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ancient dna assessment of tiger salamander population in yellowstone national park古dna的评估老虎蝾螈人口在黄石国家公园
Ancient DNA Assessment of Tiger Salamander
Population in Yellowstone National Park
¤
Sarah K. McMenamin* , Elizabeth A. Hadly
Department of Biology, Stanford University, Stanford, California, United States of America
Abstract
Recent data indicates that blotched tiger salamanders (Ambystoma tigrinum melanostictum) in northern regions of
Yellowstone National Park are declining due to climate-related habitat changes. In this study, we used ancient and modern
mitochondrial haplotype diversity to model the effective size of this amphibian population through recent geological time
and to assess past responses to climatic changes in the region. Using subfossils collected from a cave in northern
Yellowstone, we analyzed .700 base pairs of mitochondrial sequence from 16 samples ranging in age from 100 to 3300
years old and found that all shared an identical haplotype. Although mitochondrial diversity was extremely low within the
living population, we still were able to detect geographic subdivision within the local area. Using serial coalescent
modelling with Bayesian priors from both modern and ancient genetic data we simulated a range of probable population
sizes and mutation rates through time. Our simulations suggest that regional mitochondrial diversity has remained relatively
constant even through climatic fluctuations of recent millennia.
Citation: McMenamin SK, Hadly EA (2012) Ancient DNA Assessment of Tiger Salamander Population in Yellowstone National Park. PLoS ONE 7(3): e32763.
doi:10.1371/journal.pone.0032763
Editor: David Nogues-Bravo, University of Copenhagen, Denmark
Received October 20, 2011; Accepted February 2, 2012; Published March 12, 2012
Copyright: 2012 McMenamin, Hadly. This is an open-access art
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