Bottom time does not always predict prey encounter rate in Antarctic fur seals
Ministère de la Recherche, Université Pierre et Marie Curie International audience 1. Optimal foraging models applied to breath-holding divers predict that diving predators should optimize the time spent foraging at the bottom of dives depending on prey encounter rate, distance to prey patch (depth)...
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Online Access: | https://hal.archives-ouvertes.fr/hal-01324015 https://doi.org/10.1111/1365-2435.12675 |
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ftccsdartic:oai:HAL:hal-01324015v1 2023-05-15T13:58:41+02:00 Bottom time does not always predict prey encounter rate in Antarctic fur seals Viviant, Morgane Jeanniard-du-Dot, Tiphaine Monestiez, Pascal, Authier, Matthieu Guinet, Christophe Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Fisheries Centre (Marine Mammal Research Unit) University of British Columbia (UBC) Biostatistique et Processus Spatiaux (BioSP) Institut National de la Recherche Agronomique (INRA) 2016 https://hal.archives-ouvertes.fr/hal-01324015 https://doi.org/10.1111/1365-2435.12675 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/1365-2435.12675 hal-01324015 https://hal.archives-ouvertes.fr/hal-01324015 doi:10.1111/1365-2435.12675 PRODINRA: 382078 WOS: 000387362600011 ISSN: 0269-8463 EISSN: 1365-2435 Functional Ecology https://hal.archives-ouvertes.fr/hal-01324015 Functional Ecology, Wiley, 2016, 30 (11), pp.1834-1844. ⟨10.1111/1365-2435.12675⟩ foraging strategies diving behaviour aerobic diving limit foraging depth Antarctic fur seals [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1111/1365-2435.12675 2021-11-21T02:48:14Z Ministère de la Recherche, Université Pierre et Marie Curie International audience 1. Optimal foraging models applied to breath-holding divers predict that diving predators should optimize the time spent foraging at the bottom of dives depending on prey encounter rate, distance to prey patch (depth) and physiological constraints.2. We tested this hypothesis on a free-ranging diving marine predator, the Antarctic fur seal Arctocephalus gazella, equipped with accelerometers or Hall sensors (n=11) that recorded mouth-opening events, a proxy for prey capture attempts and thus feeding events. Over the 5896 dives analyzed (>15m depth), the mean number of mouth-opening events per dive was 1.21 ± 1.69 (mean ± sd). Overall, 82% of mouth-openings occurred at the bottom of dives.3. As predicted, fur seals increased their inferred foraging time at the bottom of dives with increasing patch distance (depth), irrespective of the number of mouth-openings.4. For dives shallower than 55m, the mean bottom duration of dives without mouth-openings was shorter than for dives with mouth-opening events. However, this difference was only due to the occurrence of V-shaped dives with short bottom durations (0 or 1s). When removing those V-shaped dives, bottom duration was not related to the presence of mouth openings anymore. Thus, the decision to abandon foraging is likely related to other information about prey availability than prey capture attempts (i.e. sensory cues) that seals collect during the descent phase. We did not observe V-shaped dives for dives deeper than 55m, threshold beyond which the mean dive duration exceeded the apparent aerobic dive limit. For dives deeper than 55mAccepted Article This article is protected by copyright. All rights reserved.seals kept on foraging at bottom irrespective of the number of mouth-openings performed.5. Most dives occurred at shallower depths (30-55m) than the 60m depth of highest foraging efficiency (i.e. of greatest number of mouth-opening events per dive). This is likely related ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Functional Ecology 30 11 1834 1844 |
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 |
foraging strategies diving behaviour aerobic diving limit foraging depth Antarctic fur seals [SDE]Environmental Sciences |
spellingShingle |
foraging strategies diving behaviour aerobic diving limit foraging depth Antarctic fur seals [SDE]Environmental Sciences Viviant, Morgane Jeanniard-du-Dot, Tiphaine Monestiez, Pascal, Authier, Matthieu Guinet, Christophe Bottom time does not always predict prey encounter rate in Antarctic fur seals |
