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Ecological, social, and reproductive factors shape producer–scrounger dynamics in baboons

King, Andrew J.; Isaac, Nick J.B.; Cowlishaw, Guy. 2009 Ecological, social, and reproductive factors shape producer–scrounger dynamics in baboons. Behavioral Ecology, 20 (5). 1039-1049. 10.1093/beheco/arp095

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Abstract/Summary

Producer–scrounger models are used to explain the tactics of socially foraging animals where individuals can either search fortheir food (produce) or join the food discoveries of others (scrounge). However, the empirical testing of such models hasgenerally been restricted to indoor aviary experiments. Here, we examine the social foraging tactics of naturally foraging wild chacma baboons (Papio ursinus). Thirty-six adult baboons from 2 groups were observed during full-day follows: Data from nearly10 000 foraging events were analyzed using cross-classified, generalized linear mixed models. First, as predicted by producer–scrounger models, we show that baboons altered their foraging tactics in accordance with food patch size and spatial position in the group. Second, we show that the relative characteristics of cofeeding individuals were crucial: In particular, among females, individuals were more likely to scrounge from foraging neighbors who were subordinate and with whom they had a strong social affiliation. However, we found no effect of kinship. Finally, we found that female reproductive state influenced female foraging tactics (females scrounged more from male neighbors when pregnant and less when fertile), but the reproductive state of female neighbors had no such effects on male foraging tactics. These results suggest that, in addition to broad-scale ecological and group-level influences, a myriad of social and reproductive factors can shape producer–scrounger dynamics for wild animals living in complex social groups.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1093/beheco/arp095
Programmes: CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 1 - Observations, Patterns, and Predictions for Biodiversity
CEH Sections: Pywell
ISSN: 1045-2249
Additional Keywords: chacma baboon, dyadic interactions, Papio ursinus, producer, scrounger, social foraging
NORA Subject Terms: Zoology
Ecology and Environment
Related URLs:
Date made live: 09 Nov 2009 15:13
URI: http://nora.nerc.ac.uk/id/eprint/8160

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