Testing comparative phylogeographic models of marine vicariance and dispersal using a hierarchical Bayesian approach
Testing comparative phylogeographic models of marine vicariance and dispersal using a hierarchical Bayesian approach
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DOI：
10.1186/1471-2148-8-322
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发表时间：
2008-11-27
影响因子：
3.4
通讯作者：
Meyer, Christopher P.
中科院分区：
文献类型：
--
作者：
Hickerson, Michael J.;Meyer, Christopher P.
背景：海洋异域物种形成是一个谜，因为远洋幼虫的扩散可以潜在地连接脱节的种群，从而防止生殖和形态分化。本文提出了一种新的层次近似贝叶斯计算模型（HABC），该模型检验了海洋异域物种形成的两个假设：“软变异”，即物种形成涉及到先前通过长距离基因流动连接的大范围祖先物种范围的碎片化；2)周边殖民化，周边群岛上的物种是从中心源区的抽奖式殖民化中出现的。HABC方法同时分析所有的系统地理数据集，以便跨分类对推断生物地理过程，同时明确允许每个分类对内人口统计学差异的不确定性。我们的方法使用比较系统地理数据，这些数据由来自多个共分布的分类群的单位点mtDNA序列组成，这些分类群包含对中心和外围种群。该方法应用于夏威夷群岛（11个分类对）和马克萨群岛（7个分类对）共分布的柯氏腹足动物的两个比较系统地理数据集。结果：考虑到马克萨斯群岛的数据，我们发现了强有力的证据，表明在马克萨斯群岛共同分布的所有7种柯瑞腹足类动物同时被殖民。相比之下，夏威夷数据中较小的样本量导致与夏威夷估计相关的更大的不确定性。虽然，超参数估计指向11个夏威夷分类单元对的一个子集的软方差，但超先验和超后验过于相似，无法得出明确的结论。这两个结果与已知的群岛地质历史并不矛盾。仿真验证了我们的方法可以在足够的采样条件下成功区分这两种历史。结论：虽然软变异和定殖在单个分类单元对中可能产生相似的遗传模式，但我们的分层贝叶斯模型可以潜在地检测出共同分布的分类单元对中是否有任何一种历史是显性过程。随着比较系统地理学数据集的增长，包括100个共同分布的分类单元对，HABC方法将非常适合于剖析群落组装和进化的时间模式，从而提供连接比较系统地理学和群落生态学的桥梁。
Background: Marine allopatric speciation is an enigma because pelagic larval dispersal can potentially connect disjunct populations thereby preventing reproductive and morphological divergence. Here we present a new hierarchical approximate Bayesian computation model (HABC) that tests two hypotheses of marine allopatric speciation: 1.) "soft vicariance", where a speciation involves fragmentation of a large widespread ancestral species range that was previously connected by long distance gene flow; and 2.) peripatric colonization, where speciations in peripheral archipelagos emerge from sweepstakes colonizations from central source regions. The HABC approach analyzes all the phylogeographic datasets at once in order to make across taxon-pair inferences about biogeographic processes while explicitly allowing for uncertainty in the demographic differences within each taxon-pair. Our method uses comparative phylogeographic data that consists of single locus mtDNA sequences from multiple co-distributed taxa containing pairs of central and peripheral populations. We use the method on two comparative phylogeographic data sets consisting of cowrie gastropod endemics co-distributed in the Hawaiian (11 taxon-pairs) and Marquesan archipelagos (7 taxon-pairs).Results: Given the Marquesan data, we find strong evidence of simultaneous colonization across all seven cowrie gastropod endemics co-distributed in the Marquesas. In contrast, the lower sample sizes in the Hawaiian data lead to greater uncertainty associated with the Hawaiian estimates. Although, the hyper-parameter estimates point to soft vicariance in a subset of the 11 Hawaiian taxon-pairs, the hyper-prior and hyper-posterior are too similar to make a definitive conclusion. Both results are not inconsistent with what is known about the geologic history of the archipelagos. Simulations verify that our method can successfully distinguish these two histories across a wide range of conditions given sufficient sampling.Conclusion: Although soft vicariance and colonization are likely to produce similar genetic patterns when a single taxon-pair is used, our hierarchical Bayesian model can potentially detect if either history is a dominant process across co-distributed taxon-pairs. As comparative phylogeographic datasets grow to include > 100 co-distributed taxon-pairs, the HABC approach will be well suited to dissect temporal patterns in community assembly and evolution, thereby providing a bridge linking comparative phylogeography with community ecology.