Adult Steller sea lion mortality on rookeries in the Russian Far East, 2002–2010

Adult Steller sea lion mortality on rookeries in the Russian Far East, 2002–2010 We used visual observations during nine field seasons to determine the causes and death rate of Steller sea lions older than 1 year on eight rookeries in the Russian Far East. The average annual death rate was 0.48% of the total recorded Steller sea lions on shore and varied among rookeriesy. The mortality did not exceed 0.29% in six rookeries, but reached 0.80–1.19% in two rookeries. Individuals of all age and sex groups were recorded among dead animals. Bulls died as a result of territorial conflicts, and cows and young lions were crushed or suffocated by bulls during copulation. The death of nearly half of the females was attributed to 11 bulls. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Adult Steller sea lion mortality on rookeries in the Russian Far East, 2002–2010

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2012 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S106307401206003X
Publisher site
See Article on Publisher Site

Abstract

We used visual observations during nine field seasons to determine the causes and death rate of Steller sea lions older than 1 year on eight rookeries in the Russian Far East. The average annual death rate was 0.48% of the total recorded Steller sea lions on shore and varied among rookeriesy. The mortality did not exceed 0.29% in six rookeries, but reached 0.80–1.19% in two rookeries. Individuals of all age and sex groups were recorded among dead animals. Bulls died as a result of territorial conflicts, and cows and young lions were crushed or suffocated by bulls during copulation. The death of nearly half of the females was attributed to 11 bulls.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Jan 4, 2013

References

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