Russian and American scientists have studied walruses in the Chukchi sea

© RIA Novosti / Ilya Petliurite in fotobanka walruses in Chukotka. Archival photoRussian and American scientists have studied walruses in the Chukchi sea© RIA Novosti / Ilya Petliurite the image Bank

Scientists in the US and Russia during a joint expedition in the Chukchi sea has collected comprehensive data for the study of population and migration activity of Pacific walrus, according to the national Park «Beringia».

The work was conducted by the Kamchatka branch of Pacific Institute of geography Feb RAS jointly with American colleagues from the Federal Department of fish and wildlife Fish&Wildlife Service on the Russian research vessel ice-class «Professor Multanovsky» in the Chukchi sea.

«The work was carried out with the aim of obtaining current data on the number of animals, sex and age structure, migration activity of animals. In the present work to estimate population size method is used to re-capture, in which labels are used as genetic markers. Estimating the frequency of re-encounters of walruses by districts, by gender and age groups, with the help of mathematical models is the estimate of total population size, proportion of different sex and age groups,» — said in the message.

The project continues for several years, this year the scientists collected data across the ice edge in the Chukchi sea in the Russian and American zones, thus obtaining a complete picture.

According to experts, assessment of the status of the Pacific walrus population is particularly important because in recent years the summer-autumn period before, and a rapidly shrinking ice cover in the Chukchi sea, therefore increases liebesny the period when the walruses come ashore. One of the large coastal haul-outs located on the territory of national Park «Beringia» on the island of Kolyuchin.