The composition of dominant species and the structure of phytoplankton communities in small water bodies with algal 'bloom' in the south of the forest-steppe of Volga region

O.G. Gorokhova

Institute of Ecology of the Volga River Basin, Russian Academy of Sciences, Togliatti, 445003 Russia

E-mail: o.gorokhova@yandex.ru

Received March 27, 2017

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Abstract

The species composition, biomass, and structure of phytoplankton communities in small eutrophic reservoirs with algal “bloom” have been studied. “Water bloom” in the studied water bodies is caused by widespread species belonging to the taxa Chlorophyta and Cyanoprokaryota. The highest biomass is characteristic for Phytoflagellata and Cyanoprokaryota species. The most significant changes in the structure of phytoplankton communities are associated with the dominance of Cyanoprokaryota. During the period of dominance of Planktothrix agardhii, the growth of other species and the general species diversity gets reduced. In one of the water bodies, the considerable changes in the structure of phytoplankton communities are associated with the pH value.

Keywords: small eutrophic water bodies, “water bloom”, structure of phytoplankton communities, biomass of species

Figure Captions

Fig. 1. The taxonomic composition of algae causing “water bloom” (I) and their ratio (II) in the studied water bodies.

Fig. 2. Changes in the biomass of phytoplankton, biomass of dominant species, and biocenotic indices in the algal communities of two ponds with the dominance of P. agardhii. Designations: Pl. agard. – Planktothrix agardhii; Sp. renif. – Sphaerospermopsis reniformis; Cryp. er. – Cryptomonas erosa; Cer. hir. – Ceratium  hirundinella; Hs – Shannon index (based on biomass), E – Pielou index.

Fig. 3. Changes in the biomass of phytoplankton, biomass of dominant species, and biocenotic indices in the algal communities of the open-cut water bodies (a, b) and karst lake (c). Designations: Botr. br. – Botryocccus braunii; Sc. acut. – Scenedesmus acutiformis; West. botr. – Westella botryoides; Gon. pect. – Gonium pectorale; Ps. pet. – Pseudocarteria peterhofiensis; Cryp. cur. – Cryptomonas curvata; Chl. rein. – Chlamydomonas reinchardtii; Shannon index (based on biomass), E – Pielou index.

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For citation: Gorokhova O.G. The composition of dominant species and the structure of phytoplankton communities in small water bodies with algal “bloom” in the south of the forest-steppe of Volga region. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2018, vol. 160, no. 2, pp. 276–291. (In Russian)

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