Abstract
Species composition, seasonal changes in abundance and biomass of planktonic protozooplankton (ciliates, heliozoans and testaceans), and dynamics of the dominant species were investigated over more than two years in two shallow mesotrophic lakes. The macrophyte-dominated lake Biandantang had more protozoan species than the algal lake Houhu, and the two lakes had significantly different protozoan abundance and biomass patterns, compositions and dominants. On annual average, ciliates formed 81.13%, 91.10%, heliozoans 0.20%, 3.49%, and testaceans 18.67%, 5.42% of total protozoan biomass; the protozoans, in turn, formed 49.77%, 49.48% of total zooplankton biomass in lake Biandantang and Lake Houhu, respectively. With respect to ciliates, naked oligotrichs and Peritrichida (mainly 40–80 μm in size) dominated the abundance and Peritrichida dominated the biomass in Lake Biandantang, while Scuticociliatida (mainly smaller than 30 μm ) dominated the abundance and tintinnids dominated the biomass in Lake Houhu.
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