Effects of metal accumulation on oxidative metabolism of

Abstract

Context Bivalve fishery represents an important socio-economic resource in Río Negro province, and Mytilus platensis is the main exploited species. Thus, biomonitoring trace metals in this mussel is particularly relevant for both environmental protection and human consumption. Aim Anthropogenic pollution and its environmental impact on mussels were experimentally evaluated in situ in two coastline sites of northern Patagonia. Methods Trace metal concentrations were quantified in the water of a harbour area (Port of San Antonio Este) and a reference site (Isla Mejillón), an extraction location of M. platensis, were quantified. Metal accumulation and its effects on metabolic parameters were also measured in mussels. Results Higher concentrations of chromium, nickel and zinc in water were registered in the harbour, along with copper and chromium in gills, digestive gland and mantle of M. platensis, were registered in the harbour. Furthermore, superoxide dismutase activity was augmented, whereas glutathione concentration was reduced in the digestive gland and mantle of mussels from that area. Moreover, the highest glutathione-S-transferase activities in mantle and lipid peroxidation, regardless of organ, were also found there. Conclusion The harbour area has a negative effect on M. platensis and its effects on metal accumulation and oxidative imbalance are organ-specific. Implication This work provided new insights into metal uptake of a commercialised mussel in a realistic environment in Río Negro province.

Histological characterization and morphological alterations in gill and digestive gland in non-native bivalve from the Province of Buenos Aires: Spatial and seasonal evaluation

“…These results could indicate higher cellular activity due to stress factors and/or pollutants found in this study region, corroborating that human activity is more intense in AP. Morphological alterations in the digestive glands similar to those observed in this study were also found in eld oysters such as M. gigas, Magallana angulate ( Sabatini et al 2023). The change of the cell-type, also called cell-type replacement and the integrity of the digestive gland tissue, possibly occur through a loss of digestive cells and hypertrophy of basophilic cells (Marigómez et al 2006;Zaldibar et al 2007) and the extent of the interstitial connective tissue, can provoke disturbance in the metabolisms, accumulation of xenobiotics and in the food digestion (Marigómez et al 1998).…”