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Role of Nanoplanktons in Marine food-webs

100%

Das N. , Pandey A.

International Letters of Natural Sciences

2015

tom 43

Nanoplanktons are ubiquitous protozoan zooplankton in a size range of 2 to 20 μm, play key ecological roles in aquatic ecosystems. Heterotrophic nanoflagellates are distributed through the continental shelf and margin area of the oceans as well as deep-sea. These organisms contribute significantly to the total living biomass within these systems, serve as the major top–down control on bacterial assemblages, and are an important source of mortality for microalgae and other heterotrophic nanoflagellates. From many recent studies, it is generally accepted that HNF is one of the most important bacterial consumers. They also function as important remineralizers of organic matter and nutrients in aquatic systems. In accordance with these important ecological roles, heterotrophic nanoflagellates have been the subject of considerable study both in the field and laboratory.

Composition of protozoan communities at two sites in the coastal zone of the Southern Baltic Sea

100%

Rychert K. , Spich K. , Laskus K. , Paczkowska M. , Wielgat-Rychert M. , Sojda G.

Oceanological and Hydrobiological Studies

2013

tom 42

nr 3

Protozoans prefer large and metabolically active bacteria

100%

Koton-Czarnecka M. , Chrost R. J.

Polish Journal of Environmental Studies

2003

tom 12

nr 3

The aim of our studies was to verify the hypothesis that heterotrophic nanoflagellates (HNF) prefer large and metabolically active bacterial cells, and avoid small and inactive bacteria. Determined grazing rates on bacteria differing in sizes and metabolic activity and observed changes in bacterioplankton structure in samples with and without bacterial grazers indicated that HNF prefer large (but not too large) and actively metabolizing bacterial cells. Bacterial size fraction between 0.4 and 0.8 μm represented the majority of all grazed bacteria, i.e. 61.6±6.9 %. Grazing rates on live bacteria were 1.83 times greater than grazing rates on dead bacteria. This preferential protozoan feeding strongly affects composition and activity of bacterial communities in aquatic environments.