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Title: Ruditapes decussatus and Ruditapes philippinarum exposed to cadmium: toxicological effects and bioaccumulation patterns
Author: Figueira, Etelvina
Cardoso, Paulo
Freitas, Rosa
Keywords: Clams
Metal contamination
Cd subcellular partitioning
Tolerance mechanisms
Issue Date: Aug-2012
Publisher: Elsevier
Abstract: Since differences in metal accumulation may exist between bivalve species, the aim of this study was to assess the impact of cadmium (Cd) on Ruditapes decussatus and Ruditapes philippinarum. For this, the Cd accumulation, mortality rates and biochemical responses were analysed in the two species after 5days of exposure, under laboratory-controlled conditions. The concentration of Cd that caused 50% of mortality on clams was two-times higher in R. decussatus than in R. philippinarum. For both species, higher percentage (84.5-98.2%) of the Cd was in the insoluble fraction, but the Cd concentration in solution was 3 to 8 times higher in R. decussatus. Nevertheless, R. philippinarum presented higher oxidative stress and higher CAT activity. The paradox observed between the two clams can be explained by the higher capacity of R. decussatus to increase the expression of MTs when exposed to Cd.
Peer review: yes
DOI: 10.1016/j.cbpc.2012.04.004
ISSN: 1532-0456
Appears in Collections:CBC - Artigos
CESAM - Artigos
DBio - Artigos

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