Brief communication: Why sleep in a nest? empirical testing of the function of simple shelters made by wild chimpanzees

All great apes build nightly a structure (“nest” or “bed”) that is assumed to function primarily as a sleeping‐platform. However, several other nest function hypotheses have been proposed: antipredation, antipathogen, and thermoregulation. I tested these simple shelter functions of chimpanzee nests...

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Bibliographic Details
Published in:American journal of physical anthropology 2011-10, Vol.146 (2), p.313-318
Main Author: Stewart, F.A.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
bed
Biological and medical sciences
Body Temperature Regulation
evolution of shelter
Fundamental and applied biological sciences. Psychology
Humans
Insect Bites and Stings
Mammalia
Models, Biological
Nesting Behavior - physiology
Pan troglodytes - physiology
Research Design
savanna chimpanzees
Senegal
sleep
Sleep - physiology
Trees
Vertebrata
Vocalization, Animal
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Summary:All great apes build nightly a structure (“nest” or “bed”) that is assumed to function primarily as a sleeping‐platform. However, several other nest function hypotheses have been proposed: antipredation, antipathogen, and thermoregulation. I tested these simple shelter functions of chimpanzee nests in an experiment for which I was the subject in Fongoli, Senegal. I slept 11 nights in chimpanzee nests and on the bare ground to test for differences in sleep quality, potential exposure to disease through bites from possible vectors, and insulation. No difference was found in the total amount of sleep nor in sleep quality; however, sleep was more disturbed on the ground. Differences in sleep disturbance between arboreal and ground conditions seemed primarily due to causes of anxiety and alertness, e.g., vocalizations of terrestrial mammals. Arboreal nest‐sleeping seems to reduce risk of bites from possible disease vectors and provide insulation in cold conditions. This preliminary, but direct, test of chimpanzee nest function has implications for the evolutionary transition from limb‐roosting to nest‐reclining sleep in the hominoids, and from tree‐to‐ground sleep in the genus Homo. Am J Phys Anthropol, 2011. © 2011 Wiley‐Liss, Inc.
ISSN:0002-9483
1096-8644
DOI:10.1002/ajpa.21580