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| Format: | Artículo científico |
| Langue: | en |
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Universidad Autónoma de Baja California
2008
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=48034304 |
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Table des matières:
- Effects of exposure to arsenic in Corbicula fluminea: Evaluation of the histological, histochemical and biochemical responses MS Diniz HM Santos I Peres S Alves JL Capelo-Martinez PM Costa MH Costa Ciencias de la Tierra arsenic biomarkers Accumulation histopathology Corbicula fluminea Arsenic (As) is a common element in aquatic environments and it is originated from both anthropogenic and natural processes. It is a toxic metalloid, especially in the trivalent form (arsenite), to humans and wildlife, and consequently itscontamination of aquatic environments (especially groundwater and drinking water) is a serious public health problem in several regions around the globe, particularly in Asia, since it is known to cause cancer and other types of pathologies. The main goal ofthe present study was to assess the toxicological effects, bioaccumulation and ability to regulate As in Corbicula fluminea (Muller 1744), exposed to different concentrations of As in the water. One hundred fresh-water bivalves (1.6 ± 0.3 g) from theMinho River (Portugal) were randomly distributed in ten 20-L tanks and exposed to different nominal concentrations of As (100, 300, 500, and 1000 µg Lֿ¹) for 28 days. A tank with tap water free of chlorine was used as control. The assay was performed in duplicate, at a constant temperature of 20 ± 1ºC. The results showed a significant increase (P < 0.01) of As in the total concentration and cytosolic fraction after 28 days of exposure in all treatments. A significant increase (P < 0.01) inmetallothionein concentration was also detected in bivalves exposed to the different concentrations of As, in comparison with the controls. The histological and histochemical evaluation provided clear evidence that As accumulated in tissues, especially in the digestive gland, and caused tissue alterations in 50% of the organisms. 2008 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48034304 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.3 Vol.34