Seasonal dynamics of bacterioplankton community structure in a eutrophic lake as determined by 5S rRNA analysis

Article Abstract:

Community structure of bacterioplankton was investigated during the major growth season for phytoplankton in the epilimnion of a temperate eutrophic lake by employing comparative 5S rRNA analysis. Overall, the whole bacterioplankton community showed two to eight abundant taxa. A rather-stable community structure, with seven to eight different taxonomic units, was seen beginning in April during the spring phytoplankton bloom. A strong reduction in this diversity occurred at the start of the clear-water phase, when only two to four abundant taxa were observed. During late summer, a dinoflagellate bloom occurred, with Comamonas acidovorans becoming the dominant bacterial species.

Lakes, Microbial populations, Phytoplankton

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Bacterioplankton community structure and dynamics after large-scale release of nonindigenous bacteria as revealed by low-molecular-weight-RNA analysis

Article Abstract:

The effects of introducing nonindigenous bacteria and culture medium to the bacterioplankton community of a lake was studied using low-molecular-weight RNA analysis. The addition of Escherichia coli and Pseudomonas putida did not result in a significant alteration in the bacterioplankton community structure. However, the addition of culture media resulted in the upsurge of particular bacterial groups, like Aeromonas hydrophila and a Cytophaga johnsonae johnsonae-like bacterium. These results demonstrate that changes in nutrient supply are more likely to disrupt a natural population profile than the introduction of nonindigenous species of bacteria.

Environmental aspects, Plankton research, Lake ecology

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Flagellate predation on a bacterial model community: interplay of size-selective grazing, specific bacterial cell size, and bacterial community composition

Article Abstract:

Research concerning the influence of flagellate grazing on bacterial model communities in Ochromonas sp. strain DS is conducted. Experiments demonstrate that the size-selective grazing controls the morphological and taxonomic structures of the model community.

Germany, Physiological aspects, Bacteria, Predation (Biology), Flagella (Microbiology), Flagella, Grazing

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