Changes in Size-Morphological Structure of Bacterioplankton in Freshwater Environments of Svalbard

摘要

The abundance, biomass, and size-morphological structure of heterotrophic bacterioplankton have been determined in freshwater environments of the Svalbard archipelago (Norway) differing in morphometry and trophic level. The quantitative parameters of bacterioplankton vary within wide limits and increase along the trophic gradient of the waters. Medium-sized cocci and coccobacilli reach up to one-third of the total abundance and half of the total biomass of bacterioplankton. The abundance and biomass of small cocci vary over a wide range, while small rods are, on the contrary, relatively stable in these parameters. With an increase in trophic status, the proportion of small cocci in the community increases, while the proportion of rods and vibrios decreases. The proportion of medium-sized cocci and coccobacilli change less, although there is a tendency for its increase in the trophic gradient.