Jolly M T, Viard F, Gentil F, Thiébaut E, Jollivet D
The Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, The Hoe, Plymouth PL1 2PB, UK.
Mol Ecol. 2006 Jun;15(7):1841-55. doi: 10.1111/j.1365-294X.2006.02910.x.
The historic processes which have led to the present-day patterns of genetic structure in the marine coastal fauna of the Northeast Atlantic are still poorly understood. While tectonic uplifts and changes in sea level may have caused large-scale vicariance, warmer conditions during glacial maxima may have allowed pockets of diversity to persist to a much wider extent than in the Northwestern Atlantic. The large-scale geographic distribution of deeply divergent lineages of the coastal polychaete tubeworms Pectinaria koreni (two clades) and Owenia fusiformis (three clades) were compared using a fragment of the mitochondrial cytochrome oxidase I gene (mtCOI). All lineages were present along the biogeographic transition zone on the north coast of Brittany (France) and we found evidence pointing towards congruence in the timing of cladogenic events between Pectinaria sp. (P. auricoma/P. belgica and P. koreni) and Owenia sp., suggesting a shared history of vicariant events. More conserved 16SrRNA sequences obtained from four species of Pectinariidae together with mtCOI sequences of P. koreni seem consistent with an initial establishment of pectinariids in the north, and a southward colonization of the Northeast Atlantic. Phylogeographic patterns in O. fusiformis were also consistent with a north/south pattern of lineage splitting and congruent levels of divergence were detected between lineages of both species. We observed signatures of both persistence in small northern glacial refugia, and of northwards range expansion from regions situated closer to the Mediterranean. However, whether the recolonization of the Northeast Atlantic by both species actually reflects separate interglacial periods is unclear with regards to the lack of molecular clock calibration in coastal polychaete species.
导致东北大西洋海洋沿岸动物群目前遗传结构模式的历史过程仍未得到充分理解。虽然构造隆升和海平面变化可能导致了大规模的地理隔离，但在末次盛冰期温暖的条件下，多样性的小区域可能比西北大西洋持续存在的范围更广。利用线粒体细胞色素氧化酶I基因（mtCOI）的一个片段，比较了沿海多毛纲管栖蠕虫柯氏海毛虫（两个分支）和纺锤欧文蚓（三个分支）深度分化谱系的大规模地理分布。所有谱系都出现在布列塔尼（法国）北海岸的生物地理过渡带，我们发现证据表明海毛虫属（耳状海毛虫/比利时海毛虫和柯氏海毛虫）和欧文蚓属之间的分支形成事件时间一致，这表明存在共同的地理隔离事件历史。从四种海毛虫科物种获得的更保守的16SrRNA序列以及柯氏海毛虫的mtCOI序列似乎与海毛虫科最初在北方建立，并向东北大西洋南部殖民的情况一致。纺锤欧文蚓的系统地理学模式也与谱系分裂的南北模式一致，并且在两个物种的谱系之间检测到了一致的分化水平。我们观察到了在北方小冰川避难所持续存在的特征，以及从更靠近地中海的地区向北范围扩张的特征。然而，由于沿海多毛纲物种缺乏分子钟校准，这两个物种对东北大西洋的重新定殖是否实际上反映了不同的间冰期尚不清楚。
