Fine-scale foraging effort and efficiency of Macaroni penguins is influenced by prey type, patch density and temporal dynamics
International audience Difficulties quantifying in situ prey patch quality have limited our understanding of how marine predators respond to variation within and between patches, and throughout their foraging range. In the present study, animal-borne video, GPS, accelerometer and dive behaviour data...
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ftunivrochelle:oai:HAL:hal-03138541v1 2024-02-11T10:03:36+01:00 Fine-scale foraging effort and efficiency of Macaroni penguins is influenced by prey type, patch density and temporal dynamics Sutton, G. Bost, Charles-André Kouzani, A. Adams, S. Mitchell, K. Arnould, J. 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) 2021-01 https://hal.science/hal-03138541 https://doi.org/10.1007/s00227-020-03811-w en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-020-03811-w hal-03138541 https://hal.science/hal-03138541 doi:10.1007/s00227-020-03811-w ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-03138541 Marine Biology, 2021, 168 (1), ⟨10.1007/s00227-020-03811-w⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftunivrochelle https://doi.org/10.1007/s00227-020-03811-w 2024-01-23T23:34:47Z International audience Difficulties quantifying in situ prey patch quality have limited our understanding of how marine predators respond to variation within and between patches, and throughout their foraging range. In the present study, animal-borne video, GPS, accelerometer and dive behaviour data loggers were used to investigate the fine-scale foraging behaviour of Macaroni penguins (Eudyptes chrysolophus) in response to prey type, patch density and temporal variation in diving behaviour. Individuals mainly dived during the day and utilised two strategies, targeting different prey types. Subantarctic krill (Euphausia vallentini) were consumed during deep dives, while small soft-bodied fish were captured on shallow dives or during the ascent phase of deep dives. Despite breeding in large colonies individuals seemed to be solitary foragers and did not engage with conspecifics in coordinated behaviour as seen in other group foraging penguin species. This potentially reflects the high abundance and low manoeuvrability of krill. Video data were used to validate prey capture signals in accelerometer data and a Support Vector Machine learning algorithm was developed to identify prey captures that occurred throughout the entire foraging trip. Prey capture rates indicated that Macaroni penguins continued to forage beyond the optimal give up time. However, bout-scale analysis revealed individuals terminated diving behaviour for reasons other than patch quality. These findings indicate that individuals make complex foraging decisions in relation to their proximate environment over multiple spatio-temporal scales. Article in Journal/Newspaper Eudyptes chrysolophus HAL - Université de La Rochelle Marine Biology 168 1 |
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Open Polar |
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HAL - Université de La Rochelle |
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ftunivrochelle |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Sutton, G. Bost, Charles-André Kouzani, A. Adams, S. Mitchell, K. Arnould, J. Fine-scale foraging effort and efficiency of Macaroni penguins is influenced by prey type, patch density and temporal dynamics |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Difficulties quantifying in situ prey patch quality have limited our understanding of how marine predators respond to variation within and between patches, and throughout their foraging range. In the present study, animal-borne video, GPS, accelerometer and dive behaviour data loggers were used to investigate the fine-scale foraging behaviour of Macaroni penguins (Eudyptes chrysolophus) in response to prey type, patch density and temporal variation in diving behaviour. Individuals mainly dived during the day and utilised two strategies, targeting different prey types. Subantarctic krill (Euphausia vallentini) were consumed during deep dives, while small soft-bodied fish were captured on shallow dives or during the ascent phase of deep dives. Despite breeding in large colonies individuals seemed to be solitary foragers and did not engage with conspecifics in coordinated behaviour as seen in other group foraging penguin species. This potentially reflects the high abundance and low manoeuvrability of krill. Video data were used to validate prey capture signals in accelerometer data and a Support Vector Machine learning algorithm was developed to identify prey captures that occurred throughout the entire foraging trip. Prey capture rates indicated that Macaroni penguins continued to forage beyond the optimal give up time. However, bout-scale analysis revealed individuals terminated diving behaviour for reasons other than patch quality. These findings indicate that individuals make complex foraging decisions in relation to their proximate environment over multiple spatio-temporal scales. |
author2 |
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) |
format |
Article in Journal/Newspaper |
author |
Sutton, G. Bost, Charles-André Kouzani, A. Adams, S. Mitchell, K. Arnould, J. |
author_facet |
Sutton, G. Bost, Charles-André Kouzani, A. Adams, S. Mitchell, K. Arnould, J. |
author_sort |
Sutton, G. |
title |
Fine-scale foraging effort and efficiency of Macaroni penguins is influenced by prey type, patch density and temporal dynamics |
title_short |
Fine-scale foraging effort and efficiency of Macaroni penguins is influenced by prey type, patch density and temporal dynamics |
title_full |
Fine-scale foraging effort and efficiency of Macaroni penguins is influenced by prey type, patch density and temporal dynamics |
title_fullStr |
Fine-scale foraging effort and efficiency of Macaroni penguins is influenced by prey type, patch density and temporal dynamics |
title_full_unstemmed |
Fine-scale foraging effort and efficiency of Macaroni penguins is influenced by prey type, patch density and temporal dynamics |
title_sort |
fine-scale foraging effort and efficiency of macaroni penguins is influenced by prey type, patch density and temporal dynamics |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03138541 https://doi.org/10.1007/s00227-020-03811-w |
genre |
Eudyptes chrysolophus |
genre_facet |
Eudyptes chrysolophus |
op_source |
ISSN: 0025-3162 EISSN: 1432-1793 Marine Biology https://hal.science/hal-03138541 Marine Biology, 2021, 168 (1), ⟨10.1007/s00227-020-03811-w⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-020-03811-w hal-03138541 https://hal.science/hal-03138541 doi:10.1007/s00227-020-03811-w |
op_doi |
https://doi.org/10.1007/s00227-020-03811-w |
container_title |
Marine Biology |
container_volume |
168 |
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1 |
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1790599884484640768 |