Costedoat C, Chappaz R, Barascud B, Guillard O, Gilles A
EA 3781 EGEE Evolution Genome Environment. Universite de Provence, Centre St. Charles, Case 36, 3 Place Victor Hugo 13331 Marseille, France.
Mol Phylogenet Evol. 2006 Oct;41(1):127-48. doi: 10.1016/j.ympev.2006.04.022. Epub 2006 May 10.
The dace (Leuciscus leuciscus), with a very large geographic distribution all over Europe, represents an interesting species model for studies of the global mechanisms underlying aquatic system biodiversity. To assess the congruence with the past colonization process hypothesis of the freshwater fauna in Western Europe, we investigated the evolutionary history of this species, by integrating morphological variation (eight meristic characters), mitochondrial (cytochrome b, 16S rDNA and control region, over a total of 2169 bp) and nuclear (12 allozymes loci) phylogenetic relationships, and investigating population dynamics via expansion, migration, bottleneck, and divergence time analyses. We carried out nested clade phylogeographic analysis for a total of 663 specimens from 31 populations taken from all over the distribution area. Unlike previous studies, we found that L. leuciscus is currently constituted by five lineages belonging to two clades (yielding 6.3% of pairwise divergence). The relationships between these lineages were accounted for by complex biogeographical patterns due to Pliocene and Pleistocene paleoclimatic events, validating the identification of new glacial refuges for freshwater fish in Western Europe. Finally, we demonstrated hybridization between L. leuciscus and Leuciscus idus.
雅罗鱼（Leuciscus leuciscus）在欧洲各地有着非常广泛的地理分布，是研究水生系统生物多样性潜在全球机制的一个有趣物种模型。为了评估与西欧淡水动物过去殖民化过程假说的一致性，我们通过整合形态变异（八个可数性状）、线粒体（细胞色素b、16S rDNA和控制区，共2169 bp）和核（12个等位酶位点）系统发育关系，并通过扩张、迁移、瓶颈和分歧时间分析来研究种群动态，从而调查了该物种的进化历史。我们对来自分布区域各地的31个种群的663个标本进行了嵌套分支系统地理学分析。与之前的研究不同，我们发现雅罗鱼目前由属于两个分支的五个谱系组成（两两分歧率为6.3%）。上新世和更新世古气候事件导致的复杂生物地理模式解释了这些谱系之间的关系，证实了西欧淡水鱼新冰川避难所的存在。最后，我们证明了雅罗鱼和圆腹雅罗鱼之间存在杂交。
