Comparative phylogeography uncovers evolutionary past of Holarctic dragonflies.
Comparative phylogeography uncovers evolutionary past of Holarctic dragonflies.
复制标题
比较植物地理学发现了霍拉克蜻蜓的进化过去。
作者：
Kohli M;Djernæs M;Sanchez Herrera M;Sahlen G;Pilgrim E;Simonsen TJ;Olsen K;Ware J
在这里，我们调查的进化历史的五个北方物种，以评估什么样的作用，最后一次冰期可能在他们目前的分布。我们研究了以下物种的种群结构并估计了它们在全北极范围内的种群分化时间：Aeshna juncea（Linnaeus）、Aeshna subarctica步行者、Sympetrum daae（Sulzer）、Libellula quadramaculata Linnaeus和Somatochlora sahlbergi Trybom。我们的研究结果表明，一个共同的生态地理格局在所有物种，除了S。sahlbergi。首先，我们发现北美人和欧洲人在遗传上是不同的，可能已经分离了40多万年。其次，我们的数据表明，基于遗传学，来自大白令地区（白令，日本和中国）的人群具有与北美或欧洲聚类的单倍型，这取决于物种，而不是具有共同的地理亲缘关系。这可能是第四纪海平面波动和冰盖覆盖影响扩散路线和避难所的结果。事实上，冰川时期的白令吉亚可能既是蜻蜓的避难所，也是一个中转区。Somatochlorasahlbergi在其分布范围内没有遗传变异，因此不具有在这里研究的其他环北方蜻蜓中发现的地理模式。最后，我们讨论了Sympetrumdanae的分类地位，我们的研究结果表明，这是一个物种复合体，包括两个物种，一个发现于欧亚大陆通过白令海，另一个在北美东部和南部的白令海。通过这项研究，我们提出了一个共同的历史之间的不同物种从不同的家庭蜻蜓，这是受气候波动的过去。
Here, we investigate the evolutionary history of five northern dragonfly species to evaluate what role the last glaciation period may have played in their current distributions. We look at the population structure and estimate divergence times for populations of the following species: Aeshna juncea (Linnaeus), Aeshna subarctica Walker, Sympetrum danae (Sulzer), Libellula quadrimaculata Linnaeus and Somatochlora sahlbergi Trybom across their Holarctic range. Our results suggest a common phylogeographic pattern across all species except for S. sahlbergi. First, we find that North American and European populations are genetically distinct and have perhaps been separated for more than 400,000 years. Second, our data suggests that, based on genetics, populations from the Greater Beringian region (Beringia, Japan and China) have haplotypes that cluster with North America or Europe depending on the species rather than having a shared geographic affinity. This is perhaps a result of fluctuating sea levels and ice sheet coverage during the Quaternary period that influenced dispersal routes and refugia. Indeed, glacial Beringia may have been as much a transit zone as a refugia for dragonflies. Somatochlora sahlbergi shows no genetic variation across its range and therefore does not share the geographic patterns found in the other circumboreal dragonflies studied here. Lastly, we discuss the taxonomic status of Sympetrum danae, which our results indicate is a species complex comprising two species, one found in Eurasia through Beringia, and the other in North America east and south of Beringia. Through this study we present a shared history among different species from different families of dragonflies, which are influenced by the climatic fluctuations of the past.