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Каталог книг и продолжающихся изданий библиотеки Института биофизики СО РАН (3)

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolmakov V.I., Gaevskii N.A., Ivanova E.A., Dubovskaya O.P., Gribovskaya I.V., Kravchuk E.S.
Заглавие : Comparative analysis of ecophysiological characteristics of Stephanodiscus hantzschii Grun. in the periods of its bloom in recreational water bodies
Место публикации : Russian Journal of Ecology. - 2002. - Vol. 33, Is. 2. - С. 97-103. - ISSN 10674136 (ISSN) , DOI 10.1023/A:1014448707663
Ключевые слова (''Своб.индексиров.''): chlorophyll a--efficiency in using photosynthetically active radiation--stephanodiscus hantzschii grun.--algal bloom--comparative study--ecophysiology--photosynthetically active radiation--stephanodiscus hantzschii
Аннотация: In the periods of summer and autumn bloom of the Stephanodiscus hantzschii Crun. in recreational water bodies, studies on the vertical distribution of chlorophyll a, its contents per unit biomass, efficiency in using photosynthetically active radiation (EPhAR), and assimilative activity of microalgae were performed. The results confirmed the existence of two ecophysiological forms of St. hantzschii and provided evidence that both forms are typically autotrophic and can efficiently use low-intensity PhAR for photosynthesis.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rogozin D.Y., Zykov V.V., Degermendzhi A.G.
Заглавие : Ecology of purple sulfur bacteria in the highly stratified meromictic Lake Shunet (Siberia, Khakassia) in 2002-2009
Место публикации : Microbiology (Russian Federation). - 2012. - Vol. 81, Is. 6. - С. 727-735. - ISSN 00262617 (ISSN) , DOI 10.1134/S0026261712060148
Ключевые слова (''Своб.индексиров.''): bacteriochlorophyll a--chemocline--meromictic lake--purple sulfur bacteria--seasonal dynamics--bacteria (microorganisms)--chromatiaceae
Аннотация: Phototrophic sulfur bacteria form dense accumulations in the chemocline zones of stratified lakes where light reaches the sulfide-containing layers of water. Many works are dedicated to the ecophysiology of these microorganisms in meromictic lakes. However, the role of these microorganisms in the trophic network of these ecosystems, the ways of biomass utilization, and the contribution to the turnover of biogenic elements have so far been insufficiently understood. This work deals with the analysis of many years' seasonal dynamics of the biomass of purple sulfur bacteria and the physicochemical conditions of their environment in Lake Shunet (Siberia, Khakassia, Russia), unraveling the causes of their anomalous development in the chemocline of this lake, as well as the comparative analysis of such type of ecosystems. Lake Shunet is characterized by markedly pronounced stratification and the high density of purple sulfur bacteria (PSB) in the chemocline, which is comparable to that of Lake Mahoney (Canada) where the number of PSB is the greatest among those known in the world. It was shown that, in the period 2002-2009, the total amount of bacterio-chlorophyll a in the water column of Lake Shunet increased and did not correlate with the seasonal variations in temperature and illumination in the chemocline. It was established that PSB cells in the purple layer experienced the effect of self-shading. The sedimentation rate of purple sulfur bacteria in Lake Shunet was low due to the pronounced density gradient in the chemocline zone. Thus, the high number of PSB in the chemocline was due to the combination of strong illumination, a high sulfide concentration, and a high water density gradient, which was responsible for stable stratification and contributed to the accumulation of the cells in a narrow layer. The data obtained could be useful for the paleoreconstruction of climatically deter-mined changes in the level of the lake and its periods of meromixis by the presence of carotenoids and bacte-riochlorophylls in the bottom sediments. В© 2012 Pleiades Publishing, Ltd.
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