Abstract
The data of cobalt and copper effect on the development of Kamchatka brown alga Fucus distichus subsp. evanescens is presented in the paper. The observations were carried out under laboratory conditions with temperature of 10°C, natural light and a photoperiod from July, 6 to August, 6. The cultivation media contained metals at nominal concentrations of 5, 10, 20, and 50 µg/l. It was found that Co addition to the medium mostly stimulated germlings growth. The average growth rate varied from 15.6 to 23.5 µm/day during entire experiment period but did not exceed 16.1 µm/day in the control group. On the contrary, a significant decrease of growth in groups grown in excessive copper media was revealed. By the end of the experiment the rate of germlings growth in media with copper of 10, 20, and 50 µg/l did not exceed 6 µm/day; in the media with minimum metal content was 11.2 µm/day. Also the abnormal formation of germlings rhizoids, the presence of extra- and intracellular copper deposits and underdevelopment of hyaline hairs were observed in all cultures with excessive copper content. The obtained results can be used to predict the responses of Fucus littoral communities to cobalt and copper environment pollution.
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