New data on the number of northern fur seal ( Callorhinus ursinus), Steller sea lion ( Eumetopias jubatus), and spotted seal ( Phoca largha) at Tyuleny Island (Okhotsk Sea)
https://doi.org/10.26428/1606-9919-2014-178-87-94
Abstract
The latest data on abundance and distribution of northern fur seal ( Callorhinus ursinus ), Steller sea lion ( Eumetopias jubatus ), and spotted seal ( Phoca largha ) at Tyuleny Island (Okhotsk Sea) are presented. The total counted number of fur seals was 115 thousand in June-July of 2013, including 5.0 thousand of bulls, 30.3 thousand of females, and 34.7 thousand of pups (31.5 thousand alive and 3.2 thousand dead). Decreasing of the females and pups number is observed during the last 4 years - they became lesser in 18.0 % or 4.5 % per year. The counted number of Steller sea lions was 1879 adults (including 119 bulls, and 1390 females, 68.5 % of them gave birth) and 890 pups. The reproductive group of Steller sea lion increases its abundance on the island due to numerous immigrants. Abundance of spotted seal was very various seasonally and even daily, its highest counted number was 162 individuals.
About the Author
Alexey E. Kuzin
Тихоокеанский научно-исследовательский рыбохозяйственный центр
Russian Federation
Russian Federation
References
1. Болтнев А.И. Причины смертности новорожденных котиков // Изв. ТИНРО. - 1990. - Т. 112. - С. 35-38.
2. Кузин А.Е. Ларга острова Тюленьего (Охотское море) // Изв. ТИНРО. - 2002. - Т. 130. - С. 1240-1245.
3. Кузин А.Е. Роль плодовитости и смертности в регуляции численности популяций северного морского котика // Изв. ТИНРО. - 1999а. - Т. 126. - С. 483-502.
4. Кузин А.Е. Северный морской котик : монография. - М. : Совет по морским млекопитающим, 1999б. - 395 с.
5. Кузин А.Е., Курмазов А.А. Видовой состав, межгодовая и сезонная динамика численности ластоногих о. Тюленьего // Морские млекопитающие Голарктики : мат-лы Междунар. конф. - Архангельск, 2000. - С. 208-212.
6. Calambokidis J., Gentry R.L. Mortality of Northern fur seal pups in relation to growth and birth weights // J. Wildl. - 1985. - Vol. 21(3). - Р. 327-330.
7. Lander R.H. Method of determining natural mortality in the Northern fur seal (Callorhinus ursinus) from known pups and kill by age and sex // J. Fish. Res. Bd Canada. - 1975. - Vol. 32(12). - Р. 2447-2452.
8. Ricker W.E. Stock and recruitment // J. Fish. Res. Bd Canada. - 1954. - Vol. 11(5). - Р. 559-623.
9. Trites A.W. Fetal growth of Northern fur seals: life-history strategy and source of variation // Can. J. Zool. - 1991. - Vol. 69. - Р. 2608-2617.
Review
For citations:
Kuzin A.E. New data on the number of northern fur seal ( Callorhinus ursinus), Steller sea lion ( Eumetopias jubatus), and spotted seal ( Phoca largha) at Tyuleny Island (Okhotsk Sea). Izvestiya TINRO. 2014;178(3):87-94. (In Russ.) https://doi.org/10.26428/1606-9919-2014-178-87-94
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