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Reports & Publications

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Walrus radio-tracking in the northern Bering Sea 2008

USGS attached satellite radio-tags to 10 adult walruses (both males and females) to map walrus foraging locations within the St. Lawrence Island polynya. The radio-tags characterized hourly walrus foraging status and provided animal location estimates for 6 to 8 weeks. These data will be used with data from benthic samples collected in the same More...

  • Image of tagged walrus

Manatee Research (Sirenia Project)

Web page for the Sirenia Project, a USGS Florida Integrated Science Center project that conducts studies on the West Indian manatee (Trichechus manatus). Includes links to manatee research in the news, international research, publications and presentations, and project staff contact information.

  • close up of a manatee

Using Genetic Modeling to Assess the Health and Status of Manatee Populations

Biologists in the Sirenia Project at the U.S. Geological Survey (USGS) Florida Integrated Science Center (FISC) in Gainesville, FL, are currently identifying and mapping the genetic material of manatees. Their goal is to better understand and predict the manatee's ability to react to environmental stimuli, such as prolonged periods of cold More...

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Sea Otter Mortality

Recent increases in the frequency and variety of infectious diseases in the southern sea otter may jeopardize the population recovery of this threatened species. This information sheet includes a list of selected publications.

  • sea otter with its head poking out of the ocean

Sea Otter Studies at WERC

Sea otters (Enhydra lutris) are keystone predators in the nearshore environment of the eastern Pacific Ocean, in a food web composed of sea otter, sea urchin, and kelp forest. Without sea otters, the kelp forest can be overgrazed by sea urchins, which in turn can affect other species that depend on this ecosystem. This resource provides links to More...

  • A sea otter floats on its back while grooming

Quantitative Threats Analysis for the Florida Manatee (Trichechus manatus latirostris)

This report assesses and forecasts the status of the Florida manatee population over 50 to 150 years, and examines the relative roles that different threats play in determining the status of these marine mammals, in cooperation with scientists at the Florida Fish and Wildlife Conservation Commission's Fish and Wildlife Research Institute (FWC). More...

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Conservation Genetics Lab

The Conservation Genetics Lab carries out molecular analysis, pedigree analysis, modeling, data management, and cryogenic sample repository. As a part of this research, the lab investigates the effectiveness of molecular markers used to enhance enforcement of the Endangered Species Act policy. During the past 15 years, this research has involved More...

  • image of a frog (anura)

Process structuring coastal marine communities in Alaska: DOI trust resources

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.

  • two people with binoculars looking out onto a body of water from the shore

Hurricanes and Florida Manatees

Prior research on manatee (Trichechus manatus latirostris) survival in northwest Florida, based on markresighting photo-identification data from 1982?1998, showed that annual adult apparent survival rate was significantly lower during years with extreme storms. Mechanisms that we proposed could have led to lower estimates included stranding, More...

  • This map depicts the tracks of the hurricanes that impacted manatee habitat. Hurricanes Charley, Fra

Conservation Genetics: Mammals

This web page presents samples of genetics and genomics research from the USGS Biological Resources Discipline about the conservation genetics of mammals.

  • Underwater view of a manatee in Crystal River, Florida

Sea otter population status and changes in Alaska

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.

  • full body view of sea otter under water

Retrospective evaluation of Exxon Valdez oil spill Trustee Council sponsored sea otter studies

An extensive and diverse array of studies were implemented concurrent with and for several years following the Exxon Valdez oil spill to determine the acute and chronic effects to sea otters. In part, this paper describes what activities relative to sea otters should take place prior to, during, and following another spill similar to the Exxon More...

  • sea otter in ocean at time of oil spill