Evaluation of the foraging performance and types of prey consumed by female elephant seals in the Valdes Peninsulaand the Kerguelen Islands
The distribution and abundance of marine resources are subject to variations in environmental parameters. The ability of marine predators, such as the southern elephant seals (SES), Mirounga leonina, to forage efficiently can determine their net energy gain. In this study, 16 SES females from the Ke...
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HAL CCSD
2020
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ftunivnantes:oai:HAL:dumas-03038305v1 2023-05-15T16:05:25+02:00 Evaluation of the foraging performance and types of prey consumed by female elephant seals in the Valdes Peninsulaand the Kerguelen Islands Évaluation des performances d'acquisition et des types de proies consommées par les femelles éléphants de mer de la Péninsule Valdés et des Îles Kerguelen Dameron, Nolwenn AGROCAMPUS OUEST Centre d'études biologiques de Chizé (CEBC), 405 route de Prissé la Charrière, 79360 Villiers-en-Bois Didier Le Coeur Christophe Guinet 2020-09-18 https://dumas.ccsd.cnrs.fr/dumas-03038305 https://dumas.ccsd.cnrs.fr/dumas-03038305/document https://dumas.ccsd.cnrs.fr/dumas-03038305/file/2020_Dameron_Nolwenn_GE.pdf fr fre HAL CCSD dumas-03038305 https://dumas.ccsd.cnrs.fr/dumas-03038305 https://dumas.ccsd.cnrs.fr/dumas-03038305/document https://dumas.ccsd.cnrs.fr/dumas-03038305/file/2020_Dameron_Nolwenn_GE.pdf http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess CC-BY-NC-ND https://dumas.ccsd.cnrs.fr/dumas-03038305 Sciences de l'environnement. 2020 Elephant seal Mirounga leonina Diving behaviour Foraging success Prey Drift rate Density Valdes Peninsula Kerguelen Éléphant de mer Comportement de plongée Succès de pêche Proies Taux de dérive Densité Péninsule Valdés [SDE]Environmental Sciences info:eu-repo/semantics/masterThesis Master thesis 2020 ftunivnantes 2022-11-16T00:47:59Z The distribution and abundance of marine resources are subject to variations in environmental parameters. The ability of marine predators, such as the southern elephant seals (SES), Mirounga leonina, to forage efficiently can determine their net energy gain. In this study, 16 SES females from the Kerguelen Islands (KER) and 12 SES females from the Valdes Peninsula (VP) were equipped with time-depth recorders (TDRs) and accelerometers to compare the foraging performance and types of prey consumed by these two geographically distant colonies. Data from the accelerometers allow for the number of prey capture attempts (PCAs) and the body condition of the animals to be estimated from the drift rate. The following behavioural parameters were studied as a function of the locations, the temperature at 200 m, and the difference in light intensity between the surface and 150 m, using linear mixed models: 1) the depth of the dive, 2) the duration of the bottom phase, 3) the swimming effort in the bottom phase and 4) the number of PCAs in the bottom phase. The results obtained do not show any difference in dive depth, bottom phase duration, or bottom phase swimming effort between the two populations. However, KER individuals have three times the number of PCAs than VP individuals. In addition, KER females leave for the ocean in poorer physical condition than VP females and improve their body condition slower than VP females. These results suggest that the prey caught by these two populations of SES are different. Future studies should aim to more accurately identify the prey consumed by elephant seals and assess their net foraging success, in order to compare the foraging performance of these two colonies. La distribution et l’abondance des ressources marines sont soumises aux variations des paramètres environnementaux. La capacité des prédateurs marins tels que les éléphants de mer austraux (EMS), Mirounga leonina, à pêcher efficacement détermine leur gain net d’énergie. Dans cette étude, 16 femelles EMS originaires des ... Master Thesis Elephant Seal Elephant Seals Kerguelen Islands Mirounga leonina Southern Elephant Seals Université de Nantes: HAL-UNIV-NANTES Îles Kerguelen ENVELOPE(69.167,69.167,-49.250,-49.250) Kerguelen Kerguelen Islands |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
French |
topic |
Elephant seal Mirounga leonina Diving behaviour Foraging success Prey Drift rate Density Valdes Peninsula Kerguelen Éléphant de mer Comportement de plongée Succès de pêche Proies Taux de dérive Densité Péninsule Valdés [SDE]Environmental Sciences |
spellingShingle |
