Colony-based foraging segregation by Antarctic fur seals at the Kerguelen Archipelago
International audience The foraging behaviour of conspecific female Antarctic fur seals (AFS) was compared simultaneously at 2 breeding colonies at Îles Kerguelen (S Indian Ocean). A remnant colony at ÎIes Nuageuses (IN) thought to have escaped sealing is hypothesized to be the source of increasing...
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Online Access: | https://hal.science/hal-00286317 https://doi.org/10.3354/meps07305 |
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ftccsdartic:oai:HAL:hal-00286317v1 2024-02-27T08:35:18+00:00 Colony-based foraging segregation by Antarctic fur seals at the Kerguelen Archipelago Lea, Marie-Anne Guinet, Christophe Cherel, Yves Hindell, Mark Dubroca, Laurent Thalmann, Sam Antartic Wildlife Research Unit School of Zoology, University of Tasmania Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Antarctic Wildlife Research Unit University of Tasmania Hobart, Australia (UTAS) 2008-06-09 https://hal.science/hal-00286317 https://doi.org/10.3354/meps07305 en eng HAL CCSD Inter Research info:eu-repo/semantics/altIdentifier/doi/10.3354/meps07305 hal-00286317 https://hal.science/hal-00286317 doi:10.3354/meps07305 ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-00286317 Marine Ecology Progress Series, 2008, 358, pp.273-287. ⟨10.3354/meps07305⟩ Fur seal · Segregation · Myctophid · Diving · Southern Ocean [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2008 ftccsdartic https://doi.org/10.3354/meps07305 2024-01-28T02:21:20Z International audience The foraging behaviour of conspecific female Antarctic fur seals (AFS) was compared simultaneously at 2 breeding colonies at Îles Kerguelen (S Indian Ocean). A remnant colony at ÎIes Nuageuses (IN) thought to have escaped sealing is hypothesized to be the source of increasing fur seal numbers at Cap Noir (CN) on the Kerguelen mainland. Inter-annual variability in foraging areas is known to occur in response to local oceanographic changes at CN. Given the distance between the 2 sites (~160 km), we hypothesize that seals from the 2 colonies may show spatial segregation in foraging due to variability in local prey resource availability, although the transfer of foraging knowledge between sites via emigration may override such behaviour. The foraging zones, diving activity, diet and foraging success of seals were compared between sites using satellite telemetry, dive recorders and faecal analysis. No evidence of spatial foraging overlap was observed, with seals from IN conducting longer foraging trips, typified by a longer initial transit phase, than CN seals, which spent less time diving at night and dived more deeply. Pups nevertheless received higher absolute and daily energy delivery rates at IN. Diet was superficially similar at ~98% myctophid consumption; however, IN seals favoured the high-energy Gymnoscopelus nicholsi, indicating that local heterogeneity in marine resources likely influences the foraging zone choice of AFS. Finally, distribution patterns of 54 female AFS tracked during summer months from 1998 to 2006 reveal the importance of both on-shelf (<500 m) and shelf-break regions as foraging habitat. The core foraging area for CN in all years (10 400 km2) was small (~10% of total foraging space); however, time spent in this region alone totaled 38%. The likelihood of spatial overlap in foraging range is higher on the east coast of Kerguelen. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Cap Noir ENVELOPE(70.452,70.452,-49.069,-49.069) Îles Kerguelen ENVELOPE(69.167,69.167,-49.250,-49.250) Indian Kerguelen Southern Ocean Marine Ecology Progress Series 358 273 287 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Fur seal · Segregation · Myctophid · Diving · Southern Ocean [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Fur seal · Segregation · Myctophid · Diving · Southern Ocean [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes Lea, Marie-Anne Guinet, Christophe Cherel, Yves Hindell, Mark Dubroca, Laurent Thalmann, Sam Colony-based foraging segregation by Antarctic fur seals at the Kerguelen Archipelago |
