Chapter

Potential Influences of Whaling on the Status and Trends of Pinniped Populations

DANIEL P. COSTA, MICHAEL J. WEISE and JOHN P.Y. ARNOULD

in Whales, Whaling, and Ocean Ecosystems

Published by University of California Press

Published in print January 2007 | ISBN: 9780520248847
Published online March 2012 | e-ISBN: 9780520933200 | DOI: http://dx.doi.org/10.1525/california/9780520248847.003.0027
Potential Influences of Whaling on the Status and Trends of Pinniped Populations

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This chapter reviews the current trends of pinniped populations worldwide and summarizes the known or suspected reasons for recent declines. It evaluates trends in pinniped populations attributed to natural biological processes in terms of reproductive strategies, physiological limitations, and the resultant susceptibility to disturbance in prey resources and predation brought about by these factors. Increasing populations include most of the southern hemisphere fur seals, the California sea lion, harbor seal populations off the west coast of the United States, and the northern elephant seal. Populations in decline include northern and southern sea lions, the northern fur seal, the southern elephant seal in parts of the Southern Ocean, and the harbor seal in southwest Alaska. The tropical monk seals are either stable at low levels or in decline. Population trends for polar species are poorly known, although by and large these species appear to be both abundant and fairly stable.

Keywords: pinniped populations; reproductive strategies; prey resources; predation; California sea lion; fur seals

Chapter.  10882 words.  Illustrated.

Subjects: Aquatic Biology

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