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USGS reports increase of sea otters in recent survey

The spring 2000 survey of 2,317 California sea otters indicates an overall increase by 10.9 percent since the 1999 spring survey of 2,090 individuals. This is the first overall increase observed since spring 1995, when the threatened population reached its highest number of 2,377 individuals. The breakdown of the 2000 survey shows a 13.8 percent increase in pups since spring 1999, and a 10.5 percent increase in adults and subadults, or independents.

The survey, conducted cooperatively by scientists of the U.S. Geological Survey, California Department of Fish and Game, Monterey Bay Aquarium, and with the help of experienced volunteers, covered about 375 miles of California coast, from Half Moon Bay south to Santa Barbara. The information gathered will be used by federal and state wildlife agencies in making decisions about the management of this sea mammal.

"While we are encouraged by the larger numbers, it is too soon to know if this signifies a true increase in population size," says USGS scientist Dr. James A. Estes in Santa Cruz, Calif. "Wildlife surveys are inherently imprecise and this is not the first time we have obtained counts that departed substantially from existing trends. Therefore, a sustained trend over the next several years will be required before we can say with any confidence that the period of decline is over."

Low population growth rate has long been a factor in the lagging recovery of the California sea otter, says Estes. The population of sea otters in central California increased this century at an average annual rate of about 5 percent until the mid-1970's, when growth ceased and the population began to decline. Following the state of California's emergency restrictions on set-net fishing, the population increased again until 1995, but has since declined. In 1977 the California sea otter was listed as threatened under the Endangered Species Act.

Disease, contaminants, starvation, and entanglement or entrapment in coasta
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Contact: Gloria Maender
gloria_maender@usgs.gov
520-670-5596
United States Geological Survey
10-Jun-2000


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