Reproductive isolation caused by colour pattern mimicry

被引:517
作者
Jiggins, CD
Naisbit, RE
Coe, RL
Mallet, J
机构
[1] UCL, Galton Lab, London NW1 2HE, England
[2] Smithsonian Trop Res Inst, Balboa, Panama
[3] Univ Cambridge Downing Coll, Cambridge CB2 1DQ, England
关键词
D O I
10.1038/35077075
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
Speciation is facilitated if ecological adaptation directly causes assortative mating(1), but few natural examples are known. Here we show that a shift in colour pattern mimicry was crucial in the origin of two butterfly species. The sister species Heliconius melpomene and Heliconius cydno recently diverged to mimic different model taxa, and our experiments show that their mimetic coloration is also important in choosing mates. Assortative mating between the sister species means that hybridization is rare in nature, and the few hybrids that are produced are nonmimetic, poorly adapted intermediates. Thus, the mimetic shift has caused both pre-mating and post-mating isolation. In addition, individuals from a population of H. melpomene allopatric to H. cydno court and mate with H. cydno more readily than those from a sympatric population. This suggests that assortative mating has been enhanced in sympatry.
引用
收藏
页码:302 / 305
页数:5
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