Elephant seal Mirounga leonina Diving behaviour Foraging success Prey Drift rate Density Valdes Peninsula Kerguelen Éléphant de mer Comportement de plongée Succès de pêche Proies Taux de dérive Densité Péninsule Valdés [SDE]Environmental Sciences Dameron, Nolwenn Evaluation of the foraging performance and types of prey consumed by female elephant seals in the Valdes Peninsulaand the Kerguelen Islands |
topic_facet |
Elephant seal Mirounga leonina Diving behaviour Foraging success Prey Drift rate Density Valdes Peninsula Kerguelen Éléphant de mer Comportement de plongée Succès de pêche Proies Taux de dérive Densité Péninsule Valdés [SDE]Environmental Sciences |
description |
The distribution and abundance of marine resources are subject to variations in environmental parameters. The ability of marine predators, such as the southern elephant seals (SES), Mirounga leonina, to forage efficiently can determine their net energy gain. In this study, 16 SES females from the Kerguelen Islands (KER) and 12 SES females from the Valdes Peninsula (VP) were equipped with time-depth recorders (TDRs) and accelerometers to compare the foraging performance and types of prey consumed by these two geographically distant colonies. Data from the accelerometers allow for the number of prey capture attempts (PCAs) and the body condition of the animals to be estimated from the drift rate. The following behavioural parameters were studied as a function of the locations, the temperature at 200 m, and the difference in light intensity between the surface and 150 m, using linear mixed models: 1) the depth of the dive, 2) the duration of the bottom phase, 3) the swimming effort in the bottom phase and 4) the number of PCAs in the bottom phase. The results obtained do not show any difference in dive depth, bottom phase duration, or bottom phase swimming effort between the two populations. However, KER individuals have three times the number of PCAs than VP individuals. In addition, KER females leave for the ocean in poorer physical condition than VP females and improve their body condition slower than VP females. These results suggest that the prey caught by these two populations of SES are different. Future studies should aim to more accurately identify the prey consumed by elephant seals and assess their net foraging success, in order to compare the foraging performance of these two colonies. La distribution et l’abondance des ressources marines sont soumises aux variations des paramètres environnementaux. La capacité des prédateurs marins tels que les éléphants de mer austraux (EMS), Mirounga leonina, à pêcher efficacement détermine leur gain net d’énergie. Dans cette étude, 16 femelles EMS originaires des ... |
author2 |
AGROCAMPUS OUEST Centre d'études biologiques de Chizé (CEBC), 405 route de Prissé la Charrière, 79360 Villiers-en-Bois Didier Le Coeur Christophe Guinet |
format |
Master Thesis |
author |
Dameron, Nolwenn |
author_facet |
Dameron, Nolwenn |
author_sort |
Dameron, Nolwenn |
title |
Evaluation of the foraging performance and types of prey consumed by female elephant seals in the Valdes Peninsulaand the Kerguelen Islands |
title_short |
Evaluation of the foraging performance and types of prey consumed by female elephant seals in the Valdes Peninsulaand the Kerguelen Islands |
title_full |
Evaluation of the foraging performance and types of prey consumed by female elephant seals in the Valdes Peninsulaand the Kerguelen Islands |
title_fullStr |
Evaluation of the foraging performance and types of prey consumed by female elephant seals in the Valdes Peninsulaand the Kerguelen Islands |
title_full_unstemmed |
Evaluation of the foraging performance and types of prey consumed by female elephant seals in the Valdes Peninsulaand the Kerguelen Islands |
title_sort |
evaluation of the foraging performance and types of prey consumed by female elephant seals in the valdes peninsulaand the kerguelen islands |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://dumas.ccsd.cnrs.fr/dumas-03038305 https://dumas.ccsd.cnrs.fr/dumas-03038305/document https://dumas.ccsd.cnrs.fr/dumas-03038305/file/2020_Dameron_Nolwenn_GE.pdf |
long_lat |
ENVELOPE(69.167,69.167,-49.250,-49.250) |
geographic |
Îles Kerguelen Kerguelen Kerguelen Islands |
geographic_facet |
Îles Kerguelen Kerguelen Kerguelen Islands |
genre |
Elephant Seal Elephant Seals Kerguelen Islands Mirounga leonina Southern Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals Kerguelen Islands Mirounga leonina Southern Elephant Seals |
op_source |
https://dumas.ccsd.cnrs.fr/dumas-03038305 Sciences de l'environnement. 2020 |
op_relation |
dumas-03038305 https://dumas.ccsd.cnrs.fr/dumas-03038305 https://dumas.ccsd.cnrs.fr/dumas-03038305/document https://dumas.ccsd.cnrs.fr/dumas-03038305/file/2020_Dameron_Nolwenn_GE.pdf |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766401315428106240 |