Biochemical composition of dissolved organic carbon derived from phytoplankton and used by heterotrophic bacteria

Article Abstract:

A biochemical analysis was conducted to determine which components of the photosynthetically produced dissolved organic matter (PDOC) derived from phytoplankton are important for pelagic heterotrophic bacteria. Experiments were conducted in three temperate lakes at different times in the phytoplankton growing season using radioactive carbon tracing methods. The results showed that the size distribution and biochemical composition of PDOC released from phytoplankton vary greatly both between lakes and over time within lakes. Heterotrophic bacteria respond by seasonal variation in their efficiency to utilize various types of substrates.

Environmental aspects, Bacteria, Heterotrophic, Heterotrophic bacteria, Phytoplankton, Carbon cycle (Biogeochemistry), Carbon cycle

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Variation in microbial community structure in two boreal peatlands as determined by analysis of phospholipid fatty acid profiles

Article Abstract:

Phospholipid fatty acids (PLFAs) were utilized to determine variation in community structure and total microbial biomass in two boreal peatlands in Sweden. The total PLFA concentration in peat varied from 0.16 to 7.0 nmol g of wet peat(super -1). Findings showed that the degree of depth-related variation in PLFA composition was high among peatland habitats, with general differences between wet sites, with water tables within a few centimeters of the moss surface, and dry sites, with water tables more than 10 cm under the moss surface.

Analysis, Fatty acids, Peat

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Bacterial population dynamics in a meromictic lake

Article Abstract:

Polyclonal antibodies against nine different bacteria extracted from Lake Saelenvannet in western Norway were produced and the population dynamics of these strains in the lake were observed for two spring seasons. The total number of bacteria varied over time and space from 1.5 X 10(super 6) to 1.5 X 10(super 7) cells/ml. The average virus-to-bacteria ratio was 50 and there was significant correlation between the abundances of virus and bacteria.

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