There were two peaks (i.e.spring peak,autumn peak),of the abundance and biomass of protozoan in a year,the autumn peak was larger than those of spring peak.

• 原生动物数量变动曲线一般有春末和仲秋两个高峰，秋季高峰远大于春末高峰。原生动物年生物量变动曲线与数量变动曲线基本上一致。