Ref ID : 1440

Juta Haberman; Dominant rotifers of Vortsjarv (Estonia). Hydrobiologia 313/314:313-317, 1995

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Rotifers form 71% of the zooplankton of the strongly eutrophic (Total-N 2 g/m3, Total-P 53 mg/m3) Vortsjarv (Estonia). Although 150 taxa of rotifers occur. Species characteristics of oligo-and mesotrophic waters have totally disappeared during the last 30 years, or are disappearing now. Species whose numbers and biomass reached 20% or more of total zooplankton were considered dominants. These were Anuraeopsis fissa, Keratella cochlearis, K. quadrata frezeli, Polyarthra dolichoptera, P. luminosa, Synchaeta verrucosa and Trichocerca rousseleti. The contribution of dominant rotifers to total zooplankton and its biomass is as follows: S. verrucosa 25% and 39%, P. dolichoptera 34% and 25%, K. cochlearis 25% and 7%, K. quadrata frenzeli 9% and 7%, A. fissa 28% and 0.4%, T. rousseleti 20% and 0.6%, respectively.