Ref ID : 3424
R.A. Liepa; [Ecology of free-living ciliates of the Latvian Rivers]. Akademy of Sciences of the USSR Society of Protozoologists of the USSR Series << Protozoology >> 3:58-65, 1978
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Free-living ciliates of the Latvien rivers - Daugava, Lielupe, Rauna, Slocene, Svetupe and their tributaries appear to be taxonomically very different; in all were observed 315 species of ciliates belonging to three orders: Holotricha, Spirotricha, Peritricha. In all the investigated rivers, the variety in species composition increases in summer-autumn period, but the number of population increases in spring-summer time. The maximum density of ciliates population in rivers was observed in polluted regions. The presence of brackish waters of Gulf of Riga, in the estuary region of the Daugava and the Lielupe enriches the species composition with brackish water ciliates. An inflow of sea water at high tide inhibits the development of bottom ciliates of freshwater origin.