期刊
SCIENCE
卷 321, 期 5895, 页码 1485-1488出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1161833
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资金
- Marshall Scholarship and Paleontological Society
- UK Natural Environment Research Council
- Royal Society
- Natural Environment Research Council [NE/C518973/1] Funding Source: researchfish
- NERC [NE/C518973/1] Funding Source: UKRI
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.
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