期刊
THEORETICAL POPULATION BIOLOGY
卷 82, 期 2, 页码 117-130出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.tpb.2012.05.001
关键词
Gene genealogies; Species tree; Taxonomic distinctiveness; Multiple merger coalescent processes; Monophyly
资金
- Marsden fund
- Royal Society
- Sabbatical Fellowship at the National Institute for Mathematical and Biological Synthesis
- National Science Foundation
- US Department of Homeland Security
- US Department of Agriculture through NSF [EF-0832858]
- EPSRC [EP/G052026/1]
- University of Tennessee, Knoxville
- EPSRC [EP/G052026/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G052026/1] Funding Source: researchfish
- Div Of Biological Infrastructure
- Direct For Biological Sciences [0832858] Funding Source: National Science Foundation
Probabilities of monophyly, paraphyly, and polyphyly of two-species gene genealogies are computed for modest sample sizes and compared for two different Lambda coalescent processes. Coalescent processes belonging to the Lambda coalescent family admit asynchronous multiple mergers of active ancestral lineages. Assigning a timescale to the time of divergence becomes a central issue when different populations have different coalescent processes running on different timescales. Clade probabilities in single populations are also computed, which can be useful for testing for taxonomic distinctiveness of an observed set of monophyletic lineages. The coalescence rates of multiple merger coalescent processes are functions of coalescent parameters. The effect of coalescent parameters on the probabilities studied depends on the coalescent process, and if the population is ancestral or derived. The probability of reciprocal monophyly tends to be somewhat lower, when associated with a Lambda coalescent, under the null hypothesis that two groups come from the same population. However, even for fairly recent divergence times, the probability of monophyly tends to be higher as a function of the number of generations for coalescent processes that admit multiple mergers, and is sensitive to the parameter of one of the example processes. (C) 2012 Elsevier Inc. All rights reserved.
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