Images

Seining for fish in open water necessitates closing the seine quickly to avoid fish escape.  Closing the seine around a pole offshore accomplishes this objective in sampling.

Sampling juvenile common snook following passage of Hurricane Wilma October 2005.  Storm surge from hurricane is hypothesized to have facilitated recruitment of this sportfish to presumptive Tarpon Bay nursery grounds in the following 18 months.

Pocosin  weather station site, Shenandoah National Park.

Stream in Great Smoky Mountains National Park.

Blocks of ice on Vitus Lake, Bering Glacier, Alaska.

Construction of the new Hwy 93 bypass over the Colorado River and the hydropower plant at Hoover Dam.

It's a baby songbird. It's cute and fuzzy.

Harrat Lunayyir basalt cinder cones and lava flows in Saudi Arabia seen from an aerial perspective. Deposits from the cinder cones cover nearby ridges and form fans at the base of the older non-volcanic ridge in the background. These well-preserved geomorphic forms indicate the relative youth of this northern part of the volcanic field.

Dart Poison Frogs are commonly found in Central and South America and are from the Dendrobatidae family.

Over the past several days, the lava surface within the vent in Halema'uma'u has occasionally, and temporarily, reached to within about 115 m (375 ft) below the floor of Halema'uma'u Crater, as seen in this photo. During these high-lava stands, the gas plume is generally fairly wispy, providing the rare naked-eye view of the lava surface.

Panorama of Pu'u 'O 'o crater from the south rim of Pu'u 'O 'o cone. Active lava flows (light gray) cover much of the crater floor and are erupting from the degassing vent at the far left.

Close-up view of the erupting vent in Pu'u 'O 'o crater. Lava is not visible because it is going directly into tubes beneath the crusted surface to the right and feeding small lava flows near the flow front.

Great Lakes water availability studies conducted by the U.S. Geological Survey aim to help characterize how much water the Basin has now, how water availability is changing, and how much water it can expect to have in the future.

Drought and climate change are causing extensive forest dieback in the U.S. West as well as worldwide. These photos show dead ponderosa pines in the Jemez Mountains of New Mexico killed by a combination of drought stress and attacks by bark beetles on weakened trees.

Souris River above Minot, North Dakota.

This is an image of a gas drilling rig in Colorado.

Diatoms are algae that reflect the biotic condition of streams, lakes and estuaries. Diatoms are important indicator organisms because they are sensitive to natural and human impacts, and monitoring their condition provides information about ecosystem health. A large, living Pleurosira laevis cell has many disc shaped chloroplasts.

Biologist holding a flathead catfish caught by trammel net in the Lower Missouri River.

Hydrogeologists examining the Garber-Wellington aquifer and Hennessey Shale confining unit contact near Arcadia Lake, Oklahoma.

Retrieving a trotline on the Lower Missouri River in March 2011.

An ultrasound is used to determine the reproductive condition of female pallid sturgeon.