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Publisher: USGS | Science Center: Alaska Science Center (ASC, Anchorage) | Format: URL
www.absc.usgs.gov — A web page to introduce research by the USGS Alaska Science Center on sea otter population status and changes in Alaska. Provides some background on why the research is needed, research objectives, and a listing of publications by project staff.
Publisher: USGS | Science Center: Alaska Science Center (ASC, Anchorage) | Format: URL
www.absc.usgs.gov — An overview of research that looks at the interactions between sea otters and prey species, allowing an assessment of the effects that sea otters have on composition and productivity of coastal marine communities. Includes links to USGS publications resulting from this research.
Publisher: USGS | Science Center: National Wetlands Research Center (NWRC, Lafayette) | Format: URL
www.nwrc.usgs.gov — This resource provides links to resources that relate to the land changes and land loss of coastal Louisiana. Louisiana Coastal Land Loss was approximately 1,900 square miles, primarily coastal marshes, during the 20th century. Louisiana could lose another 700 square miles over the next 50 years if no new restoration takes place. By 2050, one More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — Fall chinook salmon (Oncorhynchus tshawytscha) in the Snake River are currently listed as threatened under the Endangered Species Act (ESA). Because fall chinook salmon migrate seaward during the summer when flows are low and water temperatures are high, their survival rate is lower. The goal of this study is to more clearly identify the More...
Publisher: USGS (Biological Science Office) | Science Center: Alaska Science Center (ASC, Anchorage) | Format: URL
www.absc.usgs.gov — This project was designed to assess whether or not populations are recovering, whether isolated processes constrain recovery, and the potential activities to facilitate recovery. This web resource provides links to background information on Nearshore Vertebrate Predators, the Sea Otter, the Harlequin Duck, the River Otter, and the Pigeon More...
Publisher: USGS | Science Center: Alaska Science Center (ASC, Anchorage) | Format: URL
www.absc.usgs.gov — The North Pacific Pelagic Seabird Database is an ongoing project between the USGS and Fish and Wildlife Service that addresses data on the pelagic distribution and abundance of seabirds. This project has collected data from researchers in Canada, Russia, and the U.S. (1972-2003). This information is critical for understanding the basic ecology of More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — As anadromous juvenile salmonids migrate from freshwater rearing habitats to the ocean, they are vulnerable to a host of factors that affect their survival. Direct effects associated with dam passage (e.g., instantaneous mortality, injury, loss of equilibrium, etc.) and indirect effects (e.g., predation, disease, and physiological stress) More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — As anadromous juvenile salmonids migrate from freshwater rearing habitats to the ocean, they are vulnerable to a host of factors that affect their survival. Direct effects associated with dam passage (e.g., instantaneous mortality, injury, loss of equilibrium, etc.) and indirect effects (e.g., predation, disease, and physiological stress) More...
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — This project is a fruitful approach to studying long-term changes in aquatic ecosystems through the use of sediment cores and the various types of indicators that can be extracted from these cores.
Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL
wfrc.usgs.gov — This study was conducted to investigate the inventory, relative abundance, and spatial distribution of fish inhabiting Abbots Lagoon, California. Distribution patterns of the fish were related to water quality or other environmental conditions in the lagoon. Specific objectives of this investigation were to (a) inventory the fish species More...
Publisher: USGS | Science Center: Columbia Environmental Research Center (CERC, Columbia) | Format: URL
www.cerc.usgs.gov — The ultraviolet radiation (UV) component of sunlight can pose a direct threat to aquatic flora and fauna. This issue overview describes the interactive effects of ultraviolet radiation on vertebrate and invertebrate organisms from freshwater and coastal habitats, and interactive effects of ultraviolet radiation on vertebrate and invertebrate More...
Publisher: USGS | Science Center: Western Ecological Research Center (WERC, Sacramento) | Format: URL
www.werc.usgs.gov — Once an abundant frog throughout much of central and southern California, the California red-legged frog (Rana draytonii) is now rare in the Sierra Nevada foothills and the southern portion of its range. In parts of the central Coast Range, however, large, vigorous populations do remain. Most protection efforts for this threatened species have More...
U.S. Department of the Interior |
U.S. Geological Survey