Lack of population genetic structuring in the marine planktonic diatom Pseudo-nitzschia pungens (Bacillariophyceae) in a heterogeneous area in the Southern Bight of the North Sea
Lack of population genetic structuring in the marine planktonic diatom Pseudo-nitzschia pungens (Bacillariophyceae) in a heterogeneous area in the Southern Bight of the North Sea
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DOI：
10.1007/s00227-009-1157-6
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发表时间：
2009-05-01
期刊：
影响因子：
2.4
通讯作者：
Vyverman, Wim
中科院分区：
文献类型：
--
作者：
Casteleyn, Griet;Evans, Katharine M.;Vyverman, Wim
一些海洋全浮游生物表现出高度的地理结构多样性，这种差异在多大程度上是由于存在隐蔽的分类群而往往尚不清楚。为遗传上截然不同的硅藻拟刺菱形藻var.我们利用6个微卫星标记研究了北海非均匀南湾的空间和时间遗传组成。尽管我们的采样区域(约100公里)包括不同环境条件(海洋、河口、盐湖)和不同程度的连通性(从完全隔离到环境之间的自由交换)的水体，但没有发现遗传分化的证据。扩大我们的采样区域(约650公里)，表明在北海更大的区域内存在同质的种群结构。我们的结果表明，即使在连通性有限的水体中，这种硅藻的种群结构也主要是由防止遗传漂移的基因流的强烈同质效应形成的。
Several marine holoplanktonic organisms show a high degree of geographically structured diversity for which it often remains unclear to what extent this differentiation is due to the presence of cryptic taxa. For the genetically distinct diatom Pseudo-nitzschia pungens var. pungens, we used six microsatellite markers to investigate the spatial and temporal genetic composition in the heterogeneous Southern Bight of the North Sea. Although our sampling area (ca. 100 km) comprised water bodies with different environmental conditions (marine, estuary, saline lake) and different degrees of connectivity (from complete isolation to supposedly free exchange between environments), no evidence of genetic differentiation was found. Expanding our sampling area (ca. 650 km), suggested a homogenous population structure over even larger areas in the North Sea. Our results suggest that the population structure of this diatom is mainly shaped by strong homogenizing effects of gene flow preventing genetic drift, even in water bodies with limited connectivity.