Large punctuational contribution of speciation to evolutionary divergence at the molecular level

被引:163
作者
Pagel, Mark [1 ]
Venditti, Chris [1 ]
Meade, Andrew [1 ]
机构
[1] Univ Reading, Sch Biol Sci, Reading RG6 6AJ, Berks, England
基金
英国自然环境研究理事会;
关键词
RAPID EVOLUTION; SUBSTITUTIONS; EQUILIBRIUM; POPULATIONS; PHYLOGENIES; GRADUALISM; SEQUENCE; DYNAMICS; TEMPO; MODEL;
D O I
10.1126/science.1129647
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A long-standing debate in evolutionary biology concerns whether species diverge gradually through time or by punctuational episodes at the time of speciation. We found that approximately 22% of substitutional changes at the DNA level can be attributed to punctuational evolution, and the remainder accumulates from background gradual divergence. Punctuational effects occur at more than twice the rate in plants and fungi than in animals, but the proportion of total divergence attributable to punctuational change does not vary among these groups. Punctuational changes cause departures from a clock-like tempo of evolution, suggesting that they should be accounted for in deriving dates from phylogenies. Punctuational episodes of evolution may play a larger role in promoting evolutionary divergence than has previously been appreciated.
引用
收藏
页码:119 / 121
页数:3
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