In the spring and summer of 2019, 43 lakes and ponds of Saint Petersburg were surveyed. The algal flora contains 110 species of algae of the following divisions: Cyanophyta =Cyanobacteria=Cyanoprokaryota – 18, Cryptophyta – 1, Dinophyta – 9, Euglenophyta – 11, Chlorophyta – 57 Streptophyta - 2, Ochrophyta (classes Chrysophyceae – 2, Bacillariophyceae – 10). For the majority of the found species, the saprobity mark and saprobic index were specified. The most diverse group in the water bodies of Saint Petersburg is green algae, which includes single and coenobial algae of the coccoid and monad tallom organization, which are well adapted to vegetation in the water column. In most reservoirs at spring Monoraphidium arcuatum (Korshikov) Hindák and Monoraphidium contortum (Thuret) Komárkova-Legnerova, species of genera Scenedesmus, including species of the genera Desmodesmus and Tetradesmus actively vegetate. In the reservoirs of Saint Petersburg, the leading positions are taken by euglenic algae, especially species of genera Trachelomonas (Trachelomonas hispida (Perty) F. Stein, Trachelomonas volvocina (Ehrenberg) Ehrenberg). Summer phytoplankton differs in the more vigorous development of blue-green algae-especially such species as Dolichospermum flosaquae (Brébisson ex Bornet & Flahault) P. Wacklin, L. Hoffmann & Komárek, Dolichospermum spiroides (Klebhan) Wacklin, L. Hoffmann & Komárek. The species of β- mesosaprobic dominate. There are also α-mesosaprobes and species with a wide range of existence in reservoirs with different degrees of organic content. Biological analysis of the surveyed water bodies shows that their condition is satisfactory.
The biological method of water quality analysis, for the first time, was applied in Russia during the examination of Neva Bay of the Gulf of Finland in the Baltic Sea by Wislouch S.M. Neva River was a source of drinking water in St. Petersburg and, at the same time, a discharge for all city drains. As a result, it became hazardous to health, being a source of various diseases, especially cholera. From August 1911 to September 1912 pollution studies of the Bay were made to solve the question - where to send the treated waste water of the future sewage system of St. Petersburg. In total, 37 trips were made during this time, 510 samples were taken, including 375 plankton samples and 35 benthic samples. Wysłouch S. M. gave an overview of objects collected at 265 stations located in the area of Neva Bay - from estuary of Bolshaya Neva to Kronstadt, along the southern coast of the Bay and partially along the Northern coast. He brought a list of algae, including 97 species: Algae Cyanophyceae (writing all taxa retained on original source) – 17 species, Flagellata – 19 species, Peridineae – 1, One – 30, Conjugatae – 2, Diatomaceae – 28 species, Fungi (1), Bacteria (17), Protozoa (28), Rotatoria (17). Taking into account the algae and other organisms saprobity indices, areas with different degrees of contamination were identified. All the data was put on map of the Gulf. The most heavily polluted area was the Sea channel, and the area between the Lisij Nos and Kronstadt was the cleanest.
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