Departamento de Biodiversidad y Biología Evolutiva, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain.
Mol Phylogenet Evol. 2010 Oct;57(1):327-42. doi: 10.1016/j.ympev.2010.06.007. Epub 2010 Jun 18.
This study describes the mitochondrial structure of the Iberian population of the white-clawed crayfish Austropotamobius italicus under a phylogeographyc context and considering the genetic variation of the entire taxon distributed in the southern part of Europe. Current sub-specific hypotheses were only partially supported, and a genetic structure related to climatic events is postulated as the main factor explaining its variation. Due to a more extensive sampling and sequencing strategy, the two different mitochondrial lineages of the taxon were found in the Iberian Peninsula, and haplotype variation of populations was observed in a considerable extent regarding that reported in previous studies from other parts of its distribution range. This evidence, together with the timing of Pleistocene expansion events for the Iberian populations (approximately 10,772-20,004 YBP) as well as an estimated splitting time from Italian populations previous to the last glacial maximum (T=34,858 years) suggest that the presence of A. italicus in the Iberian Peninsula could be explained by a combination of contrasting dispersal histories and a complex biogeographic scenario. We propose that although possible, human translocations may not be the only cause to explain the complex distribution patterns of species strongly affected by recent climatic events.
本研究在系统地理学背景下描述了伊比利亚白足龙虾 Austropotamobius italicus 的线粒体结构，并考虑了分布在欧洲南部的整个分类群的遗传变异。目前的亚种假设仅得到部分支持，并且提出与气候事件相关的遗传结构是解释其变异的主要因素。由于更广泛的采样和测序策略，在伊比利亚半岛发现了该分类群的两种不同的线粒体谱系，并且与以前在其分布范围的其他地区进行的研究相比，观察到了种群的单倍型变异。这一证据，以及伊比利亚种群的更新世扩张事件的时间（大约 10772-20004 年前）以及上一次冰期最大值之前与意大利种群的分裂时间（T=34858 年），表明伊比利亚半岛上 A. italicus 的存在可能是由对比扩散历史和复杂生物地理情景的组合所解释的。我们提出，尽管可能存在，但人类的转移可能不是解释受最近气候事件强烈影响的物种复杂分布模式的唯一原因。
