At-sea distribution and scale-dependent foraging behaviour of petrels and albatrosses: a comparative study
International audience 1. In order to study and predict population distribution, it is crucial to identify and understand factors affecting individual movement decisions at different scales. Movements of foraging animals should be adjusted to the hierarchical spatial distribution of resources in the...
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ftunivnantes:oai:HAL:hal-00183610v1 2023-05-15T16:00:58+02:00 At-sea distribution and scale-dependent foraging behaviour of petrels and albatrosses: a comparative study Pinaud, David Weimerskirch, Henri Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) 2007-01 https://hal.science/hal-00183610 en eng HAL CCSD Wiley hal-00183610 https://hal.science/hal-00183610 ISSN: 0021-8790 EISSN: 1365-2656 Journal of Animal Ecology https://hal.science/hal-00183610 Journal of Animal Ecology, 2007, 76, pp.9-19 [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2007 ftunivnantes 2023-02-08T08:30:11Z International audience 1. In order to study and predict population distribution, it is crucial to identify and understand factors affecting individual movement decisions at different scales. Movements of foraging animals should be adjusted to the hierarchical spatial distribution of resources in the environment and this scale-dependent response to environmental heterogeneity should differ according to the forager's characteristics and exploited habitats. 2. Using First-Passage Time analysis, we studied scales of search effort and habitat used by individuals of seven sympatric Indian Ocean Procellariiform species fitted with satellite transmitters. We characterized their search effort distribution and examined whether species differ in scale-dependent adjustments of their movements according to the marine environment exploited. 3. All species and almost all individuals (91% of 122 individuals) exhibited an Area- Restricted Search (ARS) during foraging. At a regional scale (1000s km), foraging ranges showed a large spatial overlap between species. At a smaller scale (100s km, at which an increase in search effort occurred), a segregation in environmental characteristics of ARS zones (where search effort is high) was found between species. 4. Spatial scales at which individuals increased their search effort differed between species and also between exploited habitats, indicating a similar movement adjustment for predators foraging in the same habitat. ARS zones of the two populations of wandering albatross Diomedea exulans (Crozet and Kerguelen) were similar in their adjustments (i.e. same ARS scale) as well as in their environmental characteristics. These two populations showed a weak spatial overlap in their foraging distribution, with males foraging in more southerly waters than females in both populations. 5. This study demonstrates that predators of several species adjust their foraging behaviour to the heterogeneous environment and these scale-dependent movement adjustments depend on both forager and ... Article in Journal/Newspaper Diomedea exulans Wandering Albatross Université de Nantes: HAL-UNIV-NANTES Kerguelen Indian |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes Pinaud, David Weimerskirch, Henri At-sea distribution and scale-dependent foraging behaviour of petrels and albatrosses: a comparative study |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience 1. In order to study and predict population distribution, it is crucial to identify and understand factors affecting individual movement decisions at different scales. Movements of foraging animals should be adjusted to the hierarchical spatial distribution of resources in the environment and this scale-dependent response to environmental heterogeneity should differ according to the forager's characteristics and exploited habitats. 2. Using First-Passage Time analysis, we studied scales of search effort and habitat used by individuals of seven sympatric Indian Ocean Procellariiform species fitted with satellite transmitters. We characterized their search effort distribution and examined whether species differ in scale-dependent adjustments of their movements according to the marine environment exploited. 3. All species and almost all individuals (91% of 122 individuals) exhibited an Area- Restricted Search (ARS) during foraging. At a regional scale (1000s km), foraging ranges showed a large spatial overlap between species. At a smaller scale (100s km, at which an increase in search effort occurred), a segregation in environmental characteristics of ARS zones (where search effort is high) was found between species. 4. Spatial scales at which individuals increased their search effort differed between species and also between exploited habitats, indicating a similar movement adjustment for predators foraging in the same habitat. ARS zones of the two populations of wandering albatross Diomedea exulans (Crozet and Kerguelen) were similar in their adjustments (i.e. same ARS scale) as well as in their environmental characteristics. These two populations showed a weak spatial overlap in their foraging distribution, with males foraging in more southerly waters than females in both populations. 5. This study demonstrates that predators of several species adjust their foraging behaviour to the heterogeneous environment and these scale-dependent movement adjustments depend on both forager and ... |
author2 |
Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Pinaud, David Weimerskirch, Henri |
author_facet |
Pinaud, David Weimerskirch, Henri |
author_sort |
Pinaud, David |
title |
At-sea distribution and scale-dependent foraging behaviour of petrels and albatrosses: a comparative study |
title_short |
At-sea distribution and scale-dependent foraging behaviour of petrels and albatrosses: a comparative study |
title_full |
At-sea distribution and scale-dependent foraging behaviour of petrels and albatrosses: a comparative study |
title_fullStr |
At-sea distribution and scale-dependent foraging behaviour of petrels and albatrosses: a comparative study |
title_full_unstemmed |
At-sea distribution and scale-dependent foraging behaviour of petrels and albatrosses: a comparative study |
title_sort |
at-sea distribution and scale-dependent foraging behaviour of petrels and albatrosses: a comparative study |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00183610 |
geographic |
Kerguelen Indian |
geographic_facet |
Kerguelen Indian |
genre |
Diomedea exulans Wandering Albatross |
genre_facet |
Diomedea exulans Wandering Albatross |
op_source |
ISSN: 0021-8790 EISSN: 1365-2656 Journal of Animal Ecology https://hal.science/hal-00183610 Journal of Animal Ecology, 2007, 76, pp.9-19 |
op_relation |
hal-00183610 https://hal.science/hal-00183610 |
_version_ |
1766396971716706304 |