| Summary: | Mustela (Mustela) vison S с h r. inhabiting Sakhalin is considered. The animals escaping from the farms initiated the wild population of this species on Sakhalin as well a s on the. island Urup. From 1956 till 1970 564 individuals were delivered from the Khabarovsk and Altai regions and 198 individuals of Poronaiskian population were simultaneously settled. Now the animals inhabit to the south 50°N.L. , in the Rubnovskian district and on the island Urup. Ecological conditions for M. vison are not favourable, that is why the growth of quantity and its further migration over the Sakhalin lands is not observed. M. vison is an enemy of salmon fry. birds, muskra t and M. (kolonocus) itatsi T.
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