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首页> 外文学位 >Multilocus and parametric analyses of the evolutionary history of the Amazonian peacock cichlids, genus Cichla (Teleostei: Cichlidae).
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Multilocus and parametric analyses of the evolutionary history of the Amazonian peacock cichlids, genus Cichla (Teleostei: Cichlidae).

机译：亚马逊孔雀丽鱼科鱼Cichla（Teleostei：Cichlidae）进化史的多基因座和参数分析。

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摘要

Accurate knowledge of species boundaries and species phylogeny are fundamental to testing hypotheses of recent evolutionary processes, but the estimation of these partitions is challenging due both to inherent confusion about what is being estimated as well as the data available to estimate them. Using multilocus data from mtDNA, microsatellites, and nuclear locus sequences of over 1100 individuals, we delimited eight separately evolving species of Cichla rather than the 15 described. Among species we found evidence of rare but widespread introgressive hybridization, while within these species we observed evidence of long-term gene exchange and constrained evolutionary trajectories. In most cases of hybridization, mtDNA was exchanged, while nuclear introgression was extensive to negligible. We estimated a phylogeny among Cichla species using sequences of 21 putatively unlinked and single copy nuclear loci. We observed minor discord among loci with respect to the concatenated tree, but when a phylogeny was estimated from separate locus genealogies while accounting for individual uncertainty, a congruent tree was reconstructed. We inferred that less variable loci contributed important phylogenetic information that altered the final phylogenetic estimate. We used extensive mtDNA datasets from three species of Cichla that are found in the Orinoco and Amazonas River basins to test the hypothesis that the Casiquiare River permits exchange of genes between populations in each basin. We inferred that either gene exchange has been occurring between these regions or has ceased very recently. Based on the inferred species relationships and using time-calibrated and coalescent-based analyses of unlinked loci, we inferred that the polyphyletic arrangement of mtDNA in C. orinocensis was not consistent with deep coalescence and most likely derived from a history of ancient introgression.
机译：对物种边界和物种系统发育的准确了解是测试最近进化过程的假设的基础，但是由于对所估计内容的固有困惑以及可用于估计它们的数据，因此对这些分区的估计具有挑战性。使用来自1100多个人的mtDNA，微卫星和核基因座序列的多基因座数据，我们划定了8种单独进化的Cichla物种，而不是所描述的15种。在物种中，我们发现了罕见但广泛的渐渗杂交的证据，而在这些物种中，我们观察到了长期基因交换和受限制的进化轨迹的证据。在杂交的大多数情况下，交换了mtDNA，而核基因渗入广泛到可以忽略不计。我们使用21个推定的非链接和单拷贝核基因座的序列估计了Cichla物种之间的系统发育。我们观察到级联树之间的基因座之间存在较小的不和谐，但是当从单独的基因座谱系中估计系统发育并考虑个体不确定性时，就可以重构出全等的树。我们推断，可变性较低的基因座贡献了重要的系统发育信息，从而改变了最终的系统发育估计。我们使用了在奥里诺科河和亚马孙河流域中发现的三种Cichla物种的广泛mtDNA数据集，以检验Casiquiare河允许每个流域的种群之间交换基因的假设。我们推断这些区域之间已经发生了基因交换，或者最近已经停止了基因交换。基于推断的物种关系，并使用基于时间校准和基于聚结的未链接基因座分析，我们推断线粒体线虫的mtDNA的多系排列与深度聚结不一致，并且很可能源自古代的渗入史。

著录项

  • 作者

    Willis, Stuart Clayton.;

  • 作者单位

    The University of Nebraska - Lincoln.;

  • 授予单位 The University of Nebraska - Lincoln.;
  • 学科 Biology Evolution and Development.;Biology Systematic.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 161 p.
  • 总页数 161
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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