Comparison of intermittent and continuous exposures to inorganic mercury in the mussel, Mytilus edulis: Accumulation and sub-lethal physiological effects
| Autor: | A. John Moody, D Amachree, Richard D. Handy |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Gills
Gill Hemocytes Time Factors animal structures Mytilus edulis Thiobarbituric acid Health Toxicology and Mutagenesis medicine.disease_cause Thiobarbituric Acid Reactive Substances Mass Spectrometry chemistry.chemical_compound Animal science TBARS medicine Animals Seawater biology Muscles Public Health Environmental and Occupational Health Environmental Exposure Mercury General Medicine Mussel Glutathione Environmental exposure biology.organism_classification Pollution Mytilus Oxidative Stress chemistry Environmental chemistry Water Pollutants Chemical Oxidative stress |
| Zdroj: | Ecotoxicology and Environmental Safety. 109:133-142 |
| ISSN: | 0147-6513 |
| DOI: | 10.1016/j.ecoenv.2014.07.025 |
| Popis: | Aquatic organisms are often subject to intermittent exposure to pollutants in real ecosystems. This study aimed to compare mercury accumulation and the physiological responses of mussels, Mytilus edulis during continuous and intermittent exposure to the metal. Mussels were treated in a semi-static, triplicated design to either a control (no added Hg) or 50 µg l(-1) Hg as HgCl2 in continuous (daily) or intermittent (2 day exposure, 2 days in clean seawater alternately) exposure for 14 days. A time-dependent increase in Hg accumulation was observed in the continuous exposure, while the intermittent treatment showed step-wise changes in Hg concentrations with the exposure profile, especially in the gills. At the end of the experiment, tissue Hg concentrations were significantly increased in the continuous compared to the intermittent exposure for digestive gland (4 fold), gonad and remaining soft tissue (>2 fold), but not for the gill and adductor muscle. There was no observed oxidative damage at the end of the experiment as measured by the thiobarbituric acid reactive substances (TBARS) concentrations in tissues from all treatments. However, total glutathione was significantly decreased in the gill and digestive gland of both the continuous and intermittent exposure by the end of the experiment. The neutral red retention ability of the haemocytes was not affected, but total haemocyte counts were significantly decreased ( |
| Databáze: | OpenAIRE |
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