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• W2173836380 endingPage "20150042" @default.
• W2173836380 startingPage "20150042" @default.
• W2173836380 abstract "The morphological disparity of species within major clades shows a variety of trajectory patterns through evolutionary time. However, there is a significant tendency for groups to reach their maximum disparity relatively early in their histories, even while their species richness or diversity is comparatively low. This pattern of early high-disparity suggests that there are internal constraints (e.g. developmental pleiotropy) or external restrictions (e.g. ecological competition) upon the variety of morphologies that can subsequently evolve. It has also been demonstrated that the rate of evolution of new character states decreases in most clades through time (character saturation), as does the rate of origination of novel bodyplans and higher taxa. Here, we tested whether there was a simple relationship between the level or rate of character state exhaustion and the shape of a clade's disparity profile: specifically, its centre of gravity (CG). In a sample of 93 extinct major clades, most showed some degree of exhaustion, but all continued to evolve new states up until their extinction. Projection of states/steps curves suggested that clades realized an average of 60% of their inferred maximum numbers of states. Despite a weak but significant correlation between overall levels of homoplasy and the CG of clade disparity profiles, there were no significant relationships between any of our indices of exhaustion curve shape and the clade disparity CG. Clades showing early high-disparity were no more likely to have early character saturation than those with maximum disparity late in their evolution." @default.
• W2173836380 created "2016-06-24" @default.
• W2173836380 creator A5015164792 @default.
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• W2173836380 creator A5065829613 @default.
• W2173836380 creator A5078715931 @default.
• W2173836380 creator A5084769884 @default.
• W2173836380 date "2015-12-06" @default.
• W2173836380 modified "2023-10-02" @default.
• W2173836380 title "What limits the morphological disparity of clades?" @default.
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