Lair, Helene; Kramer, Donald L. et Giraldeau, Luc-Alain (1994). Interference competition in central place foragers: the effect of imposed waiting on patch-use decisions of eastern chipmunks, Tamias striatus. Behavioral Ecology , vol. 5 , nº 3. pp. 237-244. DOI: 10.1093/beheco/5.3.237.
Ce document n'est pas hébergé sur EspaceINRS.Résumé
When central place foragers compete aggressively for patchy resources, subordinates may be preventedfrom collecting food until a dominant has departed with its load. Extensions of central place foraging models predict that animals forced to wait at a patch should increase their load sizes and patch times aswell as their tendency to search for and switch to alternative patches. We tested these predictions usingeastern chipmunks, Tamias striatus, hoarding sunflower seeds collected from seed/vermiculite mixturesin trays placed 5-8 m from their burrows. By using her hand to prevent access to the patch, the experimentersubjected animals to progressively increasing waiting times at two seed densities; another series of trialsat the same seed densities monitored a similar number of trips without imposed waiting. As predicted, patch times and load sizes were higher in sessions with imposed waiting than in control sessions. Loadsizes increased with trial number in experimental sessions but decreased or remained the same in controlsessions. Chipmunks spent more of their time searching for alternative patches during trials with imposed waiting than during controls. They also started searching for alternative patches at lower levels of imposed waiting when using poor than when using rich patches. These results indicate that the effects of interference on foraging decisions and on spatial overlap between individuals can be predicted by simple economic models. Furthermore, the results suggest how resource-defense tactics can be predicted by the economic effects of interference on the foraging efficiency of the opponent.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | central place foraging; chipmunk; competition; environmental tracking; hoarding; interference; load size; optimal foraging; patch choice; resource defense; Tamias Sciuridae |
| Centre: | Institut national de la recherche scientifique |
| Date de dépôt: | 02 mai 2018 15:33 |
| Dernière modification: | 11 mai 2018 13:15 |
| URI: | https://espace.inrs.ca/id/eprint/7049 |
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