Foraging effort in relation to the constraints of reproduction in free-ranging albatrosses
International audience 1. Theoretical models predict that animals will vary their effort to maximize different currencies such as time and energy when the constraints of reproduction change during breeding, but this has been poorly studied in free-ranging animals. 2. Foraging effort (energy per unit...
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fttriple:oai:gotriple.eu:10670/1.2r1tlx 2023-05-15T16:00:57+02:00 Foraging effort in relation to the constraints of reproduction in free-ranging albatrosses Weimerskirch, Henri Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) 2003-01-01 https://hal.archives-ouvertes.fr/hal-00189783 en eng HAL CCSD Wiley hal-00189783 10670/1.2r1tlx https://hal.archives-ouvertes.fr/hal-00189783 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0269-8463 EISSN: 1365-2435 Functional Ecology Functional Ecology, Wiley, 2003, 17, pp.66-74 Energy expenditure Wandering Albatrosses envir socio Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2003 fttriple 2023-01-22T16:48:25Z International audience 1. Theoretical models predict that animals will vary their effort to maximize different currencies such as time and energy when the constraints of reproduction change during breeding, but this has been poorly studied in free-ranging animals. 2. Foraging effort (energy per unit time) was examined by comparing mass changes, foraging costs and activity-specific behaviours of Wandering Albatrosses ( Diomedea exulans Linnaeus) during the incubation and chick-brooding stages. In 1998, 38 albatrosses (20 during incubation and 18 during brooding) were injected with doubly labelled water and equipped with satellite transmitters and activity data loggers. 3. During incubation, albatrosses travelled 3·7 times farther and were at sea 3·2 times longer, yet foraging costs were significantly lower than trips made during brooding (incubation 4·52 ± 0·50 SD W kg - 1 vs brooding 4·98 ± 0·55 SD W kg - 1 ). 4. The rate of daily mass gain decreased significantly with time at sea during incubation whereas the rate of daily mass gain increased significantly with time at sea during brooding. 5. Foraging effort was higher during brooding, suggesting that birds were minimizing time at sea to maximize the rate of food delivery to chicks. In contrast, foraging effort was lower during incubation, suggesting that birds were maximizing time at sea and minimizing the energy costs of foraging. 6. Foraging costs were also different between sexes. However, this was related to body size differences and not to differences in foraging effort as suggested in previous studies. 9 pages Article in Journal/Newspaper Diomedea exulans Unknown |
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language |
English |
topic |
Energy expenditure Wandering Albatrosses envir socio |
spellingShingle |
Energy expenditure Wandering Albatrosses envir socio Weimerskirch, Henri Foraging effort in relation to the constraints of reproduction in free-ranging albatrosses |
topic_facet |
Energy expenditure Wandering Albatrosses envir socio |
description |
International audience 1. Theoretical models predict that animals will vary their effort to maximize different currencies such as time and energy when the constraints of reproduction change during breeding, but this has been poorly studied in free-ranging animals. 2. Foraging effort (energy per unit time) was examined by comparing mass changes, foraging costs and activity-specific behaviours of Wandering Albatrosses ( Diomedea exulans Linnaeus) during the incubation and chick-brooding stages. In 1998, 38 albatrosses (20 during incubation and 18 during brooding) were injected with doubly labelled water and equipped with satellite transmitters and activity data loggers. 3. During incubation, albatrosses travelled 3·7 times farther and were at sea 3·2 times longer, yet foraging costs were significantly lower than trips made during brooding (incubation 4·52 ± 0·50 SD W kg - 1 vs brooding 4·98 ± 0·55 SD W kg - 1 ). 4. The rate of daily mass gain decreased significantly with time at sea during incubation whereas the rate of daily mass gain increased significantly with time at sea during brooding. 5. Foraging effort was higher during brooding, suggesting that birds were minimizing time at sea to maximize the rate of food delivery to chicks. In contrast, foraging effort was lower during incubation, suggesting that birds were maximizing time at sea and minimizing the energy costs of foraging. 6. Foraging costs were also different between sexes. However, this was related to body size differences and not to differences in foraging effort as suggested in previous studies. 9 pages |
author2 |
Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Weimerskirch, Henri |
author_facet |
Weimerskirch, Henri |
author_sort |
Weimerskirch, Henri |
title |
Foraging effort in relation to the constraints of reproduction in free-ranging albatrosses |
title_short |
Foraging effort in relation to the constraints of reproduction in free-ranging albatrosses |
title_full |
Foraging effort in relation to the constraints of reproduction in free-ranging albatrosses |
title_fullStr |
Foraging effort in relation to the constraints of reproduction in free-ranging albatrosses |
title_full_unstemmed |
Foraging effort in relation to the constraints of reproduction in free-ranging albatrosses |
title_sort |
foraging effort in relation to the constraints of reproduction in free-ranging albatrosses |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.archives-ouvertes.fr/hal-00189783 |
genre |
Diomedea exulans |
genre_facet |
Diomedea exulans |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0269-8463 EISSN: 1365-2435 Functional Ecology Functional Ecology, Wiley, 2003, 17, pp.66-74 |
op_relation |
hal-00189783 10670/1.2r1tlx https://hal.archives-ouvertes.fr/hal-00189783 |
op_rights |
undefined |
_version_ |
1766396953156911104 |