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首页> 外文期刊>Marine biology >Population Structure Of The Planktonic Copepod Calanus Pacificus In The North Pacific Ocean
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Population Structure Of The Planktonic Copepod Calanus Pacificus In The North Pacific Ocean

机译：北太平洋浮游Co足类Calanus Pacificus的种群结构

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The pelagic copepod Calanus pacificus ranges nearly continuously across temperate-boreal regions of the North Pacific Ocean and is currently divided into three subspecies-C. pacificus oceanicus, C. pacificus californi-cus, C. pacificus pacificus-based on subtle morphological differences and geographic location. The relation between geography and genetic differentiation was examined for 398 C. pacificus individuals sampled from six widely distributed locations across the North Pacific, including an open ocean site and coastal sites on both sides of the North Pacific basin. For each individual copepod, the DNA sequence was determined for a 421-bp region of the mito-chondrial coxI gene (mtCOI). A total of sixty-three different mtCOI sequences, or haplotypes, were detected, with a sequence divergence between haplotypes of 0.2-3.1%. The number and distribution of haplotypes varied with sampling location; 12 haplotypes were distributed across multiple sampling locations, and 51 occurred at only one location. Five genetically distinct populations were detected based on F_(ST) values. Haplotype minimum spanning networks, nucleotide divergence and F_(ST) values indicated that individuals from coastal sites in the North Pacific Ocean were more closely related to each other than to individuals from the open ocean site at Station P. These results provide genetic support for the designation of two subspecies-a coastal subspecies that consists of what is currently referred to as C. p. pacificus and C. p. californicus and an open ocean subspecies C. p. oceanicus. This work also indicates that planktonic copepods with potentially high dispersal capacity can develop genetically structured populations in the absence of obvious geographic barriers between proximate locales within an ocean basin.
机译：中上层pe足类Calanus pacificus几乎连续分布在北太平洋的温带-北冰洋地区，目前分为三个亚种-C。 pacificus oceanicus，C。pacificus californicus，C。pacificus pacificus-基于细微的形态差异和地理位置。地理和遗传分化之间的关系进行了检查，从整个北太平洋的六个分布广泛的地点取样的398太平洋隐孢子虫个体，包括北太平洋盆地两侧的一个开放的海洋地点和沿海地点。对于每个individual足类动物，确定了线粒体coxI基因（mtCOI）421 bp区域的DNA序列。总共检测到六十三种不同的mtCOI序列或单倍型，单倍型之间的序列差异为0.2-3.1％。单倍型的数量和分布随采样位置而变化； 12个单倍型分布在多个采样位置，其中51个仅发生在一个位置。根据F_（ST）值检测到五个遗传上不同的种群。单倍型最小跨度网络，核苷酸差异和F_（ST）值表明，北太平洋沿岸站点的个体之间的亲缘关系比与P站开放海域的个体之间的亲缘关系更紧密。两个亚种的名称-沿海亚种，由当前称为C. p。的亚种组成。太平洋和C。加利福尼亚州和一个开放海洋亚种。大洋洲。这项工作还表明，具有潜在高扩散能力的浮游co足类动物可以在海盆附近各区域之间没有明显的地理障碍的情况下发展遗传结构种群。

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