Mendelson Tamra C, Siegel Alex M, Shaw Kerry L
Department of Biology, University of Maryland, College Park, MD 20742, USA.
Mol Ecol. 2004 Dec;13(12):3787-96. doi: 10.1111/j.1365-294X.2004.02375.x.
Determining the mode, or geographical context, of speciation is a critical first step to understanding the evolutionary mechanisms that cause new species to arise. In this study, we estimated phylogenetic relationships in the cerasina species group of the Hawaiian cricket genus Laupala (Orthoptera: Gryllidae) to test competing phylogeographical hypotheses and thus infer the mode of speciation. A previous phylogenetic result based on nuclear sequence data suggested that populations of L. cerasina on the Big Island of Hawaii are the result of two independent colonizations from Maui, implying parallel speciation and convergent song evolution, and contradicting systematic hypotheses based on behavioural and morphological data. We used amplified fragment length polymorphisms to investigate further the relationships among species and populations in the cerasina species group. Results of these analyses provide a robust estimate of phylogenetic relationships and support the phylogeographical history indicated by behavioural and morphological data.
确定物种形成的模式或地理背景是理解导致新物种出现的进化机制的关键第一步。在本研究中，我们估计了夏威夷蟋蟀劳帕拉属（直翅目：蟋蟀科）中塞拉西纳物种组的系统发育关系，以检验相互竞争的系统地理学假设，从而推断物种形成的模式。基于核序列数据的先前系统发育结果表明，夏威夷大岛上的塞拉西纳种群是来自毛伊岛的两次独立殖民的结果，这意味着平行物种形成和趋同的鸣声进化，与基于行为和形态数据的系统假设相矛盾。我们使用扩增片段长度多态性来进一步研究塞拉西纳物种组中物种和种群之间的关系。这些分析结果提供了对系统发育关系的可靠估计，并支持了行为和形态数据所表明的系统地理历史。
