Bilton David T, Turner Lucy, Foster Garth N
Marine Biology & Ecology Research Centre, University of Plymouth , Plymouth , United Kingdom.
Aquatic Coleoptera Conservation Trust , Ayr , Scotland.
PeerJ. 2017 Mar 9;5:e3076. doi: 10.7717/peerj.3076. eCollection 2017.
The species group includes both widespread and range restricted diving beetle taxa in the western Palaearctic, some of which have been divided into a number of geographical subspecies. Of these, is distributed in the far west of Europe, from central Spain to southern Britain, and has been split into three subspecies, occurring in Iberia ( sst.), France () and England () respectively-the last of these being a rare example of an insect taxon apparently endemic to northern Europe. Here we explore inter-relationships between populations and subspecies of and related members of the subgroup, using mitochondrial COI sequence data. We reveal widespread discordance between mitochondrial DNA sequence variation and morphology in areas where and come into contact, consistent with historical introgressive hybridization between these taxa. In light of this discordance, the lack of clear genetic divergence between subspecies, and the fact that both and are morphologically intermediate between sstr. and , we suggest that these taxa may be of hybridogenic origin, rather than representing discrete evolutionary lineages.
该物种组包括古北区西部广泛分布和分布范围受限的潜水甲虫类群，其中一些已被划分为多个地理亚种。其中，[物种名称]分布于欧洲最西部，从西班牙中部到英国南部，并已被分为三个亚种，分别出现在伊比利亚（[亚种名称1]）、法国（[亚种名称2]）和英国（[亚种名称3]）——其中最后一个是明显为北欧特有的昆虫类群的罕见例子。在这里，我们利用线粒体COI序列数据，探索[物种名称]的种群和亚种与[相关物种组名称]亚组相关成员之间的相互关系。我们发现在[物种名称1]和[物种名称2]接触的区域，线粒体DNA序列变异与形态之间存在广泛的不一致，这与这些类群之间历史上的渐渗杂交一致。鉴于这种不一致、[物种名称]亚种之间缺乏明显的遗传分化，以及[物种名称1]和[物种名称2]在形态上都介于[物种名称3]亚种之间这一事实，我们认为这些类群可能起源于杂交，而不是代表离散的进化谱系。
