Extreme weather events influence dispersal of naive northern fur seals.

Biology Letters
M A LeaT Gelatt

Abstract

Since 1975, northern fur seal (Callorhinus ursinus) numbers at the Pribilof Islands (PI) in the Bering Sea have declined rapidly for unknown reasons. Migratory dispersal and habitat choice may affect first-year survivorship, thereby contributing to this decline. We compared migratory behaviour of 166 naive pups during 2 years from islands with disparate population trends (increasing: Bogoslof and San Miguel Islands; declining: PI), hypothesizing that climatic conditions at weaning may differentially affect dispersal and survival. Atmospheric conditions (Bering Sea) in autumn 2005-2006 were anomalously cold, while 2006-2007 was considerably warmer and less stormy. In 2005, pups departed earlier at all sites, and the majority of PI pups (68-85%) departed within 1 day of Arctic storms and dispersed quickly, travelling southwards through the Aleutian Islands. Tailwinds enabled faster rates of travel than headwinds, a trend not previously shown for marine mammals. Weather effects were less pronounced at Bogoslof Island (approx. 400 km further south), and, at San Miguel Island, (California) departures were more gradual, and only influenced by wind and air pressure in 2005. We suggest that increasingly variable climatic conditions at ...Continue Reading

References

Sep 28, 2004·Physiological and Biochemical Zoology : PBZ·Matthew R RutishauserTerrie M Williams

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Citations

Oct 18, 2011·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Michelle R SheroJennifer M Burns
Feb 10, 2012·Journal of the Royal Society, Interface·C Monzón-ArgüelloPatricia L M Lee
Dec 17, 2015·Scientific Reports·Alice Della PennaFrancesco d'Ovidio
Aug 3, 2010·The Journal of Animal Ecology·P W RobinsonD P Costa

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