VAC 03.03.00 Физиология
UDK 57 Биологические науки
Data on the number, biomass and phytoplankton dominant species of the sapropel shallow-water high-trophic Nero Lake (Russia, Yaroslavl region, 57°06′–57°12′ N, 39°21′–39°30′ E) in June and August 2017 are presented. Spatial heterogeneity of phytoplankton were studied in the lake. Comparison of the obtained data with the results of the previous study period up to 2012, and statistical analysis of the relationship of phytoplankton number and biomass with some hydrophysical and hydrochemical parameters were carried out. According to the average phytoplankton biomass (16.6±1.7 g/m3), the lake ecosystem was in the late of eutrophication stage, i.e. at the end of the eutrophy or the beginning of hypertrophy. The lowest biomass (0.7 g/m3 in June and 2.3 g/m3 in August) was observed in the zone of macrophyte thickets. The maximum biomass (22 g/m3 in June and 32 g/m3 in August) was observed near the Rostov city. These biomass values in 2017 are close to those obtained during high-water phase in 2012. Against the background of a decrease in the maximum values of the total phytoplankton biomass in 2017, dominant complex was still formed by shade-tolerant filamentous nonheterocystous cyanobacteria of the “S”-type group. In June, the main dominant complex consisted of cyanobacteria Limnothrix redekei (Van Goor) Meffert, Pseudanabaena limnetica (Lemm.) Komárek, and Aphanizomennon gracile (Lemm.) Lemm. In August, they were joined by Limnothrix planctonica (Wołosz.) Meffert, Planktolyngbya limnetica (Lemm.) Kom.-Legn. et Cronb, Aphanocapsa holsatica (Lemm.) Cronb. et Komárek, Microcystis aeruginosa (Kütz.) Kütz. and M. wesenbergii (Kom.) Kom.. Compared with previous studies, a decrease in the abundance of the cyanobacteria Planktothrix agardhii (Gom.) Anag. et Komárek and diatoms Aulacoseira ambigua (Grun.) Sim. and A. granulata (Ehr.) Sim. was established. In Levskii Bay, where the lowest number and biomass of phytoplankton were observed, mixotrophic phytoflagellates (cryptophytes) dominated. A multifactorial limitation of the phytoplankton development in summer, including nitrogen, sulfates and chlorides, was established.
Lake Nero, phytoplankton, dominant species, abundance, biomass, abiotic factors, eutrophication
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