Abstract
Nine species of macroalgae collected on the East Murman coast of the Barents Sea were examined: Laminaria saccharina, Alaria esculenta, Saccorhiza dermatodea, Fucus distichus, Fucus serratus, Fucus vesiculosus (Phaeophyta), Palmaria palmata, Porphyra umbilicalis (Rhodophyta) and Ulvaria obscura (Chlorophyta). The samples were kept in three culturing tanks screened to sequester two wavelength ranges of UV radiation. There was a clear seasonal trend in the influence of UV-A, UV-B and of solar radiation without UV-A+B on the growth of the algae. The maximum growth rate was observed in tests with solar radiation excluding UV radiation. A prominent decrease in growth was induced by UV-B in all the species. Ulvaria obscura appeared to be the most sensitive to in situ levels of UV-B radiation, which reduced its growth rate to 54%. The least sensitivity was recorded in Fucus vesiculosus. There was found to be a critical period in May when the algae are affected most by ultraviolet radiation.
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