Comparative study on the population genetics of the red algae <Emphasis Type="Italic">Furcellaria lumbricalis</Emphasis> occupying different salinity conditions |
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Authors: | Kirsi?Kostamo Email author" target="_blank">Helena?KorpelainenEmail author Sanna?Olsson |
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Institution: | (1) Department of Agricultural Sciences, University of Helsinki, P.O. Box 27, 00014 Helsinki, Finland;(2) Present address: Finnish Environment Institute, P.O. Box 140, 00251 Helsinki, Finland; |
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Abstract: | Furcellaria lumbricalis is a red algae occurring in low salinity to fully marine conditions. Here, both putatively neutral and EST-derived microsatellite
markers were developed and used to examine the genetic structure of northern European populations inhabiting different salinity
conditions ranging from 35 to 3.6 psu. The amount of genetic variation did not differ between ocean and brackish populations,
but differences were observed between marker types; EST-derived markers possessed less variation and showed greater differentiation
than the putatively neutral microsatellites. No multicopy multilocus genotypes were detected despite expected asexuality in
brackish populations. The Bayesian STRUCTURE analysis, when conducted for expressed marker data, indicated the presence of
two main clusters, the Atlantic Ocean and Baltic Sea, while no clear structuring was observed based on putatively neutral
microsatellites. The moderate level of genetic differentiation at neutral loci is probably due to genetic drift, a feasible
explanation considering long distances between many populations, while the high level of differentiation in EST-linked markers
reflects selection pressures. |
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