Biocénose pélagique du lac oligomésotrophe de Poméranie (Pologne) : étude des communautés de la boucle mocrobienne et du pytoplancton (original) (raw)

2005, Journal of Water Science

This study présents results of investigations on abundance and biomass of the main communities of the microbial loop (heterotrophic bacteria, autotrophic picoplankton, heterotrophic flagellâtes, ciliated protozoa) as well as nanoand microalgae in the large (525 ha) and deep (48 m) oligo-mesotrophic lake Bobiçcinskie Wielkie located in West Pomerania, Poland. Samples were taken from the pelagial zone in 1996. Within organisms of picoplankton size the heterotrophic bacteria were the most abundant trophic group. Their biomass, together with the much lower abundant autotrophic picoplankton (3.5 to 5.4 ug-C-L"" 1), constituted 15% to 22% of the total microbial biomass. The sum of biomasses of heterotrophic flagellâtes and ciliated protozoa was similar at ail depth (3.0-3.8 ug-C-L" 1), ranging between 8-24% of total biomass. Phytoplankton organisms larger than 2.0 um represented the biggest part of the total microbial biomass, Le. from 50% to 78% (8.4-27.5 ug-C-L-1). The microplankton constitutes the largest part of the phytoplanktonic biomass. Whereas the diatoms and cryptomonads were the most abundant in the upper layers of the lake. The filamentous cyanobacteria of the genus Planktothrix dominated in the deeper waters.

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