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The Malagarasi River Does Not Form an Absolute Barrier to Chimpanzee Movement in Western Tanzania

Piel, AK and Stewart, FA and Pintea, L and Li, Y and Ramirez, MA and Loy, DE and Crystal, PA and Learn, GH and Knapp, LA and Sharp, PM and Hahn, BH (2013) The Malagarasi River Does Not Form an Absolute Barrier to Chimpanzee Movement in Western Tanzania. PLOS ONE, 8 (3). ISSN 1932-6203

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The Malagarasi River has long been thought to be a barrier to chimpanzee movements in western Tanzania. This potential geographic boundary could affect chimpanzee ranging behavior, population connectivity and pathogen transmission, and thus has implications for conservation strategies and government policy. Indeed, based on mitochondrial DNA sequence comparisons it was recently argued that chimpanzees from communities to the north and to the south of the Malagarasi are surprisingly distantly related, suggesting that the river prevents gene flow. To investigate this, we conducted a survey along the Malagarasi River. We found a ford comprised of rocks that researchers could cross on foot. On a trail leading to this ford, we collected 13 fresh fecal samples containing chimpanzee DNA, two of which tested positive for SIVcpz. We also found chimpanzee feces within the riverbed. Taken together, this evidence suggests that the Malagarasi River is not an absolute barrier to chimpanzee movements and communities from the areas to the north and south should be considered a single population. These results have important consequences for our understanding of gene flow, disease dynamics and conservation management.

Item Type: Article
Uncontrolled Keywords: MD Multidisciplinary
Subjects: Q Science > QL Zoology
Divisions: Natural Sciences and Psychology
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Date Deposited: 18 Jan 2016 13:00
Last Modified: 18 Jan 2016 13:00
DOI or Identification number: 10.1371/journal.pone.0058965
URI: http://researchonline.ljmu.ac.uk/id/eprint/2653

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