Seasonal Variations in Community Structure of Anoxygenic Phototrophic Bacteria From the Meromictic Lake Trekhtsvetnoe (Kandalaksha Bay, White Sea)

Lunina, O.N.; Savvichev, A.S.; Krasnova, E.D.; Kokryatskaya, N.M.; Voronov, D.A.; Letarova, M.A.; Gorlenko, V.M.

Авторы: Lunina O.N., Savvichev A.S., Krasnova E.D., Kokryatskaya N.M., Voronov D.A., Letarova M.A., Gorlenko V.M.
Сборник: MARINE BIOLOGY, GEOLOGY, OCEANOLOGY: INTERDISCIPLINARY RESEARCH AT MARINE STATIONS 80th anniversary of the Nikolai Pertsov White Sea Biological Station, NOVEMBER 19-21, MOSCOW, 2018
Тезисы
Год издания: 2018
Место издания: KMK Scientific Press Ltd Russian Federation
Первая страница: 67
Последняя страница: 68
Аннотация: It is known that in the water chemocline zone of meromictic lakes a microbial community consisting of phototrophic, chemotrophic and heterotrophic microorganisms forms. If in such a community browncolored (b/c) green sulfur bacteria (GSB) present, they usually develop at the lower boundary of the photic area. Since 2012, we studied the microbial community of meromictic Trekhtsvetnoe Lake, which connects with Kandalaksha Bay of the White Sea. First it was shown that in water chemocline zone green-colored (g/c) GSB Chlorobium phaeovibrioides develop. Further studies have shown also b/c GSB in the lake developing, and in summer seasons b/c GSB localize in the upper part of the community above the green water layer. In winter, due to the distance of water chemocline from the ice surface, the lack of surface lighting was limited g/c GSB development, and optimal conditions for b/c GSB in the upper part of the green water layer appeared. However, despite the deep adaptation to extremely low light, the amount of b/c GSB did not reach g/c GSB extent, which was probably due to low rate of b/c GSB growth in low light conditions. After ice melting, g/c cells quickly reached an extremely large number. A dense of green water layer (not less than 2.0–2.3 × 108 cells ml-1) did not pass surface light into the lower horizons, which prevented the development of b/c GSB there. Thus, in the summer b/c GSB locked in extremely adverse conditions between dense layer of g/c GSB and well-lit oxygen layer. There was gradual displacement of b/c cells in the oxygen zone, where they quickly lost viability, being strict anaerobes. Single viable brown cells were preserved inside the high-density green layer, which was confirmed by cultivation of water samples in agar medium.
Добавил в систему: Мардашова Мария Валерьевна

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Seasonal Variations in Community Structure of Anoxygenic Phototrophic Bacteria From the Meromictic Lake Trekhtsvetnoe (Kandalaksha Bay, White Sea)тезисы доклада Тезисы

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