Host-Parasite Interactions - drug effects, Cardiidae - drug effects, Animals, Water Pollutants, Chemical - toxicity, Metals, Heavy - toxicity, Estuaries, Trematoda - physiology, Biodiversity, Cardiidae - parasitology, Portugal
Benthic macroinvertebrates, Chironomus riparius, In situ bioassays, Metal contamination, Organic contamination