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Experimental evidence for route integration and strategic planning in wild capuchin monkeys

Content Provider	Springer Nature Link
Author	Janson, Charles H.
Copyright Year	2007
Abstract	Both in captivity and the wild, primates are found to travel mostly to the nearest available resource, but they may skip over the closest resource and travel to more distant resources, which are often found to be more productive. This study examines the tradeoff between distance and reward in the foraging choices of one group of wild capuchin monkeys (Cebus apella nigritus) using feeding platforms in large-scale foraging experiments conducted over four years. Three feeding sites were arrayed in an oblique triangle, such that once the monkey group had chosen one site to feed, they had a choice between two remaining sites, a close one with less food and the other up to 2.3 times as far away but with more food. Sites were provisioned once per day. The capuchins generally chose the closer feeding site, even when the more distant site offered up to 12 times as much food. The distances to, rewards of, or various profitability measures applied to each alternative site individually did not explain the group’s choices in ways consistent with foraging theory or principles of operant psychology. The group’s site choices were predicted only by comparing efficiency measures of entire foraging pathways: (1) direct travel to the more rewarding distant site, versus (2) the longer ‘detour’ through the closer site on the way to the more distant one. The group chose the detour more often when the reward was larger and the added detour distance shorter. They appeared to be more sensitive to the absolute increase in detour distance than to the relative increase compared to the straight route. The qualitative and quantitative results agree with a simple rule: do not use the detour unless the energy gain from extra food outweighs the energy cost of extra travel. These results suggest that members of this group integrate information on spatial location, reward, and perhaps potential food competition in their choice of multi-site foraging routes, with important implications for social foraging.
Starting Page	341
Ending Page	356
Page Count	16
File Format	PDF
ISSN	14359448
Journal	Animal Cognition
Volume Number	10
Issue Number	3
e-ISSN	14359456
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-04-27
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Cognitive map Capuchin Primate Food competition Ecology Self-control Human Physiology Zoology Behavioural Sciences
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Ecology, Evolution, Behavior and Systematics

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