Body size evolution in Mesozoic birds

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	Body size evolution in Mesozoic birds
	Hone, D. W. E.; Dyke, G. J.; Haden, M.; Benton, M. J.; dhone@ivpp.ac.cn
	2008
发表期刊	J EVOLUTION BIOL
ISSN	1010-061X
卷号	21 期号:2 页码:618-624
摘要	The tendency for the mean body size of taxa within a clade to increase through evolution (Cope's Rule) has been demonstrated in a number of terrestrial vertebrate groups. However, because avian body size is strongly constrained by flight, any increase in size during the evolution of this lineage should be limited - there is a maximum size that can be attained by a bird for it to be able to get off the ground. Contrary to previous interpretations of early avian evolution, we demonstrate an overall increase in body size across Jurassic and Cretaceous flying birds: taxon body size increases from the earliest Jurassic through to the end of the Cretaceous, across a time span of 70 Myr. Although evidence is limited that this change is directional, it is certainly nonrandom. Relative size increase occurred presumably as the result of an increase in variance as the avian clade diversified after the origin of flight: a progression towards larger body size is seen clearly within the clades Pygostylia and Ornithothoraces. In contrast, a decrease in body size characterizes the most crownward lineage Ornithuromorpha, the clade that includes all extant taxa, and potentially may explain the survival of these birds across the Cretaceous-Palaeogene boundary. As in all other dinosaurs, counter selection for small size is seen in some clades, whereas body size is increasing overall.
关键词	Copes Rule Mass Mammals Radiation Trends Diversification Explanation Pterosaurs Carnivores Allometry
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文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4851
专题	中科院古脊椎所（2000年以后）
通讯作者	dhone@ivpp.ac.cn
推荐引用方式 GB/T 7714	Hone, D. W. E.,Dyke, G. J.,Haden, M.,et al. Body size evolution in Mesozoic birds[J]. J EVOLUTION BIOL,2008,21(2):618-624.
APA	Hone, D. W. E.,Dyke, G. J.,Haden, M.,Benton, M. J.,&dhone@ivpp.ac.cn.(2008).Body size evolution in Mesozoic birds.J EVOLUTION BIOL,21(2),618-624.
MLA	Hone, D. W. E.,et al."Body size evolution in Mesozoic birds".J EVOLUTION BIOL 21.2(2008):618-624.

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