Oxygen is a key element involved in a variety of vital physiological reactions in aerobic organisms, including those produced in the electron transport chain, hydroxylation, and oxygenation. The susceptibility of bivalves to ashes, at environmentally relevant concentrations, raises concern about the effects of post-fire runoff to bivalve species.
Relative to the control, AEAs-exposed clams showed higher Cd content, whereas AEAs-exposed cockles showed higher Cu content, thus exhibiting different responses to the exposure to wildfire ash. For both species, a significant effect in the total glutathione peroxidase activity was observed at AEA concentrations ≥ 25%. Similarly, significant effects on lipid peroxidation were observed for cockles, but not for clams. edule at AEA concentrations ≥ 25%, unlike for C. A significant increase in the protein content of soft tissues was observed for C.
The activity of various enzymes, as well as lipid peroxidation, protein content, and metal body burden, were determined after 96 h of exposure. Organisms were exposed to different concentrations (0%, 12.5%, 25%, 50%, and 100%) of aqueous extracts of Eucalypt ash (AEAs) from a moderate-to-high severity wildfire. This study aimed to compare the antioxidant defense response of the freshwater clam Corbicula fluminea and the marine cockle (Cerastoderma edule) to wildfire ash exposure and the concomitant metal body burden. Wildfires constitute a source of contamination to both freshwater and marine ecosystems. All these proteomic data provided from the literature suggest that alterations in oxida-tive stress due to marine pollution are closely linked to robust and confident biomarkers for seafood safety. The main response mechanism of bivalves in a polluted marine environment is based on the antioxidant defense system against oxidative stress. It has been demonstrated that marine pollutants are altering the bivalve proteome, affecting many biological processes and molecular functions. Hence, proteomic technologies could be considered as a useful tool for the discovery of protein biomarkers as a first step to improve the protocols of seafood safety. Rapid and accurate detection of food safety problems in bivalves could be carried out easily by protein biomarkers.
New approaches for the search of biomarkers would help us to monitor pollutants and move towards a more global point of view protocols for the aquaculture industry would also be improved. However, the threat of marine pollution including heavy metals, persistent organic pollutants and other emerging pollutants is of ever-growing importance and seafood safety may not be guaranteed. Seafood is widely recognized for its high nutritional value in our diet, leading to major health benefits. However, marine pollution will also likely give rise to serious problems for the food safety of molluscs. Aquaculture production as an important source of protein for our diet is sure to continue in the coming years.
0 kommentar(er)
