Conflict between datasets and phylogeny of centipedes: an analysis based on seven genes and morphology
Conflict between datasets and phylogeny of centipedes: an analysis based on seven genes and morphology
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DOI：
10.1098/rspb.2005.3365
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发表时间：
2006-03-07
影响因子：
4.7
通讯作者：
Edgecombe, GD
中科院分区：
文献类型：
--
作者：
Giribet, G;Edgecombe, GD
虽然蜈蚣的进化史在形态学上已经有了充分的一致性，但最近结合分子数据的分析显示，在解决蜈蚣树中最深的节点时存在重大冲突。虽然一些基因支持经典（形态学）假设，但其他人提出了另一种树，其中仅限于塔斯马尼亚和新西兰的残留目的Craterostigrnomorpha被解析为所有其他蜈蚣的姐妹群。我们结合了所有可用的数据，包括7个基因（共超过8 kb的遗传信息）和153个形态特征的24蜈蚣，并进行了敏感性分析，以评估冲突所在。我们的数据表明，经典的假设主要是当核核糖体基因发挥优势的字符数据矩阵（在高间隙成本），而替代树时，蛋白质编码基因占大多数的枝藻长度（在低间隙成本）。在这种特殊情况下，添加遗传数据并不会产生比独立分析某些基因时更稳定的深层蜈蚣关系假设，但数据中的整体冲突可以通过敏感性分析清楚地检测出来，并且随着数据的添加，浅层节点的支持和稳定性增加。
Although the phylogeny of centipedes has found ample agreement based on morphology, recent analyses incorporating molecular data show major conflict at resolving the deepest nodes in the centipede tree. While some genes support the classical (morphological) hypothesis, others suggest an alternative tree in which the relictual order Craterostigrnomorpha, restricted to Tasmania and New Zealand, is resolved as the sister group to all other centipedes. We combined all available data including seven genes (totalling more than 8 kb of genetic information) and 153 morphological characters for 24 centipedes, and conducted a sensitivity analysis to evaluate where the conflict resides. Our data showed that the classical hypothesis is obtained primarily when nuclear ribosomal genes exert dominance in the character data matrix (at high gap costs), while the alternative tree is obtained when protem-encoding genes account for most of the cladograrn length (at low gap costs). In this particular case, the addition of genetic data does not produce a more stable hypothesis for deep centipede relationships than when analysing certain genes independently, but the overall conflict in the data can be clearly detected via a sensitivity analysis, and support and stability of shallow nodes increase as data are added.