topic_facet |
foraging strategies diving behaviour aerobic diving limit foraging depth Antarctic fur seals [SDE]Environmental Sciences |
description |
Ministère de la Recherche, Université Pierre et Marie Curie International audience 1. Optimal foraging models applied to breath-holding divers predict that diving predators should optimize the time spent foraging at the bottom of dives depending on prey encounter rate, distance to prey patch (depth) and physiological constraints.2. We tested this hypothesis on a free-ranging diving marine predator, the Antarctic fur seal Arctocephalus gazella, equipped with accelerometers or Hall sensors (n=11) that recorded mouth-opening events, a proxy for prey capture attempts and thus feeding events. Over the 5896 dives analyzed (>15m depth), the mean number of mouth-opening events per dive was 1.21 ± 1.69 (mean ± sd). Overall, 82% of mouth-openings occurred at the bottom of dives.3. As predicted, fur seals increased their inferred foraging time at the bottom of dives with increasing patch distance (depth), irrespective of the number of mouth-openings.4. For dives shallower than 55m, the mean bottom duration of dives without mouth-openings was shorter than for dives with mouth-opening events. However, this difference was only due to the occurrence of V-shaped dives with short bottom durations (0 or 1s). When removing those V-shaped dives, bottom duration was not related to the presence of mouth openings anymore. Thus, the decision to abandon foraging is likely related to other information about prey availability than prey capture attempts (i.e. sensory cues) that seals collect during the descent phase. We did not observe V-shaped dives for dives deeper than 55m, threshold beyond which the mean dive duration exceeded the apparent aerobic dive limit. For dives deeper than 55mAccepted Article This article is protected by copyright. All rights reserved.seals kept on foraging at bottom irrespective of the number of mouth-openings performed.5. Most dives occurred at shallower depths (30-55m) than the 60m depth of highest foraging efficiency (i.e. of greatest number of mouth-opening events per dive). This is likely related ... |
author2 |
Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Fisheries Centre (Marine Mammal Research Unit) University of British Columbia (UBC) Biostatistique et Processus Spatiaux (BioSP) Institut National de la Recherche Agronomique (INRA) |
format |
Article in Journal/Newspaper |
author |
Viviant, Morgane Jeanniard-du-Dot, Tiphaine Monestiez, Pascal, Authier, Matthieu Guinet, Christophe |
author_facet |
Viviant, Morgane Jeanniard-du-Dot, Tiphaine Monestiez, Pascal, Authier, Matthieu Guinet, Christophe |
author_sort |
Viviant, Morgane |
title |
Bottom time does not always predict prey encounter rate in Antarctic fur seals |
title_short |
Bottom time does not always predict prey encounter rate in Antarctic fur seals |
title_full |
Bottom time does not always predict prey encounter rate in Antarctic fur seals |
title_fullStr |
Bottom time does not always predict prey encounter rate in Antarctic fur seals |
title_full_unstemmed |
Bottom time does not always predict prey encounter rate in Antarctic fur seals |
title_sort |
bottom time does not always predict prey encounter rate in antarctic fur seals |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.archives-ouvertes.fr/hal-01324015 https://doi.org/10.1111/1365-2435.12675 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Arctocephalus gazella |
op_source |
ISSN: 0269-8463 EISSN: 1365-2435 Functional Ecology https://hal.archives-ouvertes.fr/hal-01324015 Functional Ecology, Wiley, 2016, 30 (11), pp.1834-1844. ⟨10.1111/1365-2435.12675⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/1365-2435.12675 hal-01324015 https://hal.archives-ouvertes.fr/hal-01324015 doi:10.1111/1365-2435.12675 PRODINRA: 382078 WOS: 000387362600011 |
op_doi |
https://doi.org/10.1111/1365-2435.12675 |
container_title |
Functional Ecology |
container_volume |
30 |
container_issue |
11 |
container_start_page |
1834 |
op_container_end_page |
1844 |
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1766267035905425408 |