Journal
MARINE POLLUTION BULLETIN
Volume 176, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2022.113422
Keywords
Bioaccumulation; Trace metals; Sediments; Meretrix meretrix
Funding
- COMAPS laboratory, National Centre for Earth Science Studies (NCESS)
- Central Chemical Laboratory, National Centre for Earth Science Studies (NCESS)
- Ministry of Earth Sciences (MoES), Govt. of India
- National Centre for Earth Science Studies (NCESS), Thiruvananthapuram, Kerala
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This quinquennial study evaluated the bioaccumulation pattern of trace metals in Meretrix meretrix. It found a strong association between the concentration of trace metals in the clam and the corresponding metal concentration in the sediments. The study also discovered that the intake of trace metals by the clam is influenced by seasonal variation, chemical speciation, and metabolic stress.
A quinquennial seasonal study (2015-2019) has been conducted to evaluate the bioaccumulation pattern of trace metals in Meretrix meretrix. The concentration of trace metals in the clam was observed as Cr > Cu > Ni > Zn > Pb > Cd > Hg, (Body > Mantle > Gills), similar to sediments. Contamination Factor of Cu and Cr in sediments showed strong association with the corresponding metal concentration in the body (r = 0.687, r = 0.962), mantle (r = 0.880, r = 0.956) and gills (r = 0.937, r = 0.863). Bioconcentration Factor was high for Cr followed by Ni. Mean Metal Concentration Rate (MMCR) of Cr was high and Hg was low (Body > Mantle > Gills). Our study establishes that the trace metal intake by Meretrix meretrix is associated with seasonal variation, physicochemical factors, sediment texture, chemical speciation and the metabolic stress created within the species induced from increased demand for protein synthesis. The latter resulted in the augmented rate of accumulation of Cu and Cr.
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