Journal
MOLECULAR ECOLOGY
Volume 17, Issue 12, Pages 2898-2909Publisher
WILEY
DOI: 10.1111/j.1365-294X.2008.03793.x
Keywords
control region; noninvasive genetics; phylogeography; population structure; primates; riverine barrier hypothesis
Funding
- Natural Environment Research Council [NER/J/S/2002/00706] Funding Source: researchfish
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We examined mitochondrial DNA control region sequences of 73 Kinabatangan orang-utans to test the hypothesis that the phylogeographical structure of the Bornean orang-utan is influenced by riverine barriers. The Lower Kinabatangan Wildlife Sanctuary contains one of the most northern populations of orang-utans (Pongo pygmaeus) on Borneo and is bisected by the Kinabatangan River, the longest river in Sabah. Orang-utan samples on either side of the river were strongly differentiated with a high Phi(ST) value of 0.404 (P < 0.001). Results also suggest an east-west gradient of genetic diversity and evidence for population expansion along the river, possibly reflecting a postglacial colonization of the Kinabatangan floodplain. We compared our data with previously published sequences of Bornean orang-utans in the context of river catchment structure on the island and evaluated the general relevance of rivers as barriers to gene flow in this long-lived, solitary arboreal ape.
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