Effects of mercury on physiological condition and content of the biomarker ALA in the oyster Ostrea edulis

Abstract

Ostrea edulis (L.) exposed to mercury in situ at Chemlnova In the western part of Nissum Bredning, Limfjord, Denmark, was compared to a non-exposed oyster sample from the uncontaminated eastern part of the area A similar comparison was made for oysters, exposed and non-exposed to Hg, in the laboratory. Comparisons were based on stepwise multiple regression analysis, and MANOVA, using these variables. shell length, volume between shell valves, tissue dry weight, length and width of shell muscle scar, and infection by the parasite B0nam.a ostreae (determined by ELISA). For the environmental as well as for the laboratory samples, no significant differences between exposed and non-exposed oysters were found. The content of the biomarker 6-aminolevulin~c acid (ALA) was detected by ion-exchange chromatography in all samples. ALA content (related to amount of soluble protein) was signdicantly elevated in mercury-exposed oysters, in both the field and the laboratory. Sirmlar differences were observed for environmental samples of cockles Cerastoderrna edule (L ) , mussels Mytilus edulis (L.) and periwinkles L~ttorina littorea (L.) from the Cherninova slte and from uncontaminated samples. Possible cause-effect of the mercury-related Increase of ALA In molluscs is discussed.

The impacts of emergent pollutants on Ruditapes philippinarum : biochemical responses to carbon nanoparticles exposure

“…lipid peroxidation (LPO)) and neurotoxicity (e.g., acetylcholinesterase (AChE)) (Bebianno et al, 2004). While several published studies show that these biochemical markers are useful in detecting possible damages in bivalves under anthropogenic disturbances, such as metal pollution (Brock, 1993;Gomes et al, 2013;Liu et al, 2011;Velez et al, 2016;Yesudhason et al, 2013), eutrophication (Verdelhos et al, 2005) and pharmaceuticals (Antunes et al, 2013;Correia et al, 2016;Freitas et al, 2015;Freitas et al, 2016;Matozzo et al, 2016), little is known on the biochemical alterations induced by carbon NPs (Canesi and Corsi, 2015;Cattaneo et al, 2009;Matranga and Corsi, 2012;Miller et al, 2015).…”