Jackie Chappell, - and Abigail C. Phillips, - and Maria A. van Noordwijk, - and Tatang Mitra Setia, - and Susannah K.S. Thorpe, - (2015) The Ontogeny of Gap Crossing Behaviourin Bornean Orangutans(Pongopygmaeus wurmbii). PLOS ONE.
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Abstract
Fororangutans,thelargest predominantly arboreal primates, discontinuous can opypresents a particular challenge.The shortest gaps between trees lie between thin peripheral branches,which offer the least stability to large animals.The affordancesof the forest canopy experienced by orangutan sofdifferentages however, must vary substantially as adult male sareanorder of magnitude larger insize than infants during the early stages of locomotor independence.Orangutans have developed a diverserange oflocomotor behaviour tocrossgapsbetweentrees,which vary in their physical and cognitivedemands.The aims of this study were to examine the ontogeny of orangutan gap crossing behaviour sand to determine which factors influence the distance orangutans crossed.Anon-invasive photographic technique was used to quantify for earm length a samea sure of body size.We also recorded locomotor behaviour,support use and the distance crossed between trees.Our results suggest that gap crossing varies with both physical and cognitive development. More complex locomotor behaviours, which utilized compliant trunks and lianas,wereused tocrossthelargestgaps,but the sepeaked in frequency much earlier than expected, between the ages of 4 and 5 years old,which probably reflects play behaviour to perfect locomotor techniques. Smaller individual salsocrosseddisproportionately large gap srelative to their size,by using support deformation. Our results suggest that orangutans acquire the full repertoire of gap crossing techniques, including the more cognitively demanding ones,before weaning, but adjust the frequency of the use of these techniques to their increasing body size.
| Item Type: | Article |
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| Subjects: | Q Science > Q Science (General) |
| Divisions: | Artikel > Biologi |
| Depositing User: | BPSI Unas |
| Date Deposited: | 20 Aug 2017 01:08 |
| Last Modified: | 20 Aug 2017 01:08 |
| URI: | http://repository.unas.ac.id/id/eprint/54 |
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