Speciation and selection without sex

被引:100
作者
Birky, CW [1 ]
Wolf, C
Maughan, H
Herbertson, L
Henry, E
机构
[1] Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ 85745 USA
[2] Univ Arizona, Dept Mol & Cellular Biol, Tucson, AZ 85745 USA
[3] Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ 85745 USA
[4] Univ Arizona, Grad Interdisciplinary Genet Program, Tucson, AZ 85745 USA
关键词
cladogenesis; speciation; asexual reproduction; bdelloid rotifer; natural selection;
D O I
10.1007/s10750-005-4097-2
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
More than 100 females of the obligately asexual bdellold rotifers were isolated from nature and their mitochondrial cox1 genes (encoding cytochrome oxidase subunit 1) were sequenced. Phylogenetic analysis of the sequences showed that most of the isolates fall into 21 clades that show two characteristics of species: they are reciprocally monophyletic and have sequence diversities similar to that of species in other organisms. These clades have been evolving independently in spite of being effectively sympatric, indicating that they are adapted to different ecological niches. In support of this, at least some of the clades differ in morphology, food utilization, and temperature tolerance. We conclude that the bdelloid rotifers have undergone substantial speciation in the absence of sexual reproduction. We also used these sequences to test the prediction that asexual organisms should be subject to relaxed natural selection and hence will accumulate detrimental mutations. In contrast to this prediction, several estimates of the ratio K-a/K-s for the cox1 gene showed that this gene is subject to strong selection in the bdelloid rotifers.
引用
收藏
页码:29 / 45
页数:17
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