Southern elephant seals from Kerguelen Islands confronted by Antarctic Sea ice. Changes in movements and in diving behaviour
Identifieur interne : 009346 ( Main/Exploration ); précédent : 009345; suivant : 009347Southern elephant seals from Kerguelen Islands confronted by Antarctic Sea ice. Changes in movements and in diving behaviour
Auteurs : Frédéric Bailleul [France] ; Jean-Benoit Charrassin [France] ; Robert Ezraty [France] ; Fanny Girard-Ardhuin [France] ; Clive R. Mcmahon [Australie] ; Iain C. Field [Australie] ; Christophe Guinet [France]Source :
- Deep-sea research. Part 2. Topical studies in oceanography [ 0967-0645 ] ; 2007.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Océan Antarctique, Satellite.
English descriptors
- KwdEn :
Abstract
The behaviour of southern elephant seals from Kerguelen Island (49°50'S, 70°30'E) was investigated in relation to the oceanographic regions of the Southern Ocean. The oceanographic and the seal behaviour data, including location and diving activity, were collected using a new generation of satellite-relayed devices measuring and transmitting pressure, temperature, and salinity along with locations. Dive duration, maximum diving depth, time spent at the bottom of the dives, and shape of dive profiles were compared between male and female seals, and were related to the oceanographic characteristics of areas prospected by the seals. Most animals travelled to the Antarctic shelf. However, during winter, adult females travelled away from the continent, remained and foraged within the marginal sea-ice zone, while juvenile males remained within the pack ice to forage mainly on the Antarctic shelf. Therefore, as the ice expanded females appeared to shift from benthic to pelagic foraging farther north, while males continued to forage almost exclusively benthically on the continental shelf. This difference is likely related to the different energetic requirements between the two sexes, but also may be related to pregnant females having to return to Kerguelen in early spring in order to give birth and successfully raise their pups, while males can remain in the ice. Our results show an important link between elephant seals and Antarctic sea ice and suggest that changes in sea-ice conditions could strongly affect the behaviour of this species.
Affiliations:
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Mcmahon</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Antarctic Wildlife Research Unit, School of Zoology, University of Tasmania, P.O. Box 252-0</s1><s2>Hobart, Tasmania 7001</s2><s3>AUS</s3><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Hobart, Tasmania 7001</wicri:noRegion></affiliation></author><author><name sortKey="Field, Iain C" sort="Field, Iain C" uniqKey="Field I" first="Iain C." last="Field">Iain C. Field</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Antarctic Wildlife Research Unit, School of Zoology, University of Tasmania, P.O. Box 252-0</s1><s2>Hobart, Tasmania 7001</s2><s3>AUS</s3><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Hobart, Tasmania 7001</wicri:noRegion></affiliation></author><author><name sortKey="Guinet, Christophe" sort="Guinet, Christophe" uniqKey="Guinet C" first="Christophe" last="Guinet">Christophe Guinet</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Centre d'Etudes Biologiques de Chizé, Centre National de la Recherche Scientifique</s1><s2>79360 Villiers en Bois</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>79360 Villiers en Bois</wicri:noRegion><wicri:noRegion>Centre National de la Recherche Scientifique</wicri:noRegion><wicri:noRegion>79360 Villiers en Bois</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Deep-sea research. Part 2. Topical studies in oceanography</title><title level="j" type="abbreviated">Deep-sea res., Part 2, Top. stud. oceanogr.</title><idno type="ISSN">0967-0645</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Deep-sea research. Part 2. Topical studies in oceanography</title><title level="j" type="abbreviated">Deep-sea res., Part 2, Top. stud. oceanogr.</title><idno type="ISSN">0967-0645</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Antarctic Ocean</term><term>Antarctic Seas</term><term>Antarctica</term><term>Energetics</term><term>Kerguelen Islands</term><term>Pack ice</term><term>Spring(season)</term><term>Winter</term><term>continental shelf</term><term>continents</term><term>depth</term><term>marginal seas</term><term>pressure</term><term>salinity</term><term>satellites</term><term>sea ice</term><term>springs</term><term>temperature</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Mers Antarctiques</term><term>Glace marine</term><term>Océan Antarctique</term><term>Satellite</term><term>Pression</term><term>Température</term><term>Salinité</term><term>Profondeur</term><term>Hiver</term><term>Continent</term><term>Mer marginale</term><term>Banquise</term><term>Plateforme continentale</term><term>Energétique</term><term>Source</term><term>Printemps</term><term>Iles Kerguelen</term><term>Kerguelen</term><term>Antarctique</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Océan Antarctique</term><term>Satellite</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The behaviour of southern elephant seals from Kerguelen Island (49°50'S, 70°30'E) was investigated in relation to the oceanographic regions of the Southern Ocean. The oceanographic and the seal behaviour data, including location and diving activity, were collected using a new generation of satellite-relayed devices measuring and transmitting pressure, temperature, and salinity along with locations. Dive duration, maximum diving depth, time spent at the bottom of the dives, and shape of dive profiles were compared between male and female seals, and were related to the oceanographic characteristics of areas prospected by the seals. Most animals travelled to the Antarctic shelf. However, during winter, adult females travelled away from the continent, remained and foraged within the marginal sea-ice zone, while juvenile males remained within the pack ice to forage mainly on the Antarctic shelf. Therefore, as the ice expanded females appeared to shift from benthic to pelagic foraging farther north, while males continued to forage almost exclusively benthically on the continental shelf. This difference is likely related to the different energetic requirements between the two sexes, but also may be related to pregnant females having to return to Kerguelen in early spring in order to give birth and successfully raise their pups, while males can remain in the ice. Our results show an important link between elephant seals and Antarctic sea ice and suggest that changes in sea-ice conditions could strongly affect the behaviour of this species.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Nouvelle-Aquitaine</li><li>Poitou-Charentes</li><li>Île-de-France</li></region><settlement><li>Paris</li><li>Villiers en Bois</li></settlement></list><tree><country name="France"><region name="Nouvelle-Aquitaine"><name sortKey="Bailleul, Frederic" sort="Bailleul, Frederic" uniqKey="Bailleul F" first="Frédéric" last="Bailleul">Frédéric Bailleul</name></region><name sortKey="Charrassin, Jean Benoit" sort="Charrassin, Jean Benoit" uniqKey="Charrassin J" first="Jean-Benoit" last="Charrassin">Jean-Benoit Charrassin</name><name sortKey="Ezraty, Robert" sort="Ezraty, Robert" uniqKey="Ezraty R" first="Robert" last="Ezraty">Robert Ezraty</name><name sortKey="Girard Ardhuin, Fanny" sort="Girard Ardhuin, Fanny" uniqKey="Girard Ardhuin F" first="Fanny" last="Girard-Ardhuin">Fanny Girard-Ardhuin</name><name sortKey="Girard Ardhuin, Fanny" sort="Girard Ardhuin, Fanny" uniqKey="Girard Ardhuin F" first="Fanny" last="Girard-Ardhuin">Fanny Girard-Ardhuin</name><name sortKey="Guinet, Christophe" sort="Guinet, Christophe" uniqKey="Guinet C" first="Christophe" last="Guinet">Christophe Guinet</name></country><country name="Australie"><noRegion><name sortKey="Mcmahon, Clive R" sort="Mcmahon, Clive R" uniqKey="Mcmahon C" first="Clive R." last="Mcmahon">Clive R. Mcmahon</name></noRegion><name sortKey="Field, Iain C" sort="Field, Iain C" uniqKey="Field I" first="Iain C." last="Field">Iain C. Field</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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