期刊
MOLECULAR ECOLOGY
卷 31, 期 2, 页码 620-631出版社
WILEY
DOI: 10.1111/mec.15836
关键词
ddRADseq; gene flow; genetic variation; glaciation; phylogeography; ring species; SNPs
资金
- Division of Graduate Education [2014177193]
- Division of Environmental Biology [1144630]
- Division Of Environmental Biology
- Direct For Biological Sciences [1144630] Funding Source: National Science Foundation
The study reveals that the population divergence of the western fence lizard shows hierarchical structure geographically with evidence of gene flow, supporting the importance of isolation-expansion model in population history. Despite potential population divergence as they spread northward, there is evidence of gene flow among populations at the northern terminus.
Divergence is often ephemeral, and populations that diverge in response to regional topographic and climatic factors may not remain reproductively isolated when they come into secondary contact. We investigated the geographical structure and evolutionary history of population divergence within Sceloporus occidentalis (western fence lizard), a habitat generalist with a broad distribution that spans the major biogeographical regions of Western North America. We used double digest RAD sequencing to infer population structure, phylogeny and demography. Population genetic structure is hierarchical and geographically structured with evidence for gene flow between biogeographical regions. Consistent with the isolation-expansion model of divergence during Quaternary glacial-interglacial cycles, gene flow and secondary contact are supported as important processes explaining the demographic histories of populations. Although populations may have diverged as they spread northward in a ring-like manner around the Sierra Nevada and southern Cascade Ranges, there is strong evidence for gene flow among populations at the northern terminus of the ring. We propose the concept of an ephemeral ring species and contrast S. occidentalis with the classic North American ring species, Ensatina eschscholtzii. Contrary to expectations of lower genetic diversity at northern latitudes following post-Quaternary-glaciation expansion, the ephemeral nature of divergence in S. occidentalis has produced centres of high genetic diversity for different reasons in the south (long-term stability) vs. the north (secondary contact).
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