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Article Dans Une Revue Ecological Modelling Année : 2014

Movement models provide insights into variation in the foragingeffort of central place foragers

Résumé

tEcology and conservation depend on an understanding of how animals adjust their behaviour patternsin response to changes in their environment. Central place foragers (CPFs) are well-suited for developingecological models of adaptive processes because their objective functions and operational constraintscan be reasonably inferred. Central place foraging and provisioning theory provide the theoretical frame-work for this analysis. Analysis of CPF time allocation and energy budgets can provide insights into theirstrategies for responding to environmental variation. However, until recently, suitable high-resolutiondata on the behaviour of seabirds and other CPFs at sea have not been available. Previous studies ofbreeding seabirds have investigated variation in foraging trip duration and colony attendance, but fewstudies have analyzed variation in time allocation within foraging trips. Here, we develop a concep-tual energy-based model for analysing variation in the time allocation of CPFs during foraging trips, andapply it to the movement patterns of Peruvian boobies (Sula variegata). Foraging trips of Peruvian boobies,recorded using high-resolution global positioning systems (GPS), were first partitioned into movementmodes consistent with travel and foraging behaviours using a hidden Markov model (HMM) adapted toaccount for gaps in the GPS tracks associated with diving behaviour. Analysis of the HMM results basedon the conceptual model indicated that differences in foraging effort between two treatments were bestexplained by a combination of differences in travel time and in time spent searching for prey. The con-ceptual model provides the basis for an integrated approach to analysis of variation in foraging strategiesin which identification of various behaviours is coupled with assessments of time and energy budgets.This integrated approach can contribute to greater understanding of the processes determining foragingstrategies and the limits to these strategies in the context of competition for resources and global climatechange.
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Dates et versions

hal-01005632 , version 1 (13-06-2014)

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Charlotte Boyd, André E. Punt, Henri Weimerskirch, Sophie Bertrand. Movement models provide insights into variation in the foragingeffort of central place foragers. Ecological Modelling, 2014, 286, pp.13-25. ⟨10.1016/j.ecolmodel.2014.03.015⟩. ⟨hal-01005632⟩
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