Seawater - analysis, Water Pollutants, Chemical - toxicity, Chemical - analysis, Chemical - metabolism, Reproduction - drug effects, Trialkyltin Compounds - analysis, Gastropoda - chemistry, Trialkyltin Compounds - toxicity, Trialkyltin Compounds - metabolism, Gastropoda - drug effects, Gastropoda - metabolism, Gastropoda - physiology, Macaronesia, Macaronés...