Foraging ecology of subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island: seasonal changes in relation to maternal characteristics and pup growth
15 pages International audience The distribution and availability of marine resources are directly affected by seasonal spatial changes in physical and oceanographic features. They are thus likely to influence maternal foraging provisioning patterns, efficiency, and subsequent pup growth rate of cen...
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Online Access: | https://hal.science/hal-00186728 https://doi.org/10.3354/meps273211 |
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ftunivrochelle:oai:HAL:hal-00186728v1 2024-02-11T09:55:13+01:00 Foraging ecology of subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island: seasonal changes in relation to maternal characteristics and pup growth Beauplet, Gwénaël Dubroca, Laurent Guinet, Christophe Cherel, Yves Dabin, Willy Gagne, Céline Hindell, Mark Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Centre de Recherche sur les Mammifères Marins (CRMM) La Rochelle Université (ULR) Antartic Wildlife Research Unit School of Zoology, University of Tasmania 2004-06 https://hal.science/hal-00186728 https://doi.org/10.3354/meps273211 en eng HAL CCSD Inter Research info:eu-repo/semantics/altIdentifier/doi/10.3354/meps273211 hal-00186728 https://hal.science/hal-00186728 doi:10.3354/meps273211 ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-00186728 Marine Ecology Progress Series, 2004, 273, pp.211-225. ⟨10.3354/meps273211⟩ Foraging ecology Activity budget Seasonal changes Maternal performances Pup growth Fur seal Arctocephalus tropicalis Amsterdam Island [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 2004 ftunivrochelle https://doi.org/10.3354/meps273211 2024-01-23T23:35:21Z 15 pages International audience The distribution and availability of marine resources are directly affected by seasonal spatial changes in physical and oceanographic features. They are thus likely to influence maternal foraging provisioning patterns, efficiency, and subsequent pup growth rate of central place foragers such as otariid seals. While previous studies have documented foraging locations and diving activity of female otariids in relation to oceanographic features, few have focused on species characterised by a long pup-rearing period. The present study investigated seasonal changes in foraging parameters in relation to the following oceanographic features and maternal characteristics: foraging grounds (using satellite tags, geolocation, GIS and kernel estimation techniques), at-sea activity budget (using time–depth recorders), and the foraging success and diet of female subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island (southern Indian Ocean). The seals mainly exploited the subtropical front, but also exhibited large differences in seasonal distribution, from short trips in restricted foraging areas during summer to widely distributed foraging grounds during the winter. This is consistent with a seasonal shift in diet and an increasing proportion of time being dedicated to diving and resting. This increase in foraging trip duration throughout the season paralleled decreasing rates in maternal mass gain and pup growth, suggesting a decrease in food availability. During the summer, maternal mass gain rate and pup growth were related to foraging tactics (percent of time spent diving and in the core foraging area), whereas maternal characteristics such as body length were more important during the latter months of the pup-rearing period. However, no influence of age and thus no apparent advantage of female experience was detected in this study. Article in Journal/Newspaper Amsterdam Island HAL - Université de La Rochelle Indian Marine Ecology Progress Series 273 211 225 |
institution |
Open Polar |
collection |
HAL - Université de La Rochelle |
op_collection_id |
ftunivrochelle |
language |
English |
topic |
Foraging ecology Activity budget Seasonal changes Maternal performances Pup growth Fur seal Arctocephalus tropicalis Amsterdam Island [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Foraging ecology Activity budget Seasonal changes Maternal performances Pup growth Fur seal Arctocephalus tropicalis Amsterdam Island [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes Beauplet, Gwénaël Dubroca, Laurent Guinet, Christophe Cherel, Yves Dabin, Willy Gagne, Céline Hindell, Mark Foraging ecology of subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island: seasonal changes in relation to maternal characteristics and pup growth |
topic_facet |
Foraging ecology Activity budget Seasonal changes Maternal performances Pup growth Fur seal Arctocephalus tropicalis Amsterdam Island [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDE.MCG]Environmental Sciences/Global Changes |
description |
15 pages International audience The distribution and availability of marine resources are directly affected by seasonal spatial changes in physical and oceanographic features. They are thus likely to influence maternal foraging provisioning patterns, efficiency, and subsequent pup growth rate of central place foragers such as otariid seals. While previous studies have documented foraging locations and diving activity of female otariids in relation to oceanographic features, few have focused on species characterised by a long pup-rearing period. The present study investigated seasonal changes in foraging parameters in relation to the following oceanographic features and maternal characteristics: foraging grounds (using satellite tags, geolocation, GIS and kernel estimation techniques), at-sea activity budget (using time–depth recorders), and the foraging success and diet of female subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island (southern Indian Ocean). The seals mainly exploited the subtropical front, but also exhibited large differences in seasonal distribution, from short trips in restricted foraging areas during summer to widely distributed foraging grounds during the winter. This is consistent with a seasonal shift in diet and an increasing proportion of time being dedicated to diving and resting. This increase in foraging trip duration throughout the season paralleled decreasing rates in maternal mass gain and pup growth, suggesting a decrease in food availability. During the summer, maternal mass gain rate and pup growth were related to foraging tactics (percent of time spent diving and in the core foraging area), whereas maternal characteristics such as body length were more important during the latter months of the pup-rearing period. However, no influence of age and thus no apparent advantage of female experience was detected in this study. |
author2 |
Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Centre de Recherche sur les Mammifères Marins (CRMM) La Rochelle Université (ULR) Antartic Wildlife Research Unit School of Zoology, University of Tasmania |
format |
Article in Journal/Newspaper |
author |
Beauplet, Gwénaël Dubroca, Laurent Guinet, Christophe Cherel, Yves Dabin, Willy Gagne, Céline Hindell, Mark |
author_facet |
Beauplet, Gwénaël Dubroca, Laurent Guinet, Christophe Cherel, Yves Dabin, Willy Gagne, Céline Hindell, Mark |
author_sort |
Beauplet, Gwénaël |
title |
Foraging ecology of subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island: seasonal changes in relation to maternal characteristics and pup growth |
title_short |
Foraging ecology of subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island: seasonal changes in relation to maternal characteristics and pup growth |
title_full |
Foraging ecology of subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island: seasonal changes in relation to maternal characteristics and pup growth |
title_fullStr |
Foraging ecology of subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island: seasonal changes in relation to maternal characteristics and pup growth |
title_full_unstemmed |
Foraging ecology of subantarctic fur seals Arctocephalus tropicalis breeding on Amsterdam Island: seasonal changes in relation to maternal characteristics and pup growth |
title_sort |
foraging ecology of subantarctic fur seals arctocephalus tropicalis breeding on amsterdam island: seasonal changes in relation to maternal characteristics and pup growth |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00186728 https://doi.org/10.3354/meps273211 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Amsterdam Island |
genre_facet |
Amsterdam Island |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-00186728 Marine Ecology Progress Series, 2004, 273, pp.211-225. ⟨10.3354/meps273211⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps273211 hal-00186728 https://hal.science/hal-00186728 doi:10.3354/meps273211 |
op_doi |
https://doi.org/10.3354/meps273211 |
container_title |
Marine Ecology Progress Series |
container_volume |
273 |
container_start_page |
211 |
op_container_end_page |
225 |
_version_ |
1790594495497109504 |