Trade-offs between foraging efficiency and pup feeding rate of lactating northern fur seals in a declining population
International audience Foraging strategies and their resulting efficiency (energy gain to cost ratio) affectanimals’ survival and reproductive success and can be linked to population dynamics. However,they have rarely been studied quantitatively in free-ranging animals. We investigated foragingstrat...
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Online Access: | https://hal.science/hal-01904928 https://doi.org/10.3354/meps12638 |
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ftunivrochelle:oai:HAL:hal-01904928v1 2024-02-11T10:02:33+01:00 Trade-offs between foraging efficiency and pup feeding rate of lactating northern fur seals in a declining population Jeanniard Du Dot, Tiphaine Trites, Andrew W Arnould, John P. Y. Speakman, John R Guinet, C. Fisheries Centre (Marine Mammal Research Unit) University of British Columbia (UBC) Fisheries and Oceans Canada Maurice Lamontagne Institute Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) School of Life and Environmental Sciences, Faculty of Science and Technology Deakin University Burwood The Institute of Biological and Environmental Sciences 2018-07-30 https://hal.science/hal-01904928 https://doi.org/10.3354/meps12638 en eng HAL CCSD Inter Research info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12638 hal-01904928 https://hal.science/hal-01904928 doi:10.3354/meps12638 ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-01904928 Marine Ecology Progress Series, 2018, 600, pp.207 - 222. ⟨10.3354/meps12638⟩ Foraging efficiency Reproduction success Northern fur seal Pup growth Diet [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2018 ftunivrochelle https://doi.org/10.3354/meps12638 2024-01-23T23:35:21Z International audience Foraging strategies and their resulting efficiency (energy gain to cost ratio) affectanimals’ survival and reproductive success and can be linked to population dynamics. However,they have rarely been studied quantitatively in free-ranging animals. We investigated foragingstrategies and efficiencies of wild northern fur seals Callorhinus ursinus during their breedingseason to understand potential links to the observed population decline in the Bering Sea. Weequipped 20 lactating females with biologgers to determine at-sea foraging behaviours. We measuredenergy expenditure while foraging using the doubly-labelled water method, and energygained using (1) the types and energy densities of prey consumed, and (2) the number of prey captureattempts (from acceleration data). Our results show that seals employed 2 foraging strategies:one group (40%) fed mostly in oceanic waters on small, high energy-density prey, while the other(60%) stayed over the shallow continental shelf feeding mostly on larger, lower quality fish.Females foraging in oceanic waters captured 3 times more prey, and had double the foraging efficienciesof females that foraged on-shelf in neritic waters. However, neritic seals made comparativelyshorter trips, and likely fed their pups ~20 to 25% more frequently. The presence of thesestrategies which either favor foraging efficiency (energy) or frequency of nursing (time) might bemaintained in the population because they have similar net fitness outcomes. However, neitherstrategy appears to simultaneously maximize time and energy allocated to nursing, with potentialimpacts on the survival of pups during their first year at sea. Article in Journal/Newspaper Bering Sea Callorhinus ursinus Northern fur seal HAL - Université de La Rochelle Bering Sea Marine Ecology Progress Series 600 207 222 |
institution |
Open Polar |
collection |
HAL - Université de La Rochelle |
op_collection_id |
ftunivrochelle |
language |
English |
topic |
Foraging efficiency Reproduction success Northern fur seal Pup growth Diet [SDE]Environmental Sciences |
spellingShingle |
Foraging efficiency Reproduction success Northern fur seal Pup growth Diet [SDE]Environmental Sciences Jeanniard Du Dot, Tiphaine Trites, Andrew W Arnould, John P. Y. Speakman, John R Guinet, C. Trade-offs between foraging efficiency and pup feeding rate of lactating northern fur seals in a declining population |
topic_facet |
Foraging efficiency Reproduction success Northern fur seal Pup growth Diet [SDE]Environmental Sciences |
description |
International audience Foraging strategies and their resulting efficiency (energy gain to cost ratio) affectanimals’ survival and reproductive success and can be linked to population dynamics. However,they have rarely been studied quantitatively in free-ranging animals. We investigated foragingstrategies and efficiencies of wild northern fur seals Callorhinus ursinus during their breedingseason to understand potential links to the observed population decline in the Bering Sea. Weequipped 20 lactating females with biologgers to determine at-sea foraging behaviours. We measuredenergy expenditure while foraging using the doubly-labelled water method, and energygained using (1) the types and energy densities of prey consumed, and (2) the number of prey captureattempts (from acceleration data). Our results show that seals employed 2 foraging strategies:one group (40%) fed mostly in oceanic waters on small, high energy-density prey, while the other(60%) stayed over the shallow continental shelf feeding mostly on larger, lower quality fish.Females foraging in oceanic waters captured 3 times more prey, and had double the foraging efficienciesof females that foraged on-shelf in neritic waters. However, neritic seals made comparativelyshorter trips, and likely fed their pups ~20 to 25% more frequently. The presence of thesestrategies which either favor foraging efficiency (energy) or frequency of nursing (time) might bemaintained in the population because they have similar net fitness outcomes. However, neitherstrategy appears to simultaneously maximize time and energy allocated to nursing, with potentialimpacts on the survival of pups during their first year at sea. |
author2 |
Fisheries Centre (Marine Mammal Research Unit) University of British Columbia (UBC) Fisheries and Oceans Canada Maurice Lamontagne Institute Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) School of Life and Environmental Sciences, Faculty of Science and Technology Deakin University Burwood The Institute of Biological and Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Jeanniard Du Dot, Tiphaine Trites, Andrew W Arnould, John P. Y. Speakman, John R Guinet, C. |
author_facet |
Jeanniard Du Dot, Tiphaine Trites, Andrew W Arnould, John P. Y. Speakman, John R Guinet, C. |
author_sort |
Jeanniard Du Dot, Tiphaine |
title |
Trade-offs between foraging efficiency and pup feeding rate of lactating northern fur seals in a declining population |
title_short |
Trade-offs between foraging efficiency and pup feeding rate of lactating northern fur seals in a declining population |
title_full |
Trade-offs between foraging efficiency and pup feeding rate of lactating northern fur seals in a declining population |
title_fullStr |
Trade-offs between foraging efficiency and pup feeding rate of lactating northern fur seals in a declining population |
title_full_unstemmed |
Trade-offs between foraging efficiency and pup feeding rate of lactating northern fur seals in a declining population |
title_sort |
trade-offs between foraging efficiency and pup feeding rate of lactating northern fur seals in a declining population |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-01904928 https://doi.org/10.3354/meps12638 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea Callorhinus ursinus Northern fur seal |
genre_facet |
Bering Sea Callorhinus ursinus Northern fur seal |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-01904928 Marine Ecology Progress Series, 2018, 600, pp.207 - 222. ⟨10.3354/meps12638⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12638 hal-01904928 https://hal.science/hal-01904928 doi:10.3354/meps12638 |
op_doi |
https://doi.org/10.3354/meps12638 |
container_title |
Marine Ecology Progress Series |
container_volume |
600 |
container_start_page |
207 |
op_container_end_page |
222 |
_version_ |
1790598571155783680 |