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首页> 外文期刊>Marine biology >Phylogeographic patterns of the mysid Mesopodopsis slabberi (Crustacea, Mysida) in Western Europe: evidence for high molecular diversity and cryptic speciation
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Phylogeographic patterns of the mysid Mesopodopsis slabberi (Crustacea, Mysida) in Western Europe: evidence for high molecular diversity and cryptic speciation

机译：西欧象鼻虫（Mesopodopsis slabberi）（甲壳纲，Mysida）的植物志模式：高分子多样性和神秘物种的证据

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摘要

The phylogeographic patterns among populations of Mesopodopsis slabberi (Crustacea, Mysida), an ecological important mysid species of marine and estu-arine habitats, were analysed by means of DNA sequencing of a fragment of the mitochondrial cyto-chrome c oxidase subunit Ⅰ (COI) and the 16S ribosomal RNA genes. Samples of M. slabberi collected from five Atlantic and two Western Mediterranean populations were investigated. Very high levels of within-population molecular diversity were observed in all samples (mean h = 0.807 and π = 0.0083), with exception of the Mediterranean Ebro population which contained only one haplotype. Differentiation among populations was high, and a clear phylogeographic break was observed between the Atlantic and Mediterranean populations. Moreover, a strong differentiation was detected between both populations in the Western Mediterranean Sea (Alicante and Ebro delta), while two divergent lineages occurred in sympatry within the Atlantic Mondego estuary. The high congruence between both the COI and 16S rRNA sequence data, the reciprocal monophyly of the different mitochondrial clades and the levels of nucleotide divergence between them suggest the presence of a complex of cryptic species within M. slabberi. Estimations of divergence time between the different mitochondrial lineages indicate that a split occurred during the late Miocene/early Pliocene. Such a divergence could be concordant with vicariant events during sea-level drops within the Mediterranean region at that time. However, within the Mediterranean Sea, the potential of divergence through ecological diversification cannot be ruled out.
机译：通过对线粒体细胞色素C氧化酶Ⅰ（COI）片段的DNA测序，分析了中生食脚草（甲壳纲，Mysida）的生态系统模式，这是一种重要的海洋和河口栖息地生态上重要的壳类物种。和16S核糖体RNA基因。调查了从五个大西洋和两个西地中海种群中收集的剑柏的样本。在所有样品中均观察到非常高的种群内分子多样性水平（平均值h = 0.807和π= 0.0083），地中海埃布罗族仅包含一种单倍型。种群之间的差异很大，在大西洋和地中海种群之间观察到明显的系统地理学断裂。此外，在西地中海（阿利坎特和埃布罗三角洲）的两个种群之间发现了强烈的区分，而大西洋蒙德戈河口的交界处出现了两个不同的谱系。 COI和16S rRNA序列数据之间的高度一致性，不同线粒体进化枝的相互单向性以及它们之间核苷酸差异的水平表明，在剑柏中存在着一个复杂的隐性物种。不同线粒体谱系之间的发散时间估计表明，在中新世晚期/上新世早期发生了分裂。这种分歧可能与当时地中海地区海平面下降期间的平民事件相一致。但是，在地中海内，不能排除通过生态多样化而产生分歧的可能性。

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