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The interactions between bacteria and heterotrophic protists are essential for the ecosystem ecology of peatlands. We tested the hypothesis that fertility of a habitat may significantly influence the diurnal dynamics of the abundance of individual components of the microbial loop, as well as the number and intensity of correlations between bacteria and heterotrophic protists. Samples were taken in raised and carbonate peat bogs in three seasons, four times a day: at dawn, at noon, at dusk and at night. The results indicate that microbial community responses to physical and chemical parameters are complex but dependent on peatlands’ type and variable among microbes. Concentrations of nutrients may significantly influence the diurnal dynamics of the microbial communities. The most significant correlations occurred in the afternoon. At that time, the number and biomass of metabolically active bacteria correlated to the highest degree with concentrations of dissolved organic carbon, while in the evening, a clearly positive correlation between the abundance of bacteria and protists was observed. In a carbonate fen, the correlations were significantly weaker. Such knowledge will provide a more comprehensive understanding of the implication of chemical disturbance on microbial functions in relation with nutrient and carbon dynamics.

Diurnal dynamics of the microbial loop in peatlands: structure, function and relationship to environmental parameters