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Abstracts of Presentations of the Twenty-Third Annual Meeting of The American Society of Primatologists

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 130 KB
Volume: 51
Category: Article
ISSN: 0275-2565
DOI: 10.1002/(sici)1098-2345(2000)51:1+<75::aid-ajp6>3.0.co;2-x

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✦ Synopsis

Most studies of prosimian lateral preference have focused on simple food reaching on a terrestrial substrate. These studies report a left-hand preference for reaching for food and a right hand preference for postural support. In arboreal habitats, the added vertical dimension presents postural challenges that could have promoted manual specialization for postural stability. Sifakas are arboreal folivores that locomote using vertical clinging and leaping. They display a wide range of postures as they feed and are ideal subjects for testing whether manual specializations for postural support drive lateral reach preferences observed in feeding behavior. To test this assertion, fifteen sifakas (ten Propithecus verreauxi coquereli; three Propithecus tattersalli, and two Propithecus verreauxi verreauxi form "majori") were videotaped as they fed on leaves in an arboreal context. The hand used to feed and the hand used to maintain postural stability were coded. For each subject, the lateral bias of the hand used to reach was opposite the hand used in postural support. Six sifakas displayed significant reach preferences for pulling branches to the mouth (5 left and 1 right hand preferent), and eight sifakas exhibited significant hand preferences for postural support (1 left, 7 right hand preferent). It is concluded that postural support preferences do in fact have a role in shaping subsequent reach biases, even in a context as complex as the arboreal milieu.

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