INTERANNUAL VARIATION OF ROTIFER BIOMASS IN 2 COASTAL LAGOONS OF THE SOUTHERN BALTIC DIFFERING BY DEGREE OF TROPHY

We present long-term data on rotifer biomass and its inter-annual vari ation in the Darss-Zingst estuary and the Vistula Lagoon, South Baltic Sea coast. The two water bodies showed a similar pattern with respect to the dominance structure of the rotifer community, though in the mo re eutrophic Darss-Zingst estuary there was always a more pronounced s ummer peak. It was also concluded that there was no simple coincidence between variation patterns of rotifer biomass and such environmental factors as water temperature and salinity, and that a more complex exp lanation for these variations should be sought.