Seasonal dynamics of zooplankton were investigated in three different habitats of the shallow and temperate Kačležský pond (Czech Republic) during 2003–2004. The studied habitats included the limnetic zone and two littoral zones, each dominated by a different type of emergent macrophyte, reed grass (Glyceria maxima) and common reed (Phragmites australis). Species richness (calculated as number of taxa) was higher in both littoral zones than in the limnetic zone. The seasonal development of limnetic and littoral zooplankton communities differed. In contrast to the two littoral zones, close correlation with chlorophyll-a concentration was found for rotifers and cladocerans in the limnetic zone. Moreover, cladocerans inhabiting littoral areas (mainly Bosmina longirostris) reached annual maxima during spring when chlorophyll-a concentrations were low.

The zooplankton taxa and their seasonal distribution are describeb for Loch Rusky, a shallow oligotrophic lake inthe central region of Scotland. 15 species were indentified: 11 Rotifera, 2 Cladocera and 2 Copepoda. Only 5 speciesPolyarthra remata, Keratella cochlearis, Filinia terminalis, Trichocerca sp. and Eudiaptomus gracilis occurred in sufficient numbers to facilitate a description of their seasonal pattern. The annual zooplankton variation was dominatedby rotifers for most of the year, but copepods (E. gracilis, Cyclops sp.) only were dominant in the epilimnion duringsummer. It is presumed that this pattern was the result of the rotifers faster rate of reproduction and higher grazingefficiency under oligotrophic conditions, as well as the decrease of larger zooplankton by the continuous programme of fish stocking in the lake.