Foraging Behaviour in Magellanic Woodpeckers Is Consistent with a Multi-Scale Assessment of Tree Quality
Author
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Vergara, Pablo
Author
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Soto, Gerardo
Author
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Moreira Arce, Darío
Author
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Rodewald, Amanda
Author
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Meneses, Luis
Author
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Pérez Hernández, Christian
Admission date
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2016-12-05T21:25:44Z
Available date
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2016-12-05T21:25:44Z
Publication date
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2016
Cita de ítem
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Plos One July 14, 2016
es_ES
Identifier
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10.1371/journal.pone.0159096
Identifier
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https://repositorio.uchile.cl/handle/2250/141674
Abstract
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Theoretical models predict that animals should make foraging decisions after assessing the quality of available habitat, but most models fail to consider the spatio-temporal scales at which animals perceive habitat availability. We tested three foraging strategies that explain how Magellanic woodpeckers (Campephilus magellanicus) assess the relative quality of trees: 1) Woodpeckers with local knowledge select trees based on the available trees in the immediate vicinity. 2) Woodpeckers lacking local knowledge select trees based on their availability at previously visited locations. 3) Woodpeckers using information from long-term memory select trees based on knowledge about trees available within the entire landscape. We observed foraging woodpeckers and used a Brownian Bridge Movement Model to identify trees available to woodpeckers along foraging routes. Woodpeckers selected trees with a later decay stage than available trees. Selection models indicated that preferences of Magellanic woodpeckers were based on clusters of trees near the most recently visited trees, thus suggesting that woodpeckers use visual cues from neighboring trees. In a second analysis, Cox's proportional hazards models showed that woodpeckers used information consolidated across broader spatial scales to adjust tree residence times. Specifically, woodpeckers spent more time at trees with larger diameters and in a more advanced stage of decay than trees available along their routes. These results suggest that Magellanic woodpeckers make foraging decisions based on the relative quality of trees that they perceive and memorize information at different spatio-temporal scales
es_ES
Patrocinador
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FONDECYT (Comision Nacional de Investigacion Cientifica y Tecnologica) 1131133
FONDECYT 1131133