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Summer blooms in the Baltic Sea are dominated by the diazotrophic cyanobacteria Nodularia spumigena and Aphanizomenon sp. During the blooms, N. spumigena is concentrated to the water surface and exposed to high irradiances of both photosynthetic active radiation (PAR, 400–700nm) and ultraviolet radiation (UVR, 280–400nm), in addition, this organism is exposed to seasonal changes in nutrient conditions...
Floating and nodularin-producing strains of Nodularia spumigena from the Baltic Sea are regarded as belonging to one species. However, intraspecific variation in the response of N. spumigena to environmental factors has been commonly overlooked. As blooms of N. spumigena occur in late summer, a period with strong light and stable water-column stratification, the cells can be expected to also be exposed...
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