Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in European waters
Barriers in the pelagic: population structuring of Calanus helgolandicus and C. euxinus in European waters
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中上层的障碍：欧洲水域中的 Calanus helgolandicus 和 C. euxinus 的种群结构
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
K. Peijnenburg
中科院分区：
文献类型：
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作者：
L. Yebra;D. Bonnet;R. Harris;P. Lindeque;K. Peijnenburg
海洋浮游生物的分子研究表明，生态和/或环境障碍在分离种群方面起着重要作用。鱿鱼类桡足类动物是海洋生态系统的核心，近年来气候变暖导致桡足类动物群落发生了巨大的生物地理变化。基于遗传特征和形态计量学特征，研究了黑海Calanus helgolandicus及其姊妹种C. euxi nus在大西洋和地中海欧洲水域的空间种群结构。目的是确定扩散的障碍，将这些障碍与水文特征联系起来，并推断分布和人口的历史模式。我们分析了线粒体16S基因的408 bp片段（316个个体），蛋白质与尿体的长度关系（212个个体）以及从19个欧洲地点获得的海面温度。样本间遗传分化的估计和分子变异的层次分析表明，流域之间和流域内部具有很强的空间种群结构。我们确定了7个系统地理类群：峡湾、海洋流入、东北大西洋/第勒尼安、亚得里亚海、Mljet岛、爱琴海和黑海，这些类群解释了总遗传变异的39.7%。基于遗传数据，由于地中海西部种群和地中海东部种群之间存在着最重要的遗传屏障，因此我们认为黄颡鱼是黄颡鱼分布范围内的一个分化种群。形态障碍主要反映海表温度障碍，与主要的遗传障碍不一致。与最近对C. finmarchicus的研究结果相反，我们认为C. helgolandicus/C。易受过去气候变化的影响，易受高度分散的影响。
Molecular studies of marine plankton have shown that ecological and/or environmental barriers play an important role in separating populations. Calanoid copepods are central in marine ecosystems, and dramatic biogeographical shifts in copepod assemblages associated with recent climate warming have been reported. We examined spatial population structuring in European waters of the Atlantic Ocean and Mediterranean Sea of Calanus helgolandicus and its sister species, C. euxi nus, from the Black Sea based on genetic and morphometric characters. The aims were to identify barriers to dispersal, relate these to hydrographic characteristics and infer historical patterns of distribution and demography. We analysed a 408 bp fragment of the mitochondrial 16S gene (316 individuals), prosome to urosome length relationships (212 individuals) and sea surface temp - eratures obtained from 19 European sites. Estimates of genetic differentiation between samples and hierarchical analyses of molecular variance indicated strong spatial population structuring between, as well as within, basins. We identified 7 phylogeographic groups: Fjords, Oceanic inflow, NE Atlantic/ Tyrrhenian, Adriatic, Mljet Island, Aegean, and Black Sea, which explained 39.7% of the total genetic variation. Based on genetic data, C. euxinus is considered to be a differentiated popula- tion within the C. helgolandicus distribution range because the most important genetic barrier sepa- rates western and eastern Mediterranean populations. Morphometric barriers largely reflect sea sur- face temperature barriers and are not congruent with the main genetic barriers. Contrary to recent findings for C. finmarchicus, we conclude that C. helgolandicus/C. euxinus populations are not con- nected by high levels of dispersal and have been vulnerable to past climatic changes.
影响因子：
3.3
作者：
Yunxin Fu
通讯作者：
Yunxin Fu