Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations?
9 pages International audience It is generally assumed that air-breathing aquatic animals always choose the shortest route to minimize duration for transit between the surface and foraging depth in order to maximize the proportion of time spent foraging. However, empirical data indicate that the bod...
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Online Access: | https://hal.archives-ouvertes.fr/hal-00187100 https://doi.org/10.1242/jeb.01265 |
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ftccsdartic:oai:HAL:hal-00187100v1 2023-05-15T16:08:23+02:00 Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations? Sato, Katsufumi Charrassin, Jean-Benoît Bost, Charles-André Naito, Yasuhiko National Institute of Polar Research Tokyo (NiPR) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) 2004-08 https://hal.archives-ouvertes.fr/hal-00187100 https://doi.org/10.1242/jeb.01265 en eng HAL CCSD The Company of Biologists info:eu-repo/semantics/altIdentifier/doi/10.1242/jeb.01265 hal-00187100 https://hal.archives-ouvertes.fr/hal-00187100 doi:10.1242/jeb.01265 ISSN: 0022-0949 EISSN: 1477-9145 Journal of Experimental Biology https://hal.archives-ouvertes.fr/hal-00187100 Journal of Experimental Biology, The Company of Biologists, 2004, 207, pp.4057-4065. ⟨10.1242/jeb.01265⟩ http://jeb.biologists.org/content/207/23/4057 penguin data logger acceleration dive horizontal transit gliding stroke buoyancy Eudyptes chrysolophus [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society info:eu-repo/semantics/article Journal articles 2004 ftccsdartic https://doi.org/10.1242/jeb.01265 2021-11-28T01:41:58Z 9 pages International audience It is generally assumed that air-breathing aquatic animals always choose the shortest route to minimize duration for transit between the surface and foraging depth in order to maximize the proportion of time spent foraging. However, empirical data indicate that the body angles of some diving animals are rarely vertical during descent and ascent. Why do they choose shallower body angles that result in longer descent and ascent durations? To investigate this question, we attached acceleration data loggers to eight female macaroni penguins, breeding on the Kerguelen Islands (48°45¢–50°00¢ S, 68°45¢–70°58¢ E; South Indian Ocean), to record depth, two-dimensional acceleration (stroke cycle frequency and body angle) and temperature. We investigated how they controlled body angle and allocated their submerged time. The instrumented females performed multiple dives (N=6952) with a mean dive depth for each bird ranging from 24.5±28.5·m to 56.4±75.1·m. Mean body angles during descent and ascent were not vertical. There was large variation in mean descent and ascent angles for a given dive depth, which, in turn, caused large variation in descent and ascent duration. Body angles were significantly correlated with time spent at the bottomphase of the dive. Birds that spent long periods at the bottom exhibited steep body angles during ascent and subsequent descent. By contrast, they adopted shallow body angles after they had short or no bottom phases. Our results suggest that macaroni penguins stay at the bottom longer after encountering a good prey patch and then travel to the surface at steep body angles. If they do not encounter prey, they discontinue the dive, without staying at the bottom, ascend at shallow body angles and descend at shallow body angles in a subsequent dive. A shallow body angle can increase the horizontal distance covered during a dive, contributing to the move into a more profitable area in the following dive. During the ascent, in particular, macaroni penguins ... Article in Journal/Newspaper Eudyptes chrysolophus Kerguelen Islands Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Kerguelen Kerguelen Islands Indian Journal of Experimental Biology 207 23 4057 4065 |
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 |
penguin data logger acceleration dive horizontal transit gliding stroke buoyancy Eudyptes chrysolophus [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society |
spellingShingle |
penguin data logger acceleration dive horizontal transit gliding stroke buoyancy Eudyptes chrysolophus [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society Sato, Katsufumi Charrassin, Jean-Benoît Bost, Charles-André Naito, Yasuhiko Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations? |
topic_facet |
penguin data logger acceleration dive horizontal transit gliding stroke buoyancy Eudyptes chrysolophus [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society |
description |
9 pages International audience It is generally assumed that air-breathing aquatic animals always choose the shortest route to minimize duration for transit between the surface and foraging depth in order to maximize the proportion of time spent foraging. However, empirical data indicate that the body angles of some diving animals are rarely vertical during descent and ascent. Why do they choose shallower body angles that result in longer descent and ascent durations? To investigate this question, we attached acceleration data loggers to eight female macaroni penguins, breeding on the Kerguelen Islands (48°45¢–50°00¢ S, 68°45¢–70°58¢ E; South Indian Ocean), to record depth, two-dimensional acceleration (stroke cycle frequency and body angle) and temperature. We investigated how they controlled body angle and allocated their submerged time. The instrumented females performed multiple dives (N=6952) with a mean dive depth for each bird ranging from 24.5±28.5·m to 56.4±75.1·m. Mean body angles during descent and ascent were not vertical. There was large variation in mean descent and ascent angles for a given dive depth, which, in turn, caused large variation in descent and ascent duration. Body angles were significantly correlated with time spent at the bottomphase of the dive. Birds that spent long periods at the bottom exhibited steep body angles during ascent and subsequent descent. By contrast, they adopted shallow body angles after they had short or no bottom phases. Our results suggest that macaroni penguins stay at the bottom longer after encountering a good prey patch and then travel to the surface at steep body angles. If they do not encounter prey, they discontinue the dive, without staying at the bottom, ascend at shallow body angles and descend at shallow body angles in a subsequent dive. A shallow body angle can increase the horizontal distance covered during a dive, contributing to the move into a more profitable area in the following dive. During the ascent, in particular, macaroni penguins ... |
author2 |
National Institute of Polar Research Tokyo (NiPR) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Sato, Katsufumi Charrassin, Jean-Benoît Bost, Charles-André Naito, Yasuhiko |
author_facet |
Sato, Katsufumi Charrassin, Jean-Benoît Bost, Charles-André Naito, Yasuhiko |
author_sort |
Sato, Katsufumi |
title |
Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations? |
title_short |
Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations? |
title_full |
Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations? |
title_fullStr |
Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations? |
title_full_unstemmed |
Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations? |
title_sort |
why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations? |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.archives-ouvertes.fr/hal-00187100 https://doi.org/10.1242/jeb.01265 |
geographic |
Kerguelen Kerguelen Islands Indian |
geographic_facet |
Kerguelen Kerguelen Islands Indian |
genre |
Eudyptes chrysolophus Kerguelen Islands |
genre_facet |
Eudyptes chrysolophus Kerguelen Islands |
op_source |
ISSN: 0022-0949 EISSN: 1477-9145 Journal of Experimental Biology https://hal.archives-ouvertes.fr/hal-00187100 Journal of Experimental Biology, The Company of Biologists, 2004, 207, pp.4057-4065. ⟨10.1242/jeb.01265⟩ http://jeb.biologists.org/content/207/23/4057 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1242/jeb.01265 hal-00187100 https://hal.archives-ouvertes.fr/hal-00187100 doi:10.1242/jeb.01265 |
op_doi |
https://doi.org/10.1242/jeb.01265 |
container_title |
Journal of Experimental Biology |
container_volume |
207 |
container_issue |
23 |
container_start_page |
4057 |
op_container_end_page |
4065 |
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1766404440965775360 |