Phylogenetic analysis of partial sequences of elongation factor 1alpha identifies major groups of lice (Insecta: Phthiraptera).
Phylogenetic analysis of partial sequences of elongation factor 1alpha identifies major groups of lice (Insecta: Phthiraptera).
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对延伸因子 1α 的部分序列进行系统发育分析，确定了虱子的主要类群（昆虫纲：Phthiraptera）。
DOI：
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发表时间：
2001
影响因子：
4.1
通讯作者：
R. D. M. Page
中科院分区：
文献类型：
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作者：
Robert H Cruickshank;K. Johnson;Vincent S Smith;Richard J Adams;D. H. Clayton;R. D. M. Page
作为首次尝试使用分子数据来解析虱子的四个亚目与 Ischnocera 亚目之间的关系，我们对 127 个虱子（昆虫纲：Phthiraptera）以及来自 Psocoptera 的外类群的延伸因子 1α 基因的 347 bp 片段进行了测序。发现了许多得到充分支持的单系类群，但其中许多类群之间的关系无法解决。虽然高分歧下的多重替换和短时间内的古代辐射可能导致了这个问题，但我们将这种缺乏分辨率的大部分归因于类群与性状的高比例。然而，序列数据明确支持了许多与形态分类学结论不一致的重要关系。其中包括Chelopistes和Oxylipeurus的姐妹群关系，这两种虱子在同一宿主上占据不同的生态位，之前被分配到不同的科。这些结果提供了支持这一假设的证据，即虱子在宿主上原位形成物种以响应生态位专门化，并且这导致共享相似生态位的不同宿主群体的虱子形态趋同。我们讨论了克服这一大数据集局限性的尝试，包括使用叶稳定性分析（一种分析系统发育树中类群稳定性的新方法），并检查了一些基于传统分类学和宿主关联的关系假设。
As a first attempt to use molecular data to resolve the relationships between the four suborders of lice and within the suborder Ischnocera, we sequenced a 347-bp fragment of the elongation factor 1alpha gene of 127 lice (Insecta: Phthiraptera) as well as outgroup taxa from the order Psocoptera. A number of well-supported monophyletic groups were found but the relationships among many of these groups could not be resolved. While it is probable that multiple substitutions at high divergences and ancient radiation over a short period of time have contributed to the problem, we attribute most of this lack of resolution to the high ratio of taxa to characters. Nevertheless, the sequence data unequivocally support a number of important relationships that are at variance with the conclusions of morphological taxonomy. These include the sister group relationship of Chelopistes and Oxylipeurus, two lice occupying different ecological niches on the same host, which have previously been assigned to different families. These results provide evidence in support of the hypothesis that lice have speciated in situ on the host in response to niche specialization and that this has given rise to convergent morphologies in the lice of different host groups which share similar ecological niches. We discuss our attempts to overcome the limitations of this large data set, including the use of leaf stability analysis, a new method for analyzing the stability of taxa in a phylogenetic tree, and examine a number of hypotheses of relationships based on both traditional taxonomy and host associations.