Coupling instantaneous energy-budget models and behavioural mode analysis to estimate optimal foraging strategy: an example with wandering albatrosses
International audience Background: How foragers move across the landscape to search for resources and obtain energy is a central issue in ecology. Direct energetic quantification of animal movements allows for testing optimal foraging theory predictions which assumes that animals forage so as to max...
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Online Access: | https://hal.archives-ouvertes.fr/hal-00958698 https://doi.org/10.1186/2051-3933-2-8 |
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ftccsdartic:oai:HAL:hal-00958698v1 2023-05-15T16:00:58+02:00 Coupling instantaneous energy-budget models and behavioural mode analysis to estimate optimal foraging strategy: an example with wandering albatrosses Louzao, Maite Wiegand, Thorsten Bartumeus, Frederic Weimerskirch, Henri Helmholtz Zentrum für Umweltforschung = Helmholtz Centre for Environmental Research (UFZ) Instituto Espanol de Oceanografia Instituto Español de Oceanografía Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) ICREA-Movement Ecology Laboratory (CEAB-CSIC) CREAF 2014 https://hal.archives-ouvertes.fr/hal-00958698 https://doi.org/10.1186/2051-3933-2-8 en eng HAL CCSD BioMed Central info:eu-repo/semantics/altIdentifier/doi/10.1186/2051-3933-2-8 hal-00958698 https://hal.archives-ouvertes.fr/hal-00958698 doi:10.1186/2051-3933-2-8 EISSN: 2051-3933 Movement Ecology https://hal.archives-ouvertes.fr/hal-00958698 Movement Ecology, BioMed Central, 2014, 2, pp.8. ⟨10.1186/2051-3933-2-8⟩ Oceanic predator Oceanic winds Energy-budget model Behavioural clustering Optimal foraging theory [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2014 ftccsdartic https://doi.org/10.1186/2051-3933-2-8 2021-12-05T03:23:27Z International audience Background: How foragers move across the landscape to search for resources and obtain energy is a central issue in ecology. Direct energetic quantification of animal movements allows for testing optimal foraging theory predictions which assumes that animals forage so as to maximise net energy gain. Thanks to biologging advances, we coupled instantaneous energy-budget models and behavioural mode analysis to test optimal foraging theory predictions on wandering albatross Diomedea exulans during the brooding period. Specifically, the instantaneous energy-budget model considered the energetic balance (i.e., the difference between empirical energy gain data and modelled energy expenditure via heart rate values) along the trajectory of a given individual. Four stereotypic instantaneous behavioural modes were identified based on trajectory properties (e.g., speed and turning angle) by applying a new algorithm called Expectation Maximization Binary Clustering. Previous studies on this species have shown that foraging-in-flight is the optimal foraging strategy during the incubation period when albatrosses undertake long-distance movements but no specific foraging strategy has been determined for shorter foraging movements (e.g., brooding period). Results: The output of our energy-budget model (measured as net energy gain) highlighted the potential optimality of alternative search strategies (e.g., sit-and-wait) during brooding, when birds may be subjected to specific energetic trade-offs and have to adapt their foraging strategies accordingly. However, not all birds showed this pattern, revealing the importance of considering individual variability in foraging strategies, as well as any switching among strategies, before drawing population-level generalizations. Finally, our study unveils the importance of considering fine scale activities to make realistic estimates of trip energy expenditure for flying birds at sea. Conclusions: The up-scaling of accurately measured fine-scale energy patterns ... Article in Journal/Newspaper Diomedea exulans Wandering Albatross Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Movement Ecology 2 1 |
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 |
Oceanic predator Oceanic winds Energy-budget model Behavioural clustering Optimal foraging theory [SDE]Environmental Sciences |
spellingShingle |
Oceanic predator Oceanic winds Energy-budget model Behavioural clustering Optimal foraging theory [SDE]Environmental Sciences Louzao, Maite Wiegand, Thorsten Bartumeus, Frederic Weimerskirch, Henri Coupling instantaneous energy-budget models and behavioural mode analysis to estimate optimal foraging strategy: an example with wandering albatrosses |
