期刊
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
卷 150, 期 4, 页码 521-527出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpc.2009.07.006
关键词
Neohelice (Chasmagnathus) granulata; Scenedesmus vacuolatus; Dietary copper uptake; Oxidative stress; Salinity; Trophic chain
资金
- CONICET (Consejo Nacional de Investigaciones Cientificas y Tecnicas)
- Universidad de Buenos Aires
We analyzed the dietary copper effects in the estuarine crab Neohelice (Chasmagnathus) granulata and its interaction with water salinity. Crabs were maintained at 2 parts per thousand and 30 parts per thousand salinity for 5 weeks and they were fed with commercial food supplemented with the green alga Scenedesmus vacuolatus previously exposed to copper. No mortalities were observed, but crabs maintained at 2 parts per thousand salinity accumulated on average 40% more copper compared to animals maintained at 30 parts per thousand salinity. At 2 parts per thousand salinity, superoxide dismutase (SOD) activity and reduced glutathione (GSH) levels were increased at the first and second weeks, respectively, while lipid peroxidation and protein oxidation were evident after 4 weeks of copper exposure. At 30 parts per thousand salinity, all measured variables increased progressively but were significantly higher only at the end of the assay (5th week), except for protein oxidation that remained unchanged throughout the experiment. The hepatosomatic index (HSI) was significantly decreased in response to copper exposure, but only in crabs acclimated to 2 parts per thousand . These findings have suggested that dietary copper exposure induces greater metal accumulation and larger oxidative stress responses in crabs maintained at 2 parts per thousand salinity. (C) 2009 Elsevier Inc. All rights reserved
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