Sea Otter Survey Encouraging, But Comes Up Short Of The ‘Perfect Story’
(Click to enlarge) A sea otter in Morro Bay, Calif. (AP Photo/Reed Saxon, File)
The southern sea otter, Enhydra lutris nereis, continues its climb toward recovery, according to the annual count released by the U.S. Geological Survey and partners today. For the first time, southern sea otters’ numbers have exceeded the threshold required by the U.S. Fish and Wildlife Service to consider de-listing the species as “threatened” under the Endangered Species Act. The annual count will need to surpass this threshold for the next two years for USFWS to review the otters’ listed status. However, localized population declines at the northern and southern ends of the range continue to be a cause for concern among resource management officials.
(From ScienceDaily)– This year’s survey results suggest an increasing trend over the last five years of more than 3 percent per year. The population index, a statistical representation of the entire population calculated as the three-year running average of census counts, has climbed to 3,272, up from 2,939 in 2013. The growth is accounted for by an unexpected jump in numbers in the center of the sea otter’s range, an area that spans the Californian coast from Monterey south to Cambria.
“We believe the high count this year is partly explained by excellent viewing conditions, but it also appears to reflect increased food availability in the range center,” says Dr. Tim Tinker, a research ecologist who leads the USGS sea otter research program. “The boom in sea urchin abundance throughout northern and central California has provided a prey bonanza for sea otters, and that means more pups and juveniles are surviving to adulthood.”
Read the full article here: https://www.sciencedaily.com/releases/2016/09/160920085532.htm