lakeside gates of the Port Mayaca Navigational Lock in their closed position.
Lake Okeechobee lies beyond the gates.

Ryan’s thesis research focuses on the importance of appropriate spawning substrate as a key driver of paddlefish restoration success in reservoirs of Oklahoma. Paddlefish, an important sportfish, have been stocked in reservoirs throughout the State, but these stocking efforts have had variable success.

An alligator sunning itself along the banks of a canal, in Big Cypress National
Preserve.

Red-faced warblers are one of the species affected by climate change in the form of reduced snowpack in the Arizona Mountains, according to a USGS Montana Cooperative Wildlife Research Unit study.

Several red mangrove "islands" in an intracoastal waterway. Photograph taken circa 1998.

Cecioides consobrinus shell viewed with a scanning electron microscope with aperture facing up.

Juvenile white sturgeons on measuring board.

A classic marine tide pool environment among some of the black lava rocks found on the southern shore of Maui in the Hawaiian islands.

A classic marine tide pool environment among some of the black lava rocks found on the southern shore of Maui in the Hawaiian islands.

Rainstorm over Kauai mountains and Hanalei Bay at the North Shore of Kauai.

Endangered Hawai'i forest bird, 'Akiapōlā‘au (Hemignathus munroi).

For a behavioral study of Crossarchus obscurus, the long-nosed cusimanse, in Tiwai Island Wildlife Sanctuary, Sierra Leone, West Africa, fishing nets were the most successful method of capturing an entire group of these mongooses, compared to baited live-traps and thatch fences (which channeled animals into live traps, and which were moderately successful).

Image scan of a historical bird migration card.

Image scan of a historical bird migration card.

Image scan of a historical bird migration card.

Image scan of a historical bird migration card (1904).

This image was taken in 1889 by Nims on Stanton's Colorado River survey trip.

Jackson elk herd migrations around the National Elk Refuge are shown in dark blue (short-distant migrants) and light blue (long-distant migrants). Elk migrations cross federal, state, and public lands. The map was generated by the USGS using data from the USGS Data Release Kauffman and others, 2020. 

The red color is due to the abundance of this organism; the red is due to the presence of astaxanthin, a pigment in the cells.

Wyoming Cooperative Fish and Wildlife Research Unit - Laura Linn checking for ticks and Scott Becker calling helicopter during moose captures in the Buffalo Valley, Wyoming.

The USGS researches land use and honey bee health in the northern Great Plains. This research will be useful in equipping land managers and policy makers with the best-available science to improve forage and habitat for pollinators in a part of the country that is undergoing rapid land-use change.