Butyric acid bacteria of the genus Clostridium in the bottom sediments of inland basins of different types
Tóm tắt
The cell numbers and ecological characteristics of the distribution of certain species of butyric acid bacteria (BABs) of the genus Clostridium in the bottom sediments of inland basins of different types were studied using the optimal nutrient media. The seasonal dynamics of clostridial vegetative cells and spores in sediments with different ecological conditions were revealed. The cell numbers of the dominant BAB species were shown to depend on the redox potential of the sediments, the amount and composition of Corg, and the trophic state of the basin in general. C. pasteurianum was found to predominate in eutrophic lakes and reservoirs (5–11 × 106 cells/cm3), C. butyricum and C. felsineum predominated in mesotrophic ones (2–11 × 106 cells/cm3), and C. acetobutylicum was predominant in acidic chthonioeutrophic lakes and reservoirs (0.1–0.5 × 106 cells/cm3). The lowest cell numbers of BABs were found in river sediments, whereas the highest numbers were recorded in the sediments of polysaprobic zones (0.1–1.0 × 103 and 0.5–2.0 × 107 cells/cm3 respectively).
Tài liệu tham khảo
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