This table shows the results of the spatial pattern analysis in juvenile (≤5 y of age) and adult mussels across 4 navigation pools (3, 5, 6, and 18) in the Upper Mississippi River. Mussel distributions were classified as patchily distributed, randomly distributed, or having a gradient pattern.
Example of hot-spot maps of adult (left) and juvenile (right) mussels in Navigation Pool 5 of the Upper Mississippi River. The size of the dots represent the number of mussels per square meter of the river bottom—with larger dots representing more dense mussel assemblages. Hot spots (red) indicate where sites of high mussel...
The flathead catfish, which is native to the Mississippi Basin, has been sighted in the Carolinas and could be spread by Hurricane Florence's floodwaters. It could affect the abundance of popular native fish like bass. Credit: Eric Engbretson, USFWS, public domain.
Cores were collected from various areas of thawing permafrost-peatlands in Alaska. Permafrost thaw results in ground subsidence and inundation that kills black spruce and other understory plants living on the permafrost plateau.
The beach-dependent shorebirds project at the Woods Hole Coastal and Marine Science Center models current and future habitat availability for nesting shorebirds in an effort to map current and likely future habitat availability on a range of sites along the U.S. Atlantic coast. Sites include beaches with minimal human-presence, such Cedar Island...
This map shows the distribution of confirmed and suspected cases of WNS across the U.S. WNS is a disease of hibernating bats that as spread from the northeastern to the central United States at an alarming rate.
The Cape Sable seaside sparrow in Everglades National Park. Photograph by David A. La Puma, New Jersey Audubon, from Wikimedia Commons, https://commons.wikimedia.org/wiki/File:CSSS1.jpg, licensed under the Creative Commons Attribution 3.0 Unported license.
U.S. Geological Survey Fact Sheet 2017–3069
Version 1.1, January 2018
Top row, left to right: Cordell Johnson (left) and Evan Dailey use the USGS R/V Fast Eddy to collect water samples. Cordell Johnson (left) and Jessie Lacy prepare to deploy a tripod holding instruments to measure water level, currents, and suspended sediment. USGS divers Jenny McKee (left) and...
Can you hear the difference between the non-native Cuban treefrog and two common Louisiana native treefrogs? Cuban treefrogs’ call is distinctive. Biologist Paul Moler of the Florida Fish and Wildlife Conservation Commission recorded them in South Florida. Credit: Paul Moler, used with permission.