Subcellular and body distributions of 17 trace elements in the variegated scallop Chlamys varia from the French coast of the Bay of Biscay

Abstract

Seventeen elements were analysed in the organs and tissues of the variegated scallop Chlamys varia, from the Atlantic coast of France. Concentration levels were determined in scallops of different sizes sampled in contaminated (La Rochelle Bay) and clean (Re Island) sites. Greater concentrations of Ag, Al, Ce, Cr, La, Mo, Nd, Ti, and V were found in the digestive gland while As, Cd, Co, Cu, Mn, Ni, Pb, and Zn were the highest in the kidneys. In the digestive gland, most of the metals were found in the insoluble fraction while As, Co, Cd, Mo, Ni, and V appeared to be mostly bound to soluble compounds. Among tissues, the adductor muscle always displayed the lowest trace element concentrations. According to size, Ag and Cd showed significantly higher concentrations in larger individuals, while Co and Zn were higher in the smallest ones. According to the sampling area, most of the metals, Ag, Al, Ce, Co, Cu, La, Mn, Nd, Pb, and Zn, showed significantly higher concentrations in La Rochelle Bay compared to the Re Island, reflecting differing inputs from industrial, domestic and harbour activities. However, Cr, Mo, Ni, Ti, and V concentrations did not display significant differences between sites and As and Cd were significantly higher at the Re Island. This study highlighted the ability of the variegated scallop C. varia to concentrate numerous trace elements to high levels, even those reported as poorly bioavailable for marine biota, such as rare earth elements.

Rare earth elements (REE) in freshwater, marine, and terrestrial ecosystems in the eastern Canadian Arctic

“…http://dx.doi.org/10.1101/174870 doi: bioRxiv preprint first posted online Aug. 10, 2017; Although it is known that REE are bioavailable to lichens and plants, 5,6,42 our results suggest that REE are also widely bioavailable to aquatic invertebrates (both freshwater and marine) and these taxa can therefore be considered good bio-indicators of REE contamination. A handful of marine studies have reported relatively high levels for individual REE in plankton, 43 flying squid, 44 and scallops 45 , and only one study has previously measured REE levels in freshwater invertebrates (snails) 5 . In this study, vascular plants had a mean ΣREE concentration of 1.12 nmolg -1 or 0.15 mgkg -1 (Table S4), which falls at the lower end of the range of previous reported values for above-ground tissue concentrations (0.06 to 1.6 mgkg -1 ).…”

Spring molybdenum enrichment in scallop shells: a potential tracer of diatom productivity in temperate coastal environments (Brittany, NW France)

“…A study of Mo bioaccumulation in scallop tissues and organs revealed the greatest concentration of Mo in the digestive gland (Bustamante and Miramand, 2005). In addition, Mo in the digestive gland appears to be mostly bound to a soluble fraction (Bustamante and Miramand, 2005 …”

Rare Earth Elements Behaviour at West Coast of Peninsular Malaysia Rocky Shore Ecosystem Using Saccostrea cucullata as Bioindicator

“…About 20-40 individuals of relatively same size (shell length of 4-5 cm) were hand collected during low tide period and placed in polyethylene bags with native water. They were endorsed to empty their guts for 24 h, following the method by Bustamante and Miramand [7], with little modification. All samples were assigned in plastic loads, sealed, categorized and saved at 4-6°C during transportation to the laboratory where the samples were cleaned with running Mili-Q water (18.2 Ω) to eliminate sediment and salt particles prior to store frozen.…”