Terenko G. Contemporary states of the northwestern Black Sea coastal phytoplankton and the role of dinophyte algae in it

In the northwesrtern Black Sea the species diversity, seasonal dynamics, temporal distribution and the inter-annual changes of the qualitative parameters of coastal phytoplankton have been studied on the basis of materials collected in 1995 - 2000 (more than 900 sample). The contribution of dinophyte algae in the plankton community of this region has been evaluated. An increase in the moiety of dinophytes in the total mass up to 48 - 82 % in the spring and autumm has been shown, as well as rise in the contribution of yellow-green algae up to 35 % in the total abundance of phytoplankton in the autumm.297 species and interspecies taxa have been recorded including those containing the nomenilature species phylum (382) belonging to 8 divisions of microalgae. For the first time 20 species and varieties of Bacillariophyta, Dinophyta and Chrysophyta have been noted for this area. For the first time a detailed study of species diversity of dinophyte algae has been made represented by 114 species (124 intraspecies taxa). A new species and a new variety in the science of algology have been described. The eutrophication category of area has been determined. The composition of dominating and subdominating species has been determined and the main seasonal assemblages have been distinguished. In the Odessa Bay 34 cases of "water blooming" caused by 26 species of microalgae have been observed. The amount of "blooming" has decreased two fold and their intensity has declined on a long-term scale while the amount of species causing it has increased. In the past years dinophyte algae with mixotrophic and heterotrophic types of nutrition often develop in coastal marine zone and serve as indicators of organic pollution.