Scale-dependent hierarchical adjustments of movement patterns in a long-range foraging seabird
International audience Foraging animals are expected to adjust their path according to the hierarchical spatial distribution of food resources and environmental factors. Studying such behaviour requires methods that allow for the detection of changes in pathways' characteristics across scales,...
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ftunivnantes:oai:HAL:hal-00189605v1 2023-05-15T16:00:56+02:00 Scale-dependent hierarchical adjustments of movement patterns in a long-range foraging seabird Fritz, Hervé Saïd, Sonia Weimerskirch, Henri Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) 2003 https://hal.science/hal-00189605 en eng HAL CCSD Royal Society, The hal-00189605 https://hal.science/hal-00189605 ISSN: 0962-8452 EISSN: 1471-2954 Proceedings of the Royal Society B: Biological Sciences https://hal.science/hal-00189605 Proceedings of the Royal Society B: Biological Sciences, 2003, 270, pp.1143-1148 search behaviour albatross fractals foraging paths Indian Ocean [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society info:eu-repo/semantics/article Journal articles 2003 ftunivnantes 2023-02-08T08:18:49Z International audience Foraging animals are expected to adjust their path according to the hierarchical spatial distribution of food resources and environmental factors. Studying such behaviour requires methods that allow for the detection of changes in pathways' characteristics across scales, i.e. a definition of scale boundaries and techniques to continuously monitor the precise movement of the animal over a sufficiently long period. We used a recently developed application of fractals, the changes in fractal dimension within a path and applied it to foraging trips over scales ranging across five orders of magnitude (10 m to 1000 km), using locations of wandering albatrosses (Diomedea exulans) recorded at 1 s intervals with a miniaturized global positioning system. Remarkably, all animals consistently showed the same pattern: the use of three scaledependent nested domains where they adjust tortuosity to different environmental and behavioural constraints. At a small scale (ca. 100 m) they use a zigzag movement as they continuously adjust for optimal use of wind; at a medium scale (1–10 km), the movement shows changes in tortuosity consistent with food-searching behaviour; and at a large scale (greater than 10 km) the movement corresponds to commuting between patches and is probably influenced by large-scale weather systems. Our results demonstrate the possibility of identifying the hierarchical spatial scales at which long-ranging animals adjust their foraging behaviour, even in featureless environments such as oceans, and hence how to relate their movement patterns to environmental factors using an objective mathematical approach. Article in Journal/Newspaper Diomedea exulans Université de Nantes: HAL-UNIV-NANTES Indian |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
search behaviour albatross fractals foraging paths Indian Ocean [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society |
spellingShingle |
search behaviour albatross fractals foraging paths Indian Ocean [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society Fritz, Hervé Saïd, Sonia Weimerskirch, Henri Scale-dependent hierarchical adjustments of movement patterns in a long-range foraging seabird |
topic_facet |
search behaviour albatross fractals foraging paths Indian Ocean [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society |
description |
International audience Foraging animals are expected to adjust their path according to the hierarchical spatial distribution of food resources and environmental factors. Studying such behaviour requires methods that allow for the detection of changes in pathways' characteristics across scales, i.e. a definition of scale boundaries and techniques to continuously monitor the precise movement of the animal over a sufficiently long period. We used a recently developed application of fractals, the changes in fractal dimension within a path and applied it to foraging trips over scales ranging across five orders of magnitude (10 m to 1000 km), using locations of wandering albatrosses (Diomedea exulans) recorded at 1 s intervals with a miniaturized global positioning system. Remarkably, all animals consistently showed the same pattern: the use of three scaledependent nested domains where they adjust tortuosity to different environmental and behavioural constraints. At a small scale (ca. 100 m) they use a zigzag movement as they continuously adjust for optimal use of wind; at a medium scale (1–10 km), the movement shows changes in tortuosity consistent with food-searching behaviour; and at a large scale (greater than 10 km) the movement corresponds to commuting between patches and is probably influenced by large-scale weather systems. Our results demonstrate the possibility of identifying the hierarchical spatial scales at which long-ranging animals adjust their foraging behaviour, even in featureless environments such as oceans, and hence how to relate their movement patterns to environmental factors using an objective mathematical approach. |
author2 |
Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Fritz, Hervé Saïd, Sonia Weimerskirch, Henri |
author_facet |
Fritz, Hervé Saïd, Sonia Weimerskirch, Henri |
author_sort |
Fritz, Hervé |
title |
Scale-dependent hierarchical adjustments of movement patterns in a long-range foraging seabird |
title_short |
Scale-dependent hierarchical adjustments of movement patterns in a long-range foraging seabird |
title_full |
Scale-dependent hierarchical adjustments of movement patterns in a long-range foraging seabird |
title_fullStr |
Scale-dependent hierarchical adjustments of movement patterns in a long-range foraging seabird |
title_full_unstemmed |
Scale-dependent hierarchical adjustments of movement patterns in a long-range foraging seabird |
title_sort |
scale-dependent hierarchical adjustments of movement patterns in a long-range foraging seabird |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00189605 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Diomedea exulans |
genre_facet |
Diomedea exulans |
op_source |
ISSN: 0962-8452 EISSN: 1471-2954 Proceedings of the Royal Society B: Biological Sciences https://hal.science/hal-00189605 Proceedings of the Royal Society B: Biological Sciences, 2003, 270, pp.1143-1148 |
op_relation |
hal-00189605 https://hal.science/hal-00189605 |
_version_ |
1766396950793420800 |