Evidence for a role of bathymetry and emergence in speciation in the genus Glycera (Glyceridae, Polychaeta) from the deep Eastern Weddell Sea
Evidence for a role of bathymetry and emergence in speciation in the genus Glycera (Glyceridae, Polychaeta) from the deep Eastern Weddell Sea
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DOI：
10.1007/s00300-010-0913-x
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发表时间：
2011-04-01
期刊：
影响因子：
1.7
通讯作者：
Schueller, Myriam
中科院分区：
文献类型：
--
作者：
Schueller, Myriam
南大洋的多毛类通常被认为在水平和垂直尺度上具有广泛的分布范围。在这里，这一理论是测试标本通常被确定为广泛分布的甘油酯Glycera kerguelensis使用两个分子标记，线粒体细胞色素氧化酶C亚基I（COI）和核28 S rDNA。比较了来自三个不同生境和两个深度带（深海平原5 300米、大陆坡2 000米、海山高原2 000米）的三个“种群”的相同形态种。高的遗传距离表明存在三个分支代表不同的物种，确定调查的标本作为一个复杂的神秘物种与垂直限制分布。在2,000米深的阿特卡湾斜坡上发现了两个同域的分支，其中一个分支也在海洋山脉Maud Rise的高原上发现了类似的深度。第三个分支仅限于深海平原（5 300米），表明深度在分支分布中的重要作用，可能与主流海流系统有关。不同分支的进化被认为是由于一个单一的出现事件与分支的起源躺在深渊。
Polychaetes in the Southern Ocean are often thought to have wide distribution ranges on a horizontal and vertical scale. Here, this theory is tested for specimens commonly identified as the widely distributed glycerid Glycera kerguelensis using two molecular markers, the mitochondrial cytochrome oxidase c subunit I (COI) and the nuclear 28S rDNA. Identical morphospecies of three "populations" from three different habitats and two depth zones (abyssal plain 5,300 m, continental slope 2,000 m, sea mountain plateau 2,000 m) are compared. High genetic distances suggest the existence of three clades representing distinct species, identifying the investigated specimens as a complex comprising cryptic species with vertically restricted distribution. Two clades were found in sympatry on the Atka Bay slope in 2,000 m depth, one of these also found in similar depth on the plateau of the sea mountain Maud Rise. The third clade was limited to the abyssal plains (5,300 m) indicating the strong role of depth in the distribution of clades, possibly in conjunction with prevailing current systems. Evolution of the different clades is suggested to have resulted from a single emergence event with the origin of clades lying in the abyss.