2015-09-23

The Eurasian otter (Lutra lutra) population in Sweden went through a drastic decline in population size between the 1950s and 1980s, caused mostly by

This important new book Sammanfattning : In the 1950s the otter started to decline in numbers and distribution in Sweden and other parts of Europe. In 1972 a game law came into force, The situation of the otter population in Sweden; Erlinge, S. 1971. (1994) PCBs in European Otter (Lutra Lutra) Populations; Smit, M.D.1 Leonards, P.E.G.2 Van Hitta perfekta Otter Uk bilder och redaktionellt nyhetsbildmaterial hos Getty Images. Välj mellan 1 217 premium Otter Uk av högsta kvalitet.

Otter population

Only 25 Jan 7, 2020 San Francisco Bay could triple the state's threatened sea otter population, but has its own complications, according to a new study. Inquisitive, formidable and endangered, giant otters are luring tourists by the is surveying the otter population for CI and is dressed in python-skin fatigues. Sep 23, 2014 For southern sea otters to be considered for removal from the threatened species list, the population index would have to exceed 3,090 for three Jan 21, 2019 Following international legal protection in 1911, sea otter populations began the slow process of recovery and, by the mid-20th century, the Sea otters are a keystone species in kelp ecosystems, keeping sea urchin populations in check, while also eating snails, squid, octopuses, and clams among Our mission: To restore a healthy population of sea otters to the Oregon coast methods of restoring and protecting a healthy sea otter population in Oregon. The North American river otter is a member of the mustelid or weasel family that of the release sites in western New York had been devoid of otter populations Otter facts - sea otters and river otters have different lifestyles, but both species love Attacks like this occur generally within the California sea otter population.

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Thus, there has been a painfully gradual increase in the population of southern sea otters and according to a 2017 counting, these otters are numbered around 3,186. There were about 474 stranded otters in 2016.

Sea otter numbers have declined in southwestern Alaska over the past 20 years. Once containing more than half of the world’s sea otters, this population segment, which ranges from Kodiak Island through the western Aleutian Islands, has undergone an overall population decline of at least 55–67 percent since the mid-1980s. River otters have been blamed for decimating game fish populations and are seen as a pest to eradicate by many game fishermen. Recent research, however, indicates that otters prefer slower moving, easier to catch fish, such as suckers and catfish found along river bottoms, and pose no threat to game fish. The model suggests that the population declined when harvest rates exceeded 13% of the preharvest season population. Harvest exceeded that level in most years during 1994-2006.

The southern sea otter was widely believed to be extinct due to the expansive fur trade of the 18th and 19th centuries, which reduced the global population from between 150,000 and 300,000 to roughly 2,000.
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The sea otter population in Prince William Sound was also hit hard by the Exxon Valdez oil spill, which killed thousands of sea otters in 1989.

Cases of sea otters with morbilliviral infection without histologic changes could represent early infections or incompletely cleared sublethal infections. We found that morbillivirus was present in the Washington sea otter population as early as 2000, and we provide a description of the pathology of canine distemper in sea otters. Sea otter population declines again — and great white sharks are among the culprits The California southern sea otter population decreased this year, a study by the state Department of Fish and Wildlife and US Geological Survey shows.
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Ecological Bulletins 48 av J Truve · 2012 — Several carnivores, i.e. lynx, fox and otter show a positive growth rate in both areas.