At the Ria de Aveiro Lagoon in Portugal the day starts early for European scientists as they set out to gather samples.br br The lagoon offers a rich but fragile 75 square kilometre ecosystem of wetlands, seagrasses and salt marshes used as nursery areas for bivalves, crustaceans, fish and birds.br br It is a natural treasure that, as with other European coastal lagoons, is facing huge threats.br ...