The geographic apportionment of mitochondrial genetic diversity in east African chimpanzees, Pan troglodytes schweinfurthii |
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Authors: | Goldberg TL; Ruvolo M |
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Institution: | Harvard University, Department of Anthropology, USA. tlgoldbe@uiuc.edu |
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Abstract: | This study is a geographically systematic genetic survey of the easternmost
subspecies of chimpanzee, Pan troglodytes schweinfurthii. DNA was
noninvasively collected in the form of shed hair from chimpanzees of known
origin in Uganda, Rwanda, Tanzania, and Zaire. Two hundred sixty-two DNA
sequences from hypervariable region 1 of which of the mitochondrial control
region were generated. Eastern chimpanzees display levels of mitochondrial
genetic variation which are low and which are similar to levels observed in
humans (Homo sapiens). Also like humans, between 80% and 90% of the genetic
variability within the eastern chimpanzees is apportioned within
populations. Spatial autocorrelation analysis shows that genetic similarity
between eastern chimpanzees decreases clinically with distance, in a
pattern remarkably similar to one seen for humans separated by equivalent
geographic distances. Eastern chimpanzee mismatch distributions (frequency
distributions of pairwise genetic differences between individuals) are
similar in shape to those for humans, implying similar population histories
of recent demographic expansion. The overall pattern of genetic variability
in eastern chimpanzees is consistent with the hypothesis that the subject
has responded demographically to paleoclimatically driven changes in the
distribution of eastern African forests during the recent Pleistocene.
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