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Hydrobiological Journal
SJR: 0.227 SNIP: 0.575 CiteScore™: 0.24

ISSN Print: 0018-8166
ISSN Online: 1943-5991

Hydrobiological Journal

DOI: 10.1615/HydrobJ.v53.i4.20
pages 22-35

Phytomicrobenthos of Brackishwater Bays of the Kiliya Delta of the Danube River

E. Sh. Koziychuk
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine
V. I. Shcherbak
Institute of Hydrobiology, NAS of Ukraine, 12 Geroev Stalingrada Pr., Kiev 0210, Ukraine

ABSTRACT

Results of the study of phytomicrobenthos in water bodies differing in their salinity (from 2.00 to 12.00‰) are given in the paper. In brackishwater bays of the Kiliya delta of the Danube River, relationship was established between the intensity of benthic microalgae development and water salinity: 2.00–5.00, 6.00–8.00, and 9.00–12.00‰. At water salinity of 2.00–5.00‰, species richness, numbers, and biomass of phytomicrobenthos increased at the expense of the development of freshwater oligohalobes, whereas the content of brackishwater mesohalobes decreased. The increase in water salinity to 9.00–12.00‰ was accompanied by the increase in phytomicrobenthos species richness, numbers, and biomass at the expense of the development of its brackishwater and marine forms. In this case, the contribution of freshwater oligohalobes was rather low. At water salinity of 6.00–8.00‰, the intensity of phytomicrobenthos development and its species richness were minimal probably as a result of the influence of the zone of "critical salinity" on benthic microalgae. Both freshwater and brackishwater forms of phytomicrobenthos were found.