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首页> 外文会议>International Conference on Bioinformatics and Computational Biology >Sensitivity of a Phylogeny of the Triassic Avian-Line Radiation to Character-Transition Ordering
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Sensitivity of a Phylogeny of the Triassic Avian-Line Radiation to Character-Transition Ordering

机译：三叠纪禽流线辐射系统发育的敏感性对特征转换排序

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It is generally accepted that modern birds descended from reptiles: in popular parlance, "The dinosaurs didn't die out; they merely took to the air". Based on the fossil record, by the Late Triassic (～180-195 million years before present (MABP)) reptiles with feathers and distinctly bird-like skeletons had appeared. It is much less clear when the delineation of avian characteristics first arose. Attempts to push the avian/reptilian boundary earlier than the Late Triassic challenge today's phylogenetic methods. Based on the maximum parsimony (MP) method, it has been suggested that whether a Middle-Triassic (～195-210 MABP) avian-line radiation (Ornithodira) within the archosaurs is contemporaneous with the radiation of crocodilian-line (Pseudosuchia) forms is sensitive to whether the transitions of character-values at ～15 character-positions in the taxon descriptors of the data set of interest are restricted to "nearest"-value (i.e., are "ordered") changes. Here I show that Bayesian phylogenetic analysis implies essentially the same phylogeny is obtained regardless of whether the transitions are ordered.
机译：普遍认为，现代鸟类从爬行动物中解放出来：在流行的傻瓜中，“恐龙并没有消失;他们只是走到空中”。基于化石记录，由晚期三叠纪（〜180-195万年前（MABP））爬行动物，似乎鲜明的鸟类骨骼。当禽类特征划定首次出现时，它就不太清楚。试图提前推动禽/爬行动物的边界，而不是晚期三叠系挑战今天的系统发育方法。基于最大分析（MP）方法，已经提出了古代三叠系（〜195-210 mABP）禽流线辐射（奥纳迪拉）的禽流线辐射（Ornithodira）是与鳄鱼 - 线（假瘤）形式的辐射的辐射对数据集的分类符中的〜15个字符位置的字符值的转换是敏感的，该数据集的〜15个字符位置被限制为“最近” - value（即，是“订购的”）更改。在此表明，贝叶斯系统发育分析基本上意味着获得相同的系统发生，而不管过渡是否被命令。

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