topic_facet |
Fur seal · Segregation · Myctophid · Diving · Southern Ocean [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The foraging behaviour of conspecific female Antarctic fur seals (AFS) was compared simultaneously at 2 breeding colonies at Îles Kerguelen (S Indian Ocean). A remnant colony at ÎIes Nuageuses (IN) thought to have escaped sealing is hypothesized to be the source of increasing fur seal numbers at Cap Noir (CN) on the Kerguelen mainland. Inter-annual variability in foraging areas is known to occur in response to local oceanographic changes at CN. Given the distance between the 2 sites (~160 km), we hypothesize that seals from the 2 colonies may show spatial segregation in foraging due to variability in local prey resource availability, although the transfer of foraging knowledge between sites via emigration may override such behaviour. The foraging zones, diving activity, diet and foraging success of seals were compared between sites using satellite telemetry, dive recorders and faecal analysis. No evidence of spatial foraging overlap was observed, with seals from IN conducting longer foraging trips, typified by a longer initial transit phase, than CN seals, which spent less time diving at night and dived more deeply. Pups nevertheless received higher absolute and daily energy delivery rates at IN. Diet was superficially similar at ~98% myctophid consumption; however, IN seals favoured the high-energy Gymnoscopelus nicholsi, indicating that local heterogeneity in marine resources likely influences the foraging zone choice of AFS. Finally, distribution patterns of 54 female AFS tracked during summer months from 1998 to 2006 reveal the importance of both on-shelf (<500 m) and shelf-break regions as foraging habitat. The core foraging area for CN in all years (10 400 km2) was small (~10% of total foraging space); however, time spent in this region alone totaled 38%. The likelihood of spatial overlap in foraging range is higher on the east coast of Kerguelen. |
author2 |
Antartic Wildlife Research Unit School of Zoology, University of Tasmania Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Antarctic Wildlife Research Unit University of Tasmania Hobart, Australia (UTAS) |
format |
Article in Journal/Newspaper |
author |
Lea, Marie-Anne Guinet, Christophe Cherel, Yves Hindell, Mark Dubroca, Laurent Thalmann, Sam |
author_facet |
Lea, Marie-Anne Guinet, Christophe Cherel, Yves Hindell, Mark Dubroca, Laurent Thalmann, Sam |
author_sort |
Lea, Marie-Anne |
title |
Colony-based foraging segregation by Antarctic fur seals at the Kerguelen Archipelago |
title_short |
Colony-based foraging segregation by Antarctic fur seals at the Kerguelen Archipelago |
title_full |
Colony-based foraging segregation by Antarctic fur seals at the Kerguelen Archipelago |
title_fullStr |
Colony-based foraging segregation by Antarctic fur seals at the Kerguelen Archipelago |
title_full_unstemmed |
Colony-based foraging segregation by Antarctic fur seals at the Kerguelen Archipelago |
title_sort |
colony-based foraging segregation by antarctic fur seals at the kerguelen archipelago |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00286317 https://doi.org/10.3354/meps07305 |
long_lat |
ENVELOPE(70.452,70.452,-49.069,-49.069) ENVELOPE(69.167,69.167,-49.250,-49.250) |
geographic |
Antarctic Cap Noir Îles Kerguelen Indian Kerguelen Southern Ocean |
geographic_facet |
Antarctic Cap Noir Îles Kerguelen Indian Kerguelen Southern Ocean |
genre |
Antarc* Antarctic Antarctic Fur Seals Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Southern Ocean |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-00286317 Marine Ecology Progress Series, 2008, 358, pp.273-287. ⟨10.3354/meps07305⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps07305 hal-00286317 https://hal.science/hal-00286317 doi:10.3354/meps07305 |
op_doi |
https://doi.org/10.3354/meps07305 |
container_title |
Marine Ecology Progress Series |
container_volume |
358 |
container_start_page |
273 |
op_container_end_page |
287 |
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1792041782551248896 |