topic_facet |
Oceanic predator Oceanic winds Energy-budget model Behavioural clustering Optimal foraging theory [SDE]Environmental Sciences |
description |
International audience Background: How foragers move across the landscape to search for resources and obtain energy is a central issue in ecology. Direct energetic quantification of animal movements allows for testing optimal foraging theory predictions which assumes that animals forage so as to maximise net energy gain. Thanks to biologging advances, we coupled instantaneous energy-budget models and behavioural mode analysis to test optimal foraging theory predictions on wandering albatross Diomedea exulans during the brooding period. Specifically, the instantaneous energy-budget model considered the energetic balance (i.e., the difference between empirical energy gain data and modelled energy expenditure via heart rate values) along the trajectory of a given individual. Four stereotypic instantaneous behavioural modes were identified based on trajectory properties (e.g., speed and turning angle) by applying a new algorithm called Expectation Maximization Binary Clustering. Previous studies on this species have shown that foraging-in-flight is the optimal foraging strategy during the incubation period when albatrosses undertake long-distance movements but no specific foraging strategy has been determined for shorter foraging movements (e.g., brooding period). Results: The output of our energy-budget model (measured as net energy gain) highlighted the potential optimality of alternative search strategies (e.g., sit-and-wait) during brooding, when birds may be subjected to specific energetic trade-offs and have to adapt their foraging strategies accordingly. However, not all birds showed this pattern, revealing the importance of considering individual variability in foraging strategies, as well as any switching among strategies, before drawing population-level generalizations. Finally, our study unveils the importance of considering fine scale activities to make realistic estimates of trip energy expenditure for flying birds at sea. Conclusions: The up-scaling of accurately measured fine-scale energy patterns ... |
author2 |
Helmholtz Zentrum für Umweltforschung = Helmholtz Centre for Environmental Research (UFZ) Instituto Espanol de Oceanografia Instituto Español de Oceanografía Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) ICREA-Movement Ecology Laboratory (CEAB-CSIC) CREAF |
format |
Article in Journal/Newspaper |
author |
Louzao, Maite Wiegand, Thorsten Bartumeus, Frederic Weimerskirch, Henri |
author_facet |
Louzao, Maite Wiegand, Thorsten Bartumeus, Frederic Weimerskirch, Henri |
author_sort |
Louzao, Maite |
title |
Coupling instantaneous energy-budget models and behavioural mode analysis to estimate optimal foraging strategy: an example with wandering albatrosses |
title_short |
Coupling instantaneous energy-budget models and behavioural mode analysis to estimate optimal foraging strategy: an example with wandering albatrosses |
title_full |
Coupling instantaneous energy-budget models and behavioural mode analysis to estimate optimal foraging strategy: an example with wandering albatrosses |
title_fullStr |
Coupling instantaneous energy-budget models and behavioural mode analysis to estimate optimal foraging strategy: an example with wandering albatrosses |
title_full_unstemmed |
Coupling instantaneous energy-budget models and behavioural mode analysis to estimate optimal foraging strategy: an example with wandering albatrosses |
title_sort |
coupling instantaneous energy-budget models and behavioural mode analysis to estimate optimal foraging strategy: an example with wandering albatrosses |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.archives-ouvertes.fr/hal-00958698 https://doi.org/10.1186/2051-3933-2-8 |
genre |
Diomedea exulans Wandering Albatross |
genre_facet |
Diomedea exulans Wandering Albatross |
op_source |
EISSN: 2051-3933 Movement Ecology https://hal.archives-ouvertes.fr/hal-00958698 Movement Ecology, BioMed Central, 2014, 2, pp.8. ⟨10.1186/2051-3933-2-8⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1186/2051-3933-2-8 hal-00958698 https://hal.archives-ouvertes.fr/hal-00958698 doi:10.1186/2051-3933-2-8 |
op_doi |
https://doi.org/10.1186/2051-3933-2-8 |
container_title |
Movement Ecology |
container_volume |
2 |
container_issue |
1 |
_version_ |
1766396969039691776 |