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Hydrobiological Journal
SJR: 0.227 SNIP: 0.901 CiteScore™: 0.5

ISSN Imprimer: 0018-8166
ISSN En ligne: 1943-5991

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Hydrobiological Journal

DOI: 10.1615/HydrobJ.v51.i3.30
pages 45-60

Structural and Functional Organization of Phytoplankton in the Thickets and in the Sections Free of Vegetation in the Lakes of Kiev

P. D. Klochenko
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine
T. F. Shevchenko
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine
G. V. Kharchenko
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine

RÉSUMÉ

The species composition, taxonomic structure, and quantitative indices of phytoplankton development, and also its functional activity, were studied in the sections of the lakes significantly differing in the intensity of illumination (in the open sections and in the thickets of higher aquatic plants). It has been found that in the thickets the conditions for the development of plankton algae are unfavorable primarily as a result of a sharp decrease in the intensity of illumination. This resulted in the decrease in the quantitative indices of phytoplankton development (numbers − on the average by a factor of 1.8, whereas biomass − by a factor of 2.4), and also in the decrease in its functional activity. The increase in the number of species and some changes in the taxonomic structure of phytoplankton in the thickets of higher aquatic plants were conditioned by the influx of epiphyton algae occurring in the fouling of higher aquatic plants into water column. Algal species typical to phytoplankton of the thickets were not found.


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