Phylogeographical structure, distribution and genetic variation of the green algae Ulva intestinalis and U. compressa (Chlorophyta) in the Baltic Sea area

Molecular Ecology
E LeskinenP Pamilo

Abstract

The marine algae Ulva intestinalis and U. compressa are morphologically plastic with many overlapping characters and are therefore difficult to distinguish from each other. The present distribution of U. intestinalis and U. compressa is investigated along the salinity gradient in the Baltic Sea area through analyses of internal transcribed spacer (ITS) sequence data. Also, the amount and distribution of intraspecific genetic polymorphism in the ITS region is studied allowing inferences on the phylogeographical pattern and postglacial recolonization of the Baltic Sea area. The data show that of the two species only U. intestinalis occurs in the Baltic Sea. The distribution of U. compressa is more restricted than previously reported, and it was not found in salinities lower than 15 ppt. All of Scandinavia and the Baltic Sea were covered with ice during the last ice age and the organisms in the Baltic Sea must have colonized the area after the ice had started to melt. The genetic diversity of U. intestinalis and U. compressa in the Baltic Sea and the neighbouring area was found to be reduced compared to that in the British Isles. This reduction may be the result of either a historical reduction of diversity or an adaptation of spe...Continue Reading

References

Oct 26, 2000·Molecular Ecology·M ClementK A Crandall
Dec 26, 2001·Bioinformatics·S KumarM Nei
Nov 1, 2002·American Journal of Botany·Jaanika BlomsterMichael J Stanhope
Nov 1, 1984·Evolution; International Journal of Organic Evolution·B S Weir, C Clark Cockerham

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Citations

Nov 12, 2019·Molecular Ecology·Johnette C PetersCeridwen I Fraser
Nov 4, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Joanna Czerwik-MarcinkowskaAnna Wojciechowska

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