Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 309:1-10 (2006) - doi:10.3354/meps309001 Impact of El Niño on the foraging behavior of female northern elephant seals Daniel E. Crocker1,*, Daniel P. Costa2, Burney J. Le Boeuf2, Paul M. Webb3, Dorian S. Houser1 1Department of Biology, Sonoma State University, 1801 East Cotati Road, Rohnert Park, California 94928, USA 2Department of Biology, Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA 3Department of Biology, Roger Williams University, One Old Ferry Road, Bristol, Rhode Island 02809, USA *Email: crocker@sonoma.edu ABSTRACT: Our aim was to examine the foraging behavior of northern elephant seals Mirounga angustirostris during the 199798 El Niño and compare it to foraging in others years. Given their deep diving and spatial distribution, their immediate response to a severe El Niño was expected to give insight into the timing, scale and magnitude of El Niño Southern Oscillation impacts on a large marine predator. Time-depth records and Argos-linked satellite tracks were obtained from adult females departing on post-breeding foraging migrations from 1990 to 1999, including females foraging during the 1998 El Niño. Rates of mass gain and trip duration were recorded for females from 1983 to 1999. Movement tracks of females in 1998 were similar to those observed in non-El Niño years. Rate of mass gain at sea was 0.29 ± 0.36 kg d1 in 1998, the lowest measured since 1983. Marked declines in the mass gain rate of females were noted in severe El Niño years, but not in moderate El Niño years. Females increase spring foraging trip duration to compensate for decreases in foraging success. In 1998, the frequency distribution and temporal pattern of dive shapes suggested reduced residence time in prey patches and increased travel time between patches and these parameters showed a strong relationship with rates of mass gain. Our data confirm that the immediate ecological impact of the 199798 El Niño was not limited to the near-shore coastal margin, but extended far out into the North Pacific Ocean. KEY WORDS: El Niño · Foraging · Seals · Water temperature · Prey patches Full text in pdf format NextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 309. Online publication date: March 15, 2006 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2006 Inter-Research.
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