Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour.
International audience : Mature female southern elephant seals come ashore only in October to breed and in January to moult, spending the rest of the year foraging at sea. Mature females may lose as much as 50% of their body mass, mostly in lipid stores, during the breeding season due to fasting and...
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Online Access: | https://hal.science/hal-00998963 https://doi.org/10.1242/jeb.088542 |
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ftunivnantes:oai:HAL:hal-00998963v1 2023-05-15T16:05:22+02:00 Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour. Richard, Gaëtan Vacquié-Garcia, Jade Jouma'A, Joffrey Picard, Baptiste Génin, Alexandre Arnould, John P y Bailleul, Frédéric Guinet, Christophe 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 Deakin University Burwood 2014-05-06 https://hal.science/hal-00998963 https://doi.org/10.1242/jeb.088542 en eng HAL CCSD The Company of Biologists info:eu-repo/semantics/altIdentifier/doi/10.1242/jeb.088542 info:eu-repo/semantics/altIdentifier/pmid/24803471 hal-00998963 https://hal.science/hal-00998963 doi:10.1242/jeb.088542 PUBMED: 24803471 ISSN: 0022-0949 EISSN: 1477-9145 Journal of Experimental Biology https://hal.science/hal-00998963 Journal of Experimental Biology, 2014, 217, pp.2609-2619. ⟨10.1242/jeb.088542⟩ body condition density buoyancy speed swimming effort elephant seal [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2014 ftunivnantes https://doi.org/10.1242/jeb.088542 2023-02-14T23:49:11Z International audience : Mature female southern elephant seals come ashore only in October to breed and in January to moult, spending the rest of the year foraging at sea. Mature females may lose as much as 50% of their body mass, mostly in lipid stores, during the breeding season due to fasting and lactation. When departing to sea, post-breeding females are negatively buoyant and the relative change in body condition (i.e. density) during the foraging trip has previously been assessed by monitoring descent rate during drift dives. However, relatively few drift dives are performed resulting in low resolution of the temporal reconstruction of body condition change. In this study, six post-breeding females were instrumented with time-depth recorders and accelerometers to investigate whether changes in active swimming effort and speed could be used as an alternative method of monitoring density variations throughout the foraging trip. In addition, we assessed consequences of density change on the swimming effort of individuals while diving and effects on dive duration. Both descent swimming speed and ascent swimming effort were found to be strongly correlated to descent rate during drift dives, enabling the fine-scale monitoring of seal density change over the whole trip. Negatively buoyant seals minimized swimming effort during descents, gliding down at slower speeds, and reduced their ascent swimming effort to maintain a nearly constant swimming speed as their buoyancy increased. One percent of seal density variation over time was found to induce a 20% variation in swimming effort during dives with direct consequences on dive duration. Article in Journal/Newspaper Elephant Seal Elephant Seals Southern Elephant Seals Université de Nantes: HAL-UNIV-NANTES Journal of Experimental Biology |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
body condition density buoyancy speed swimming effort elephant seal [SDE]Environmental Sciences |
spellingShingle |
body condition density buoyancy speed swimming effort elephant seal [SDE]Environmental Sciences Richard, Gaëtan Vacquié-Garcia, Jade Jouma'A, Joffrey Picard, Baptiste Génin, Alexandre Arnould, John P y Bailleul, Frédéric Guinet, Christophe Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour. |
topic_facet |
body condition density buoyancy speed swimming effort elephant seal [SDE]Environmental Sciences |
description |
International audience : Mature female southern elephant seals come ashore only in October to breed and in January to moult, spending the rest of the year foraging at sea. Mature females may lose as much as 50% of their body mass, mostly in lipid stores, during the breeding season due to fasting and lactation. When departing to sea, post-breeding females are negatively buoyant and the relative change in body condition (i.e. density) during the foraging trip has previously been assessed by monitoring descent rate during drift dives. However, relatively few drift dives are performed resulting in low resolution of the temporal reconstruction of body condition change. In this study, six post-breeding females were instrumented with time-depth recorders and accelerometers to investigate whether changes in active swimming effort and speed could be used as an alternative method of monitoring density variations throughout the foraging trip. In addition, we assessed consequences of density change on the swimming effort of individuals while diving and effects on dive duration. Both descent swimming speed and ascent swimming effort were found to be strongly correlated to descent rate during drift dives, enabling the fine-scale monitoring of seal density change over the whole trip. Negatively buoyant seals minimized swimming effort during descents, gliding down at slower speeds, and reduced their ascent swimming effort to maintain a nearly constant swimming speed as their buoyancy increased. One percent of seal density variation over time was found to induce a 20% variation in swimming effort during dives with direct consequences on dive duration. |
author2 |
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 Deakin University Burwood |
format |
Article in Journal/Newspaper |
author |
Richard, Gaëtan Vacquié-Garcia, Jade Jouma'A, Joffrey Picard, Baptiste Génin, Alexandre Arnould, John P y Bailleul, Frédéric Guinet, Christophe |
author_facet |
Richard, Gaëtan Vacquié-Garcia, Jade Jouma'A, Joffrey Picard, Baptiste Génin, Alexandre Arnould, John P y Bailleul, Frédéric Guinet, Christophe |
author_sort |
Richard, Gaëtan |
title |
Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour. |
title_short |
Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour. |
title_full |
Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour. |
title_fullStr |
Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour. |
title_full_unstemmed |
Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour. |
title_sort |
variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour. |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-00998963 https://doi.org/10.1242/jeb.088542 |
genre |
Elephant Seal Elephant Seals Southern Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals Southern Elephant Seals |
op_source |
ISSN: 0022-0949 EISSN: 1477-9145 Journal of Experimental Biology https://hal.science/hal-00998963 Journal of Experimental Biology, 2014, 217, pp.2609-2619. ⟨10.1242/jeb.088542⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1242/jeb.088542 info:eu-repo/semantics/altIdentifier/pmid/24803471 hal-00998963 https://hal.science/hal-00998963 doi:10.1242/jeb.088542 PUBMED: 24803471 |
op_doi |
https://doi.org/10.1242/jeb.088542 |
container_title |
Journal of Experimental Biology |
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1766401269271887872 |