The influence of body size and net diversification rate on molecular evolution during the radiation of animal phyla |
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| Authors: | Eric Fontanillas John J Welch Jessica A Thomas Lindell Bromham |
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| Institution: | (1) Centre for the Study of Evolution, School of Life Sciences, University of Sussex, Falmer, Brighton, BN1 9QG, UK;(2) Institute of Evolutionary Biology; School of Biological Sciences, University of Edinburgh, West Mains Rd, Edinburgh, EH9 3JT, UK;(3) Centre for Macroevolution and Macroecology, School of Botany and Zoology, Australian National University, Canberra, A.C.T. 0200, Australia |
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| Abstract: | Background Molecular clock dates, which place the origin of animal phyla deep in the Precambrian, have been used to reject the hypothesis
of a rapid evolutionary radiation of animal phyla supported by the fossil record. One possible explanation of the discrepancy
is the potential for fast substitution rates early in the metazoan radiation. However, concerted rate variation, occurring
simultaneously in multiple lineages, cannot be detected by "clock tests", and so another way to explore such variation is
to look for correlated changes between rates and other biological factors. Here we investigate two possible causes of fast
early rates: change in average body size or diversification rate of deep metazoan lineages. |
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