Differences in foraging strategy and maternal behaviour between two sympatric fur seal species at the Crozet Islands
Identifieur interne : 00A682 ( Main/Exploration ); précédent : 00A681; suivant : 00A683Differences in foraging strategy and maternal behaviour between two sympatric fur seal species at the Crozet Islands
Auteurs : Frédéric Bailleul [France] ; Sebastian Luque [France, Canada] ; Laurent Dubroca [France] ; John P. Y. Arnould [Australie] ; Christophe Guinet [France]Source :
- Marine ecology. Progress series : (Halstenbek) [ 0171-8630 ] ; 2005.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Milieu marin, Répartition géographique.
English descriptors
- KwdEn :
Abstract
Marine top-predators such as marine mammals forage in a heterogeneous environment according to their energetic requirements and to the variation in environmental characteristics. In this study, the behaviour of breeding females in 2 sympatric fur seal species, Antarctic fur seal Arctocephalus gazella and Subantarctic fur seal A. tropicalis, was investigated in relation to foraging effort. Foraging effort was hypothesised to be greater in Antarctic fur seal than in Subantarctic fur seal due to their shorter lactation period. Using satellite telemetry, time-depth recorders and satellite images of sea-surface temperature and chlorophyll a concentration, the foraging grounds, the at-sea activity budgets and the environmental features were determined for both species breeding on the Crozet Archipelago. Foraging cycle duration was similar for the 2 species, and the seals exhibited similar at-sea activity budgets. Only the proportion of time spent at sea was higher in Antarctic fur seals. Separate foraging areas were identified for the 2 species. Antarctic fur seal distribution was related to bathymetric features, while we did not find any direct relationship between chlorophyll a concentration and seal foraging areas. Our results suggest that Antarctic fur seals tend to respond to the higher needs of their pups by having a higher foraging efficiency and concentrating their foraging activity in the most productive areas.
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Y." last="Arnould">John P. Y. Arnould</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>School of Biological and Chemical Sciences, Deakin University</s1><s2>Burwood 3125, Victoria</s2><s3>AUS</s3><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Burwood 3125, Victoria</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 Villlers en Bois</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>79360 Villlers en Bois</wicri:noRegion><wicri:noRegion>Centre National de la Recherche Scientifique</wicri:noRegion><wicri:noRegion>79360 Villlers en Bois</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Marine ecology. Progress series : (Halstenbek)</title><title level="j" type="abbreviated">Mar. ecol., Prog. ser. : (Halstenbek)</title><idno type="ISSN">0171-8630</idno><imprint><date when="2005">2005</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Marine ecology. Progress series : (Halstenbek)</title><title level="j" type="abbreviated">Mar. ecol., Prog. ser. : (Halstenbek)</title><idno type="ISSN">0171-8630</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Activity</term><term>Arctocephalus gazella</term><term>Crozet Islands</term><term>Foraging behavior</term><term>Fur</term><term>Geographic distribution</term><term>Marine environment</term><term>Spatial distribution</term><term>Strategy</term><term>Sympatry</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Fourragement</term><term>Stratégie</term><term>Sympatrie</term><term>Fourrure</term><term>Iles Crozet</term><term>Activité</term><term>Répartition spatiale</term><term>Milieu marin</term><term>Répartition géographique</term><term>Arctocephalus gazella</term><term>Arctocephalus tropicalis</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Milieu marin</term><term>Répartition géographique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Marine top-predators such as marine mammals forage in a heterogeneous environment according to their energetic requirements and to the variation in environmental characteristics. In this study, the behaviour of breeding females in 2 sympatric fur seal species, Antarctic fur seal Arctocephalus gazella and Subantarctic fur seal A. tropicalis, was investigated in relation to foraging effort. Foraging effort was hypothesised to be greater in Antarctic fur seal than in Subantarctic fur seal due to their shorter lactation period. Using satellite telemetry, time-depth recorders and satellite images of sea-surface temperature and chlorophyll a concentration, the foraging grounds, the at-sea activity budgets and the environmental features were determined for both species breeding on the Crozet Archipelago. Foraging cycle duration was similar for the 2 species, and the seals exhibited similar at-sea activity budgets. Only the proportion of time spent at sea was higher in Antarctic fur seals. Separate foraging areas were identified for the 2 species. Antarctic fur seal distribution was related to bathymetric features, while we did not find any direct relationship between chlorophyll a concentration and seal foraging areas. Our results suggest that Antarctic fur seals tend to respond to the higher needs of their pups by having a higher foraging efficiency and concentrating their foraging activity in the most productive areas.</div></front></TEI><affiliations><list><country><li>Australie</li><li>Canada</li><li>France</li></country><region><li>Nouvelle-Aquitaine</li><li>Poitou-Charentes</li></region><settlement><li>Villlers 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="Dubroca, Laurent" sort="Dubroca, Laurent" uniqKey="Dubroca L" first="Laurent" last="Dubroca">Laurent Dubroca</name><name sortKey="Guinet, Christophe" sort="Guinet, Christophe" uniqKey="Guinet C" first="Christophe" last="Guinet">Christophe Guinet</name><name sortKey="Luque, Sebastian" sort="Luque, Sebastian" uniqKey="Luque S" first="Sebastian" last="Luque">Sebastian Luque</name></country><country name="Canada"><noRegion><name sortKey="Luque, Sebastian" sort="Luque, Sebastian" uniqKey="Luque S" first="Sebastian" last="Luque">Sebastian Luque</name></noRegion></country><country name="Australie"><noRegion><name sortKey="Arnould, John P Y" sort="Arnould, John P Y" uniqKey="Arnould J" first="John P. Y." last="Arnould">John P. Y. Arnould</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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