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首页> 外文期刊>Marine biology >Population genetic structure of the prosobranch Nassarius reticulatus (L.) in a ria seascape (NW Iberian Peninsula) as revealed by RAPD analysis
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Population genetic structure of the prosobranch Nassarius reticulatus (L.) in a ria seascape (NW Iberian Peninsula) as revealed by RAPD analysis

机译：RAPD分析揭示的ria海景（西北伊比利亚半岛）前鼻nch（Nassarius reticulatus（L.））的种群遗传结构

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摘要

Randomly amplified polymorphic DNA (RAPD) banding patterns were compared between samples of the netted dogwhelk Nassarius reticulatus from 11 locations along the NW Iberian Peninsula coast. To detect if rias (estuaries formed by drowned river valleys) might promote genetic differentiation, five sampling sites were located within a ria (ria of Muros) and the remaining six were scattered along open-coast areas at increasing distances from the ria mouth. Population differentiation statistics (Φ-values) were estimated using a hierarchical analysis of molecular variance (AMOVA) with samples sorted into two groups: open-coast and ria populations. Despite a high potential to disperse, AMOVA demonstrated a modest, statistically significant genetic heterogeneity among N. reticulatus populations. Most of the genetic structure resided in differences among open-coast populations; ria populations were genetically homogeneous. No obvious geographical pattern was detected for the pairwise genetic distances (non-metric multidimensional scaling; UPGMA tree; Mantel test). Unlike previous studies with other species at a variety of estuarine systems other than rias, there was no evidence that the ria of Muros may enhance the genetic divergence of N. reticulatus populations. This discrepancy is discussed in relation to the biological features of the species (high dispersal potential and a preference for mid-low estuarine habitat) and the strong hydrographic connectivity between ria and neighbouring off-shore waters.
机译：在西北伊比利亚半岛沿岸11个地点的网状犬w Nassarius reticulatus样本之间比较了随机扩增的多态性DNA（RAPD）谱带模式。为了检测rias（由淹没的河谷形成的河口）是否可以促进遗传分化，在ria（Muros ria）内放置了五个采样点，其余六个采样点分布在离ria口越来越远的沿海地区。使用分子方差分析（AMOVA）对人口分化统计数据（Φ值）进行了估计，并将样本分为两组：沿海人口和ria人口。尽管具有很高的散布潜力，但AMOVA在网纹猪笼草种群中显示出适度的，统计学上显着的遗传异质性。大多数遗传结构存在于沿海人口之间的差异中。里亚族群体在遗传上是同质的。没有发现明显的地理模式的成对遗传距离（非度量多维标度； UPGMA树； Mantel测试）。与先前在除河口之外的多种河口系统中对其他物种的研究不同，没有证据表明穆罗斯岛的河口可能会增加网纹猪笼草种群的遗传差异。关于物种的生物学特征（高扩散潜力和对中低河口栖息地的偏爱）以及ria和邻近的近海水域之间强大的水文连通性进行了讨论。

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