Superiority, competition, and opportunism in the evolutionary radiation of dinosaurs
Superiority, competition, and opportunism in the evolutionary radiation of dinosaurs
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DOI：
10.1126/science.1161833
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发表时间：
2008-09-12
期刊：
影响因子：
56.9
通讯作者：
Lloyd, Graeme T.
中科院分区：
文献类型：
--
作者：
Brusatte, Stephen L.;Benton, Michael J.;Lloyd, Graeme T.
在三叠纪晚期，从2.3亿年到2亿年前，恐龙的崛起和多样化是一个典型的进化辐射的例子，假设竞争性的替代。一项比较基底恐龙和它们的主要“竞争对手”--鳄跗主龙的进化速率和形态差异的研究表明，恐龙表现出较低的差异和难以区分的特征进化速率。作为一个整体，三叠纪初龙的辐射的特点是下降的进化速率和增加的差异，这表明了脱钩的性格进化的身体计划的变化。研究结果强烈表明，历史偶然性，而不是长期的竞争或普遍的“优势”，是恐龙崛起的主要因素。
The rise and diversification of the dinosaurs in the Late Triassic, from 230 to 200 million years ago, is a classic example of an evolutionary radiation with supposed competitive replacement. A comparison of evolutionary rates and morphological disparity of basal dinosaurs and their chief "competitors," the crurotarsan archosaurs, shows that dinosaurs exhibited lower disparity and an indistinguishable rate of character evolution. The radiation of Triassic archosaurs as a whole is characterized by declining evolutionary rates and increasing disparity, suggesting a decoupling of character evolution from body plan variety. The results strongly suggest that historical contingency, rather than prolonged competition or general " superiority," was the primary factor in the rise of dinosaurs.