In the context of marine oil spill incidents,the ecological integrity of the marine environment is jeopardized.In the pursuit of intertidal zone organisms serving as indicators for monitoring crude oil pollution,we investigated the oxidative stress responses in the gills of two bivalve species,Sinonovacula constricta and Tegillarca granosa,exposed to crude oil contamination.The enzymatic activities of superoxide dismutase(SOD),catalase(CAT),glutathione peroxidase(GPx),and glutathione-S-transferase(GST)in the bivalve gills were assessed after 24 h and 72 h of exposure.The findings indicate that in the S.constricta,SOD activity was induced at 24 h and exhibited concentration-dependent suppression at 72 h,while CAT,GPx,and GST activities were induced at both time points.Conversely,the T.granosa displayed opposing trends in SOD and CAT activities at 24 h,with GST activity showing an inverse pattern,and GPx activity being induced at 72 h.This study underscores the suitability of the S.constricta as a more adept indicator organism for monitoring intertidal zone crude oil pollution.
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