Phylogeography of the red diamond rattlesnake

Many studies have investigated the phylogeographic history of species on the Baja California Peninsula, and they often show one or more genetic breaks that are spatially concordant among many taxa. These phylogeographic breaks are commonly attributed to vicariance as a result of geological or climatic changes, followed by secondary contact when barriers are no longer present. We use restriction-site associated DNA sequence data and a phylogeographic model selection approach to explicitly test the secondary contact hypothesis in the red diamond rattlesnake, Crotalus ruber.

诸多研究已针对下加利福尼亚半岛（Baja California Peninsula）物种种群的系统地理学（phylogeography）历史展开探究，结果显示诸多类群（taxa）均呈现出一处或多处空间上一致的遗传断裂（genetic breaks）。这类系统地理学断裂通常被归因于地质或气候变化引发的隔离分化（vicariance），当地理屏障不复存在时，种群间便会发生二次接触（secondary contact）。本研究采用限制性位点相关DNA测序（restriction-site associated DNA sequence）数据与系统地理学模型选择方法，对红钻石响尾蛇（Crotalus ruber）的二次接触假说进行明确检验。