Three-dimensional space use during the bottom phase of southern elephant seal dives
International audience Background: In marine pelagic ecosystems, the spatial distribution of biomass is heterogeneous and dynamic. At large scales, physical processes are the main driving forces of biomass distribution. At fine scales, both biotic and abiotic parameters are likely to be key determin...
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ftccsdartic:oai:HAL:hal-01581978v1 2023-05-15T16:05:10+02:00 Three-dimensional space use during the bottom phase of southern elephant seal dives Le Bras, Yves Jouma'A, Joffrey 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) 2017-08-31 https://hal.archives-ouvertes.fr/hal-01581978 https://doi.org/10.1186/s40462-017-0108-y en eng HAL CCSD BioMed Central info:eu-repo/semantics/altIdentifier/doi/10.1186/s40462-017-0108-y hal-01581978 https://hal.archives-ouvertes.fr/hal-01581978 doi:10.1186/s40462-017-0108-y EISSN: 2051-3933 Movement Ecology https://hal.archives-ouvertes.fr/hal-01581978 Movement Ecology, BioMed Central, 2017, 5, pp.18. ⟨10.1186/s40462-017-0108-y⟩ Prey patch Prey distribution Diving behaviour Three-dimensional path reconstruction Prey density [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2017 ftccsdartic https://doi.org/10.1186/s40462-017-0108-y 2021-11-07T03:45:18Z International audience Background: In marine pelagic ecosystems, the spatial distribution of biomass is heterogeneous and dynamic. At large scales, physical processes are the main driving forces of biomass distribution. At fine scales, both biotic and abiotic parameters are likely to be key determinants in the horizontal and vertical distribution of biomass, with direct consequences on the foraging behaviour of diving predators. However, fine scale three-dimensional (3D) spatial interactions between diving predators and their prey are still poorly known. Results: We reconstructed and examined the patterns of southern elephant seals 3D path during the bottom phase of their dives, and related them to estimated prey encounter density. We found that southern elephant seal tracks at bottom are strongly dominated by a single horizontal direction. In high prey density areas, seals travelled shorter distances but their track remained strongly orientated according to a main linear direction. Horizontal, and more importantly, vertical deviations from this main direction, were related negatively to the estimated prey density. We found that prey encounter density decreased with diving depth but tended to be more predictable. Conclusion: Southern elephant seal behaviour during the bottom phase of their dives suggest that the prey are dispersed and distributed into layers in which their density relates to the vertical spread of the layer. The linear trajectories performed by the elephant seals would allow to explore the largest volume of water, maximizing the opportunities of prey encounter, while travelling great horizontal distances Article in Journal/Newspaper Elephant Seal Elephant Seals Southern Elephant Seal Southern Elephant Seals Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Movement Ecology 5 1 |
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 |
Prey patch Prey distribution Diving behaviour Three-dimensional path reconstruction Prey density [SDE]Environmental Sciences |
spellingShingle |
Prey patch Prey distribution Diving behaviour Three-dimensional path reconstruction Prey density [SDE]Environmental Sciences Le Bras, Yves Jouma'A, Joffrey Guinet, Christophe Three-dimensional space use during the bottom phase of southern elephant seal dives |
topic_facet |
Prey patch Prey distribution Diving behaviour Three-dimensional path reconstruction Prey density [SDE]Environmental Sciences |
description |
International audience Background: In marine pelagic ecosystems, the spatial distribution of biomass is heterogeneous and dynamic. At large scales, physical processes are the main driving forces of biomass distribution. At fine scales, both biotic and abiotic parameters are likely to be key determinants in the horizontal and vertical distribution of biomass, with direct consequences on the foraging behaviour of diving predators. However, fine scale three-dimensional (3D) spatial interactions between diving predators and their prey are still poorly known. Results: We reconstructed and examined the patterns of southern elephant seals 3D path during the bottom phase of their dives, and related them to estimated prey encounter density. We found that southern elephant seal tracks at bottom are strongly dominated by a single horizontal direction. In high prey density areas, seals travelled shorter distances but their track remained strongly orientated according to a main linear direction. Horizontal, and more importantly, vertical deviations from this main direction, were related negatively to the estimated prey density. We found that prey encounter density decreased with diving depth but tended to be more predictable. Conclusion: Southern elephant seal behaviour during the bottom phase of their dives suggest that the prey are dispersed and distributed into layers in which their density relates to the vertical spread of the layer. The linear trajectories performed by the elephant seals would allow to explore the largest volume of water, maximizing the opportunities of prey encounter, while travelling great horizontal distances |
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) |
format |
Article in Journal/Newspaper |
author |
Le Bras, Yves Jouma'A, Joffrey Guinet, Christophe |
author_facet |
Le Bras, Yves Jouma'A, Joffrey Guinet, Christophe |
author_sort |
Le Bras, Yves |
title |
Three-dimensional space use during the bottom phase of southern elephant seal dives |
title_short |
Three-dimensional space use during the bottom phase of southern elephant seal dives |
title_full |
Three-dimensional space use during the bottom phase of southern elephant seal dives |
title_fullStr |
Three-dimensional space use during the bottom phase of southern elephant seal dives |
title_full_unstemmed |
Three-dimensional space use during the bottom phase of southern elephant seal dives |
title_sort |
three-dimensional space use during the bottom phase of southern elephant seal dives |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.archives-ouvertes.fr/hal-01581978 https://doi.org/10.1186/s40462-017-0108-y |
genre |
Elephant Seal Elephant Seals Southern Elephant Seal Southern Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals Southern Elephant Seal Southern Elephant Seals |
op_source |
EISSN: 2051-3933 Movement Ecology https://hal.archives-ouvertes.fr/hal-01581978 Movement Ecology, BioMed Central, 2017, 5, pp.18. ⟨10.1186/s40462-017-0108-y⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1186/s40462-017-0108-y hal-01581978 https://hal.archives-ouvertes.fr/hal-01581978 doi:10.1186/s40462-017-0108-y |
op_doi |
https://doi.org/10.1186/s40462-017-0108-y |
container_title |
Movement Ecology |
container_volume |
5 |
container_issue |
1 |
_version_ |
1766400960841646080 |