Page R D, Lee P L, Becher S A, Griffiths R, Clayton D H
Division of Environmental and Evolutionary Biology, University of Glasgow, United Kingdom.
Mol Phylogenet Evol. 1998 Apr;9(2):276-93. doi: 10.1006/mpev.1997.0458.
A phylogeny for the lice (Insecta: Phthiraptera: genus Dennyus) parasitic on swiftlets (Aves: Collocalliinae) was constructed based on mitochondrial cytochrome b DNA sequences. This phylogeny is congruent with previous phenetic analyses of morphometric data for the lice. Comparison with a previously obtained phylogeny for the hosts indicates some degree of cospeciation. These cospeciation events are used to compare relative rates of evolution in the birds and their lice for the same segment of the cytochrome b gene. Cytochrome b is evolving two to three times more rapidly in lice than in birds, and louse cytochrome b is highly divergent compared to that of most other insects. Although generation time has been suggested as an explanation for the disparity in evolutionary rates between lice and their hosts, we suggest that the small effective population sizes of lice coupled with founder events occurring during transmission to new host individuals may be an important factor.
基于线粒体细胞色素b DNA序列构建了寄生于金丝燕（雀形目：侏金丝燕亚科）的虱类（昆虫纲：吸虱目：丹尼虱属）的系统发育树。该系统发育树与先前对虱类形态测量数据的表型分析结果一致。与先前获得的宿主系统发育树进行比较表明存在一定程度的协同物种形成。这些协同物种形成事件被用于比较细胞色素b基因同一段落中鸟类及其虱类的相对进化速率。细胞色素b在虱类中的进化速度比在鸟类中快两到三倍，并且与大多数其他昆虫相比，虱类的细胞色素b高度分化。尽管有人提出世代时间可解释虱类与其宿主进化速率的差异，但我们认为虱类有效种群规模较小以及在传播到新宿主个体过程中发生的奠基者事件可能是一个重要因素。
