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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Authors: | Griet Casteleyn Katharine M Evans Thierry Backeljau Sofie D’hondt Victor A Chepurnov Koen Sabbe Wim Vyverman |
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Institution: | (1) Laboratory of Protistology and Aquatic Ecology, Biology Department, Ghent University, Krijgslaan 281-S8, 9000 Ghent, Belgium;(2) Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, UK;(3) Royal Belgian Institute of Natural Sciences, Vautierstraat 29, 1000 Brussels, Belgium;(4) Evolutionary Ecology Group, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;(5) SBAE Industries NV, Oostmoer 22A, 9950 Waarschoot, Belgium |
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Abstract: | 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.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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