Patterns and Processes of Marine Speciation: A Case Study of Indo-West Pacific Cowries

9807316保利我们将使用两个线粒体基因(COI和16S)为一组有充分证据和多样化的海洋腹足类动物--海牛--生成一个强大、完整的系统发育图。这一发展史将通过确定不同领域和物种形成机制的相对重要性，确立物种形成的模式，并检验多样化假说。CORIES是测试印度-西太平洋物种形成过程的理想群体，因为1。它们极其多样化；现存的148种印度-西太平洋宝贝来自15个独立的谱系，其中一个自中新世以来已经产生了69个物种，2。它们有很好的化石记录。它们的地理范围有很好的记录，4)许多姊妹种仍然保留着不重叠的分布。地理变异在许多物种中很常见，6.)初步的系统发展已经掌握在手中。贝壳是印度-西太平洋巨大而快速的进化辐射的缩影。这项拟议的工作将是在这个最多样化的海洋区域分析物种形成模式的第一次重大分子系统学尝试，而且，由于它是在一个具有巨大系统地理力量的生物群体中，它有望检验关于印度-西太平洋生物地理学和多样性的许多假设。

9807316 Paulay We will generate a robust, complete phylogeny using two mitochondrial genes (COI and 16S) for a well documented and diverse group of marine gastropods, the cowries. This phylogeny will establish the patterns of speciation and test hypotheses of diversification by establishing the relative importance of different arenas and speciation mechanisms. Cowries are an ideal group for testing speciation processes in the Indo-West Pacific because 1.) they are extremely diverse; there are 148 extant species of Indo-West Pacific cowries that have been derived from 15 independent lineages, one of which has given rise to 69 species since the Miocene, 2.) they have a good fossil record, 3.) their geographic ranges are well-documented, 4.) many sister species still retain non-overlapping distributions, 5.) geographic variation is common within many species, and 6.) an initial phylogeny is already in hand. Cowries epitomize the large and rapid evolutionary radiations that so characterize the Indo-West Pacific. The proposed work will be the first major molecular phylogenetic attempt to analyze patterns of speciation in this most diverse marine region, and, as it is in a group of organisms with great phylogeographic power, it promises to test numerous hypotheses about Indo-West Pacific biogeography and diversification.