Mussel watch, Transplanted mussels, NOAA, Indigenous, GulfWatch, PCB, Boston Harbor, DDT, PAH, Lead, Status and trends, Resident, Caged mussels, Chlordane, Mercury, Environmental Monitoring, Water Pollution - statistics & numerical data, Animals, Polycyclic Aromatic Hydrocarbons - metabolism, Mytilus edulis - metabolism, Chlordan - metabolism, DDT - metaboli...