Spring-neap tides influence on bioavailability of metals and bioaccumulation in edible biota of the Zuari (tropical) Estuary

• Published in: Environmental monitoring and assessment 2021-04, Vol.193 (4), p.167, Article 167
• Main Authors: Nasnodkar, Maheshwar R., Nayak, Ganapati N., Bhangle, Priyanka P., Tiwari, Anoop Kumar
• Format: Article
• Language: English
• Subjects: Accumulation; Animals; Anthropogenic factors; Atmospheric Protection/Air Quality Control/Air Pollution; Bioaccumulation; Bioavailability; Biological Availability; Biota; Cadmium; Chromium; Contamination; Copper; Earth and Environmental Science; Ecology; Ecotoxicology; Environment; Environmental Management; Environmental Monitoring; Environmental science; Estuaries; Estuarine dynamics; Geologic Sediments; Heavy metals; Human influences; Iron; Lead; Manganese; Marine organisms; Metal concentrations; Metals; Metals, Heavy - analysis; Monitoring/Environmental Analysis; Neap tides; Physicochemical processes; Physicochemical properties; Pollutant load; Pollution index; Pollution load; Spring tides; Stations; Tides; Toxicity; Tropical climate; Water Pollutants, Chemical - analysis; Zinc
• ISSN: 0167-6369; 1573-2959
• DOI: 10.1007/s10661-021-08970-x

Role of spring and neap tides on metal bioavailability and bioaccumulation in edible biota was studied in the Zuari Estuary. Moderate to very high range of contamination factor for Fe, Mn, Cr, Zn, Cu, Cd, and Pb at one or more stations and tides suggesting their anthropogenic origin. The anthropogenic input of metals was supported by pollution load index. Relatively high bioavailable concentration of Fe, Mn, Cr, Zn, Cu, Cd, and Pb indicated their toxicity to biota. Total metal concentration, viz., Fe, Mn, Cr, Zn, Cu and Cd, and bioavailable content Mn, Cd, and Pb were higher during spring tide than neap tide at one or more stations which revealed their low mobility under flooded conditions. The above observation was well supported by higher concentration of Fe, Mn, Cr, Zn, Cu, and Pb in Polymesoda erosa at the middle estuary during neap tide than subsequent spring tide. Further, an increase in concentration of metals bound to certain bioavailable fractions toward the surface of the cores revealed their possible bioavailability to the biota with changes in the physicochemical properties of the Zuari estuary. Biota sediment accumulation factor revealed macro level accumulation of Cd and suggested its toxicity to marine biota.