High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability
International audience High juvenile mortality rates are typical of many long‐lived marine vertebrate predators. Insufficient development in dive and forage ability is considered a key driver of this. However, direct links to survival outcome are sparse, particularly in free‐ranging marine animals t...
Published in: | Ecology and Evolution |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Online Access: | https://hal.science/hal-02414007 https://hal.science/hal-02414007/document https://hal.science/hal-02414007/file/ece3.5905.pdf https://doi.org/10.1002/ece3.5905 |
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ftunivrochelle:oai:HAL:hal-02414007v1 |
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openpolar |
institution |
Open Polar |
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HAL - Université de La Rochelle |
op_collection_id |
ftunivrochelle |
language |
English |
topic |
Mirounga leonina southern elephant seal survival analyses bio-logging early life foraging ecology juvenile mortality [SDE]Environmental Sciences |
spellingShingle |
Mirounga leonina southern elephant seal survival analyses bio-logging early life foraging ecology juvenile mortality [SDE]Environmental Sciences Cox, Sam Authier, Matthieu Orgeret, Florian Weimerskirch, Henri Guinet, Christophe High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability |
topic_facet |
Mirounga leonina southern elephant seal survival analyses bio-logging early life foraging ecology juvenile mortality [SDE]Environmental Sciences |
description |
International audience High juvenile mortality rates are typical of many long‐lived marine vertebrate predators. Insufficient development in dive and forage ability is considered a key driver of this. However, direct links to survival outcome are sparse, particularly in free‐ranging marine animals that may not return to land. In this study, we conduct exploratory investigations toward early mortality in juvenile southern elephant seals Mirounga leonina. Twenty postweaning pups were equipped with (a) a new‐generation satellite relay data tag, capable of remotely transmitting fine‐scale behavioral movements from accelerometers, and (b) a location transmitting only tag (so that mortality events could be distinguished from device failures). Individuals were followed during their first trip at sea (until mortality or return to land). Two analyses were conducted. First, the behavioral movements and encountered environmental conditions of nonsurviving pups were individually compared to temporally concurrent observations from grouped survivors. Second, common causes of mortality were investigated using Cox's proportional hazard regression and penalized shrinkage techniques. Nine individuals died (two females and seven males) and 11 survived (eight females and three males). All but one individual died before the return phase of their first trip at sea, and all but one were negatively buoyant. Causes of death were variable, although common factors included increased horizontal travel speeds and distances, decreased development in dive and forage ability, and habitat type visited (lower sea surface temperatures and decreased total [eddy] kinetic energy). For long‐lived marine vertebrate predators, such as the southern elephant seal, the first few months of life following independence represent a critical period, when small deviations in behavior from the norm appear sufficient to increase mortality risk. Survival rates may subsequently be particularly vulnerable to changes in climate and environment, which will have ... |
author2 |
MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Centre National d'Études Spatiales Toulouse (CNES) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Observatoire pour la Conservation de la Mégafaune Marine (PELAGIS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) ADERA Pessac, France ADERA |
format |
Article in Journal/Newspaper |
author |
Cox, Sam Authier, Matthieu Orgeret, Florian Weimerskirch, Henri Guinet, Christophe |
author_facet |
Cox, Sam Authier, Matthieu Orgeret, Florian Weimerskirch, Henri Guinet, Christophe |
author_sort |
Cox, Sam |
title |
High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability |
title_short |
High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability |
title_full |
High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability |
title_fullStr |
High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability |
title_full_unstemmed |
High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability |
title_sort |
high mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02414007 https://hal.science/hal-02414007/document https://hal.science/hal-02414007/file/ece3.5905.pdf https://doi.org/10.1002/ece3.5905 |
genre |
Elephant Seal Elephant Seals Mirounga leonina Southern Elephant Seal Southern Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals Mirounga leonina Southern Elephant Seal Southern Elephant Seals |
op_source |
EISSN: 2045-7758 Ecology and Evolution https://hal.science/hal-02414007 Ecology and Evolution, 2020, 10 (1), pp.410-430. ⟨10.1002/ece3.5905⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.5905 hal-02414007 https://hal.science/hal-02414007 https://hal.science/hal-02414007/document https://hal.science/hal-02414007/file/ece3.5905.pdf doi:10.1002/ece3.5905 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/ece3.5905 |
container_title |
Ecology and Evolution |
container_volume |
10 |
container_issue |
1 |
container_start_page |
410 |
op_container_end_page |
430 |
_version_ |
1790599742770642944 |
spelling |
ftunivrochelle:oai:HAL:hal-02414007v1 2024-02-11T10:03:29+01:00 High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability Cox, Sam Authier, Matthieu Orgeret, Florian Weimerskirch, Henri Guinet, Christophe MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Centre National d'Études Spatiales Toulouse (CNES) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Observatoire pour la Conservation de la Mégafaune Marine (PELAGIS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) ADERA Pessac, France ADERA 2020 https://hal.science/hal-02414007 https://hal.science/hal-02414007/document https://hal.science/hal-02414007/file/ece3.5905.pdf https://doi.org/10.1002/ece3.5905 en eng HAL CCSD Wiley Open Access info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.5905 hal-02414007 https://hal.science/hal-02414007 https://hal.science/hal-02414007/document https://hal.science/hal-02414007/file/ece3.5905.pdf doi:10.1002/ece3.5905 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess EISSN: 2045-7758 Ecology and Evolution https://hal.science/hal-02414007 Ecology and Evolution, 2020, 10 (1), pp.410-430. ⟨10.1002/ece3.5905⟩ Mirounga leonina southern elephant seal survival analyses bio-logging early life foraging ecology juvenile mortality [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2020 ftunivrochelle https://doi.org/10.1002/ece3.5905 2024-01-23T23:34:42Z International audience High juvenile mortality rates are typical of many long‐lived marine vertebrate predators. Insufficient development in dive and forage ability is considered a key driver of this. However, direct links to survival outcome are sparse, particularly in free‐ranging marine animals that may not return to land. In this study, we conduct exploratory investigations toward early mortality in juvenile southern elephant seals Mirounga leonina. Twenty postweaning pups were equipped with (a) a new‐generation satellite relay data tag, capable of remotely transmitting fine‐scale behavioral movements from accelerometers, and (b) a location transmitting only tag (so that mortality events could be distinguished from device failures). Individuals were followed during their first trip at sea (until mortality or return to land). Two analyses were conducted. First, the behavioral movements and encountered environmental conditions of nonsurviving pups were individually compared to temporally concurrent observations from grouped survivors. Second, common causes of mortality were investigated using Cox's proportional hazard regression and penalized shrinkage techniques. Nine individuals died (two females and seven males) and 11 survived (eight females and three males). All but one individual died before the return phase of their first trip at sea, and all but one were negatively buoyant. Causes of death were variable, although common factors included increased horizontal travel speeds and distances, decreased development in dive and forage ability, and habitat type visited (lower sea surface temperatures and decreased total [eddy] kinetic energy). For long‐lived marine vertebrate predators, such as the southern elephant seal, the first few months of life following independence represent a critical period, when small deviations in behavior from the norm appear sufficient to increase mortality risk. Survival rates may subsequently be particularly vulnerable to changes in climate and environment, which will have ... Article in Journal/Newspaper Elephant Seal Elephant Seals Mirounga leonina Southern Elephant Seal Southern Elephant Seals HAL - Université de La Rochelle Ecology and Evolution 10 1 410 430 |