微塑料对四角蛤蜊滤食、呼吸和免疫指标的影响OA北大核心CSTPCD

To determine the effects of microplastics on the physiological behavior and immune system activity of Mactra veneriformis,the effects of polystyrene(PS)exposure at different concentrations(1×104 molecules/L and 1 ×106 molecules/L)and particle sizes(1 μm and 80 nm)on the filtration rate,respiration rate,malondialdehyde(MDA)content and impacts on activities of enzymes such as catalase(CAT),superoxide dismutase(SOD),acid phosphatase(ACP),alkaline phosphatase(AKP)were investigated.The results revealed that only the low concentration group of 1 μm had a significant effect on the filtration rate;the respiration rate was significantly increased under exposure to large particles of polystyrene at high con-centrations.The activities of SOD and CAT both increased significantly in the early stages of the experiment and then de-creased.ACP activity increased significantly in the early stages and gradually decreased.The changes were not statistically significant.AKP activity changed significantly after 3 days,and the activity in the group exposed to low concentrations was higher than that of the group exposed to high concentrations.Moreover,MDA content significantly increased in the group exposed to high concentrations compared to the group exposed to low concentrations,and MDA content of the group ex-posed to small polystyrene particles increased compared to the group exposed to large particles.Different concentrations,particle sizes,and exposure times affected multiple physiological indicators.MDA content of M.veneriformis gills can be used as a reliable indicator to assess marine microplastic pollution.