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- W3136552057 endingPage "130338" @default.
- W3136552057 startingPage "130338" @default.
- W3136552057 abstract "Impact of varying concentrations and counts of toxic metals and indigenous bacteria on antioxidative defense system in edible oyster, Saccostrea cucullata, collected from four tropical estuarine systems of Goa (west coast of India), are presented in this study. Relatively high abundance of bacteria was estimated from the oysters especially during monsoon season (June–September). Density of total and fecal coliforms were about 24 times higher in the organism than the surrounding water (average TC: 4360 and FC: 3475 MPN 100 ml −1 ). Sedimentary Cd, Pb, and Hg concentrations varied from 0.12 to 0.48, 19.28–102.48, and 0.03–0.13 mg kg −1 (dry wt.) while, bioaccumulation of Cd, Pb, and Hg in the oysters ranged from 5.17 to 10.6, 0.18–7.99, and 0.06–0.22 mg kg −1 (dry wt.) respectively. Higher degree of pollution and moderate ecotoxicological risks with increasing toxicity (36–37%) was observed in two of the tropical estuaries. Biomarker response in the oysters was somewhat inconsistent with pollution load in the estuarine systems. Elevated environmental stress was observed during pre-monsoon (March–May) followed by the monsoon period. Sedimentary metals were identified as predominant inducers of antioxidative defence system in oysters from the study areas. This study suggests that, biomarker can be useful in assessing the combined effects of metal and bacterial contaminations on native oysters and in evaluating environmental quality in tropical estuarine systems. • Ecotoxicological risks assessment of estuarine sediment could prevent adverse biological effects in marine organisms. • Metals (especially Cd and Pb) and bacteria predominantly induce antioxidative defence system in marine organisms. • Site specific anthropogenic activities mostly responsible for exerting environmental stresses on native organisms. • Ecotoxicological risk elevates during the pre-monsoon season (March–May)." @default.
- W3136552057 created "2021-03-29" @default.
- W3136552057 creator A5013885648 @default.
- W3136552057 creator A5014721399 @default.
- W3136552057 creator A5073166440 @default.
- W3136552057 creator A5084953568 @default.
- W3136552057 date "2021-09-01" @default.
- W3136552057 modified "2023-09-26" @default.
- W3136552057 title "Biochemical responses of oysters in evaluating environmental quality of tropical Indian estuarine systems" @default.
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