STRUCTURE AND DYNAMICS OF PHYTOPLANKTON IN “KARDZHALI” DAM-LAKE
Keywords:
phytoplankton seasonal dynamics, species composition, quantity, biomass, “Kardzhali” damlakeAbstract
Subject of study were the species composition and seasonal dynamics of phytoplankton in “Kardzhali” damlake. The presence of 67 taxa of 7 divisions was established: Cyanoprokaryota (12), Chlorophyta (21), Streptophyta (7), Pyrrhophyta (2), Euglenophyta (3), Chrysophyta (1) and Bacillariophyta (21). Taxonomic distribution by divisions is as follows: Cyanoprokaryota (17.9%), Chlorophyta (31.3%), Euglenophyta ( 4.4%), Streptophyta (10.4%), Pyrrhophyta (2.9%), Chrysophyta (1.4%) and Bacillariophyta (31.3%). The dominant and subdominant representatives of planktonic algae and their quantitative and seasonal changes were identified. The richest with species and with maximum values for quantity and biomass of phytoplankton are the stations in the lake part of the dam, where net cage farms for rearing carp and sturgeon are situated. The largest number of species were found in June (42), and the lowest in November (25). The average values of the phytoplankton biomass for the studied period determine the mesotrophic status of the Kardzhali” dam-lake.
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