关键词: 异色瓢虫, 杀虫剂, 亚致死效应, 繁殖力, 生态毒理学

Abstract: By the methods of experimental ecology, this paper studied the dynamic changes of the filtration and ingestion rates of Brachionus plicatilis enriched with single and mixed microalgal diets at optimum concentrations. The microalgal concentration, microalgal species, and culture duration all had significant effects on the filtration and ingestion rates of B. plicatilis. The filtration and ingestion rates of  B. plicatilis to the diets decreased with increasing culture duration. Under the experimental conditions, the filtration rate of B. plicatilis to the microalgae within 6 hours was in the order of Chlorella sp. > Isochrysis galbana > Chaetoceros muelleri, while that within the whole experimental duration (12 hours) was Isochrysis galbana > Chlorella sp. > Chaetoceros muelleri. The predation of B. plicatilis fed by mixed microalgal diet was with a preferential order of Isochrysis galbana > Chlorella sp. > Chaetoceros muelleri.

Key words: Harmonia axyridis, Insecticides, Sublethal effect, Fecundity, Ecotoxicology