Antioxidants, Oxidative stress, Limpet, Nacella concinna, Antarctica, Diesel, Seawater contamination, Catalase - pharmacology, Superoxide Dismutase - analysis, Superoxide Dismutase - pharmacology, Glutathione Peroxidase - analysis, Biomarkers - analysis, Glutathione Peroxidase - pharmacology, Seawater - chemistry, Water Pollutants, Chemical - poisoning, Anim...