Bioconcentration of Cd and Ni in various tissues of two marine bivalves living in different habitats and exposed to heavily polluted seawater

Abstract

Two marine bivalves, Mytilus galloprovincialis and Callista chione, were exposed to various concentrations of cadmium and nickel (0.5, 1.0, 2.5 and 20 ppm), for 20 days, plus 10 days’ depuration period, in a laboratory experiment. Animals from each experimental condition were dissected and the bioaccumulation and distribution of Cd and Ni were determined in their gills, mantles and remaining bodies. The concentrations of Fe and Zn were also measured. Heavy metal tolerance, bioconcentration and distribution of heavy metals in tissues were considerably different in M. galloprovincialis and C. chione: (i) both animals were tolerant to Ni pollution, even at the highest concentration used; (ii) C. chione was more tolerant to Cd; (iii) M. galloprovincialis was a better Cd and Ni accumulator, with the exception of the highest Cd concentration tested, where C. chione accumulated more Cd; (iv) Fe and Zn levels were much more affected in M. galloprovincialis; (v) in general, accumulation and distribution of Ni and Cd in the tissues were metal-, species- and time of exposure- dependent; (vi) significant amounts of heavy metals remained in the tissues after 10 days’ depuration. Our results support a hypothesis for a two competing processes mechanism for metal accumulation and detoxification

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Heavy metals contamination and associated health risks in food webs—a review focuses on food safety and environmental sustainability in Bangladesh

“…The trophic transfer of heavy metals from the primary source to surrounding ecosystems and food webs is a crucial concern for global food safety (Ali and Khan 2019;Kumar et al 2019) and can be regulated by several transfer factors, such as bioaccumulation, defined as the ratio of metal concentration in an organism's tissue to that in an abiotic medium (Mortuza and Al-Misned 2015); biomagnification, defined as the ratio of metal concentration in an organism to that in the organism's diet (Yarsan and Yipel 2013); and bioconcentration, defined as the ratio of metal concentration in a studied organism to that in water (Chalkiadaki et al 2014;Ali and Khan 2019). An earlier study focusing on the transfer of heavy metals through various terrestrial food web pathways highlighted the health risks that develop with biomagnification of transported heavy metals from the primary source to consumers (Gall et al 2015).…”

The Hellenic Marine Observing, Forecasting and Technology System—An Integrated Infrastructure for Marine Research

“…Reliable and accurate measurements of elements at trace and ultra-trace concentrations (Table 11) are needed in a variety of research activities. LEC-NKUA utilizes conventional atomic absorption spectrometers and inductively coupled plasma-mass spectrometry (ICP-MS) for the determination of multiple elements in various contaminant monitoring and bioaccumulation studies [42][43][44][45][46]. Inductively coupled plasma-mass spectrometry (ICP-MS) (Figure 18) is a powerful technique to measure the level of trace metal contamination and assess environmental status, and is advantageous in that ionization is more complete as it occurs in a chemically inert environment, preventing oxide formation.…”