Abstract
The structure of the psammic rotifer community in three ecotonal zones (arenal, interface, eulittoral) of a mesotrophic lake (Lake Piaseczno; Leczna — Wlodawa Lakeland, eastern Poland) was studied in June and September of 1996 and 1997. A total number of 48 taxa, belonging to three different groups of psammon (eupsammon, hygropsammon and hydropsammon), were identified: 6 psammobionts, 16 psammophiles and 26 psammoxens. In each ecotonal zone, rotifers were clearly differentiated both qualitatively and quantitatively, depending upon the season and chemical factors. For instance, species diversity indicates a positive correlation with three chemical parameters: pH, chemical oxidation demand and PO 4 3− concentration.
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