Document Detail

Genetic evidence for long-term population decline in a savannah-dwelling primate: inferences from a hierarchical bayesian model.
MedLine Citation:
PMID:  12411607     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to test for evidence that savannah baboons (Papio cynocephalus) underwent a population expansion in concert with a hypothesized expansion of African human and chimpanzee populations during the late Pleistocene. The rationale is that any type of environmental event sufficient to cause simultaneous population expansions in African humans and chimpanzees would also be expected to affect other codistributed mammals. To test for genetic evidence of population expansion or contraction, we performed a coalescent analysis of multilocus microsatellite data using a hierarchical Bayesian model. Markov chain Monte Carlo (MCMC) simulations were used to estimate the posterior probability density of demographic and genealogical parameters. The model was designed to allow interlocus variation in mutational and demographic parameters, which made it possible to detect aberrant patterns of variation at individual loci that could result from heterogeneity in mutational dynamics or from the effects of selection at linked sites. Results of the MCMC simulations were consistent with zero variance in demographic parameters among loci, but there was evidence for a 10- to 20-fold difference in mutation rate between the most slowly and most rapidly evolving loci. Results of the model provided strong evidence that savannah baboons have undergone a long-term historical decline in population size. The mode of the highest posterior density for the joint distribution of current and ancestral population size indicated a roughly eightfold contraction over the past 1,000 to 250,000 years. These results indicate that savannah baboons apparently did not share a common demographic history with other codistributed primate species.
Jay F Storz; Mark A Beaumont; Susan C Alberts
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Molecular biology and evolution     Volume:  19     ISSN:  0737-4038     ISO Abbreviation:  Mol. Biol. Evol.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-04     Completed Date:  2003-10-20     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8501455     Medline TA:  Mol Biol Evol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1981-90     Citation Subset:  IM    
Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, 85721, USA.
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MeSH Terms
Bayes Theorem
Evolution, Molecular*
Genetic Variation / genetics
Markov Chains
Models, Biological
Monte Carlo Method
Mutagenesis / genetics
Papio / genetics*,  physiology*
Population Density
Selection, Genetic
Time Factors
Grant Support

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