Impact of El Ni??o on the Foraging Behavior of Female Northern Elephant Seals
Published by and copyright by Inter Research. Our aim was to examine the foraging behavior of northern elephant seals Mirounga angustirostris during the 1997???98 El Ni??o and compare it to foraging in others years. Given their deep diving and spatial distribution, their immediate response to a seve...
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ftcalifstateuniv:oai:dspace.calstate.edu:10211.1/1430 2023-05-15T16:05:23+02:00 Impact of El Ni??o on the Foraging Behavior of Female Northern Elephant Seals Crocker, Daniel E. Costa, Daniel P. Le Boeuf, Burney J. Webb, Paul M. Houser, Dorian S. Crocker, Daniel E. 2006 http://hdl.handle.net/10211.1/1430 en_US eng Marine Ecology Progress Series Marine Ecology Progress Series Crocker, D.E., D.P. Costa, B.J. Le Boeuf, P.M. Webb and D.S. Houser. 2006. Impact of El Nino on the foraging behavior of female northern elephant seals. Marine Ecology Progress Series. 309:1-10. 0171-8630 http://hdl.handle.net/10211.1/1430 El Nino seals water temperature prey patches environmental physiology northern elephant seal Article 2006 ftcalifstateuniv 2022-04-13T11:01:52Z Published by and copyright by Inter Research. Our aim was to examine the foraging behavior of northern elephant seals Mirounga angustirostris during the 1997???98 El Ni??o and compare it to foraging in others years. Given their deep diving and spatial distribution, their immediate response to a severe El Ni??o was expected to give insight into the timing, scale and magnitude of El Ni??o Southern Oscillation impacts on a large marine predator. Time-depth records and Argoslinked satellite tracks were obtained from adult females departing on post-breeding foraging migrations from 1990 to 1999, including females foraging during the 1998 El Ni??o. 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 Ni??o years. Rate of mass gain at sea was 0.29 ?? 0.36 kg d???1 in 1998, the lowest measured since 1983. Marked declines in the mass gain rate of females were noted in severe El Ni??o years, but not in moderate El Ni??o 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 1997???98 El Ni??o was not limited to the near-shore coastal margin, but Article in Journal/Newspaper Elephant Seal Elephant Seals California State University (CSU): DSpace |
institution |
Open Polar |
collection |
California State University (CSU): DSpace |
op_collection_id |
ftcalifstateuniv |
language |
English |
topic |
El Nino seals water temperature prey patches environmental physiology northern elephant seal |
spellingShingle |
El Nino seals water temperature prey patches environmental physiology northern elephant seal Crocker, Daniel E. Costa, Daniel P. Le Boeuf, Burney J. Webb, Paul M. Houser, Dorian S. Impact of El Ni??o on the Foraging Behavior of Female Northern Elephant Seals |
topic_facet |
El Nino seals water temperature prey patches environmental physiology northern elephant seal |
description |
Published by and copyright by Inter Research. Our aim was to examine the foraging behavior of northern elephant seals Mirounga angustirostris during the 1997???98 El Ni??o and compare it to foraging in others years. Given their deep diving and spatial distribution, their immediate response to a severe El Ni??o was expected to give insight into the timing, scale and magnitude of El Ni??o Southern Oscillation impacts on a large marine predator. Time-depth records and Argoslinked satellite tracks were obtained from adult females departing on post-breeding foraging migrations from 1990 to 1999, including females foraging during the 1998 El Ni??o. 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 Ni??o years. Rate of mass gain at sea was 0.29 ?? 0.36 kg d???1 in 1998, the lowest measured since 1983. Marked declines in the mass gain rate of females were noted in severe El Ni??o years, but not in moderate El Ni??o 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 1997???98 El Ni??o was not limited to the near-shore coastal margin, but |
author2 |
Crocker, Daniel E. |
format |
Article in Journal/Newspaper |
author |
Crocker, Daniel E. Costa, Daniel P. Le Boeuf, Burney J. Webb, Paul M. Houser, Dorian S. |
author_facet |
Crocker, Daniel E. Costa, Daniel P. Le Boeuf, Burney J. Webb, Paul M. Houser, Dorian S. |
author_sort |
Crocker, Daniel E. |
title |
Impact of El Ni??o on the Foraging Behavior of Female Northern Elephant Seals |
title_short |
Impact of El Ni??o on the Foraging Behavior of Female Northern Elephant Seals |
title_full |
Impact of El Ni??o on the Foraging Behavior of Female Northern Elephant Seals |
title_fullStr |
Impact of El Ni??o on the Foraging Behavior of Female Northern Elephant Seals |
title_full_unstemmed |
Impact of El Ni??o on the Foraging Behavior of Female Northern Elephant Seals |
title_sort |
impact of el ni??o on the foraging behavior of female northern elephant seals |
publisher |
Marine Ecology Progress Series |
publishDate |
2006 |
url |
http://hdl.handle.net/10211.1/1430 |
genre |
Elephant Seal Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals |
op_relation |
Marine Ecology Progress Series Crocker, D.E., D.P. Costa, B.J. Le Boeuf, P.M. Webb and D.S. Houser. 2006. Impact of El Nino on the foraging behavior of female northern elephant seals. Marine Ecology Progress Series. 309:1-10. 0171-8630 http://hdl.handle.net/10211.1/1430 |
_version_ |
1766401278230921216 |