Economitoring of annual dynamics of composition and periphyton biomass of the coastal shallows of the Sevastopol region

N.A. Andreeva

 Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

Е-mail: andreeva.54@list.ru

DOI: 10.33075/2220-5861-2020-2-102-107

UDC 574.586:581.5                                                    

Abstract:

   At present, studying the biodiversity of periphyton communities is one of the main research priorities in biology and biogeography, since it can be rather an effective tool for monitoring environmental quality. This paper presents the results of a study of periphyton communities on fouling glasses in the coastal waters of one of the bays of the Sevastopol region. During 2017‒2019, 38 forms of microalgae and cyanobacteria were identified and the frequency of their occurrence and dominant forms in these communities were determined. Absolute dominants (with a frequency of occurrence of 100%) in 2017 were diatoms of the genus Pinnularia and green filamentous forms. In 2018, the diatom genera Amphora, Licmophora, Navicula, Nizschia, and cyanobacteria of the genus Spirulina supplemented the list of dominant forms. In 2019, diatoms Navicula, Pinnularia, Licmophora, green filamentous forms and cyanobacteria of the order Oscillatoriales were in the lead. The occurrence of microalgae and cyanobacteria varied by month during each year. It was revealed that the number of forms simultaneously present in periphyton samples in the period of 3 years ranged from 9 to 18, from 18 to 24, and from 17 to 26 units/cm2 in 2017, 2018, and 2019, respectively. As in the entire Black Sea ecosystem, diatoms and cyanobacteria are widespread in periphyton. The effect of temperature on the accumulation of periphyton biomass was shown. The annual variation of this indicator did not depend on the number of forms that make up the fouling, but could be related to the size and morphological features of the fouling. There was a tendency towards an increase in algological diversity and biomass in the warm season, with the maximum amount of the latter indicator observed about a month after the temperature maximum.

Keywords: periphyton communities, the Black Sea, fouling glasses, microalgae, cyanobacteria, fouling biomass.

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