Large Differences in the Fraction of Active Bacteria in Plankton, Sediments, and Biofilm

摘要: For many years, the importance of microorganisms attached to surfaces in littoral zones and wetlands has been disregarded when describing aquatic ecosystem dynamics. Supporting evidence is scarce but convincing that these microbial communities are not only very productive can often serve as major regulators nutrient carbon dynamics freshwaters. In order determine quantitative epiphytic bacteria for overall turnover, I compared relative contribution on submerged macrophyte Ranunculus circinatus, sediment free-living total bacterial production. Sediment generally dominated biomass zone. Although R. circinatus was ten times lower than bacteria, it contributed at least equally Thus, results presented this thesis confirm most production shallow lakes associated with surfaces, dense stands, contribute significantly turnover. There increasing all cells natural metabolically active. Lake Erken, there were large differences fraction active between different habitats, while within-habitat small. The sediments had largest fraction, followed by water column a few percent connected environmental fluctuations. hypothesize smaller fluctuations chemical, biological or physical factors result fractions. small within habitat allow fractions, constrained large.