摘要：In order to explore possible development process of red tides caused by Prorocentrum donghaiense,effects of concentrations of P. donghaiense and Oxyrrhis marina on the feeding behaviour of Oithonabrevicornis were investigated. The results showed that within the concentration range of P. donghaiense,1.0~5.0×10 4 cells·mL -1 , ingestion rates (IRs) and faecal pellet production rates (FPPRs) of O. brevicornison P. donghaiense increased with increasing concentrations of P. donghaiense, the maximum IR andFPPR were 620 cells·ind -1 ·h -1 and 31.67 pellet·copepod -1 ·d -1 , respectively. When the concentration of P.donghaiense was 10.0×10 4 cells·mL -1 , the IR value decreased to 400 cells·ind -1 ·h -1 and the FPPR valuedecreased to 13.33 pellet·copepod -1 ·d -1 , respectively. Within the concentration range of P. donghaiense,1.0~10.0×10 4 cells·mL -1 , filtration rates (FRs) of O. brevicornis decreased with increasing concentrationsof P. donghaiense. The results also showed that O. brevicornis could ingest O. marina fed P. donghaiense,and within the concentration range of O. marina, IRs of O. brevicornis on O. marina increased withincreasing concentrations of O. marina, while its FRs decreased, the maximum IR value and FR valuewere 300 cells·ind -1 ·h -1 and 0.23 ml·ind·h -1 , respectively. Within the concentration range of O. marina,FPPRs of O. brevicornis increased with increasing concentrations of O. marina, the maximum FPPRwas 21.67 pellet·copepod -1 ·d -1 , and FPPRs had a good linear relationship with IRs. In this study, “Copepods-red tide algae” and “Copepods-protozoa-red tide algae” food chain models can provide references forthe development process and regulating method of red tides caused by P. donghaiense.
