Composition, seasonal dynamics and feeding groups of ciliated protozoa in the pelagial of the Morava river
2002
Balazi, P. (Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Molecular Biology) | Matis, D.
During 1999-2000 the population structure and seasonal dynamics of pelagic ciliated protozoa were investigated in the Morava river. Samples were taken at Devin (17 degree E, 42 degree N, 0.4 rkm). From 18 samples 76 species of ciliated protozoa were identified. Euplanktonic species were numerous, predominantly Codonella cratera, Phascolodon vorticella, Tintinnidium spp., Vorticella mayeri and Vorticella natans. These species represented more than 23% of all species in the spring months. It is interesting that in the summer months the populations of Suctoria, mainly the Acineta flava and Heliophrya minima, were present frequently. Few species and individuals were found in summer (July), with the maximum numbers and biomass in spring (May). The average species number was 15, the individual number ranging between 78 and 460 per litre. The higher values of the biomass in the spring and autumn months directly depended on the presence of larger species (e.g. Stentor roeselii). The representation of single feeding groups of ciliated protozoa increased as follows: carnivores (1%), algi-bacteriovores (8%), algivores (8%) bacteriovores (38%) and omnivores (45%)
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