| inshore/offshore gradients of imposex and organotin contamination in nassarius reticulatus (l.) along the portuguese coast. | imposex and organotin (ot) tissue contamination of the netted whelk nassarius reticulatus (l.) were assessed in the continental shelves around the main estuaries of the central coast of portugal (lisbon: tagus estuary; setúbal: sado estuary) and the main coastal lagoon in the southern of portugal (faro: ria formosa). pollution levels were higher in areas of more intense boat traffic and shipyard activities and imposex showed a clear decreasing gradient from the estuaries to the offshore, in rela ... | 2008 | 18501385 |