生物
泛大陆
古生物学
生物扩散
消光(光学矿物学)
捕食
白垩纪
消亡
生物集群灭绝
适应性辐射
食草动物
生态学
生物地理学
进化生物学
系统发育树
二叠纪
人口
生物化学
人口学
构造盆地
社会学
政治学
基因
法学
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:1999-06-25
卷期号:284 (5423): 2137-2147
被引量:774
标识
DOI:10.1126/science.284.5423.2137
摘要
The ascendancy of dinosaurs on land near the close of the Triassic now appears to have been as accidental and opportunistic as their demise and replacement by therian mammals at the end of the Cretaceous. The dinosaurian radiation, launched by 1-meter-long bipeds, was slower in tempo and more restricted in adaptive scope than that of therian mammals. A notable exception was the evolution of birds from small-bodied predatory dinosaurs, which involved a dramatic decrease in body size. Recurring phylogenetic trends among dinosaurs include, to the contrary, increase in body size. There is no evidence for co-evolution between predators and prey or between herbivores and flowering plants. As the major land masses drifted apart, dinosaurian biogeography was molded more by regional extinction and intercontinental dispersal than by the breakup sequence of Pangaea.
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