Analysis of DNA sequence variation within marine species using Beta-coalescents. (English) Zbl 1296.92191
Summary: We apply recently developed inference methods based on general coalescent processes to DNA sequence data obtained from various marine species. Several of these species are believed to exhibit so-called shallow gene genealogies, potentially due to extreme reproductive behaviour, e.g. via Hedgecock’s “reproduction sweepstakes”. Besides the data analysis, in particular the inference of mutation rates and the estimation of the (real) time to the most recent common ancestor, we briefly address the question whether the genealogies might be adequately described by so-called Beta-coalescents (as opposed to Kingman’s coalescent), allowing multiple mergers of genealogies.The choice of the underlying coalescent model for the genealogy has drastic implications for the estimation of the above quantities, in particular the real-time embedding of the genealogy.
Keywords:
Beta-coalescents; inference of mutation rates; time to the most recent common ancestor; Hedgecock sweepstakes; population geneticsSoftware:
MathematicaReferences:
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