Alien Ocean: The Threat of Ecological Invasions

Green crabs, zebra mussels, seagrasses – animals and plants from around the world. Dozens of alien species are infiltrating hundreds of American harbors, bays, and rivers. How did they get here? And how are they changing our waters? This video tells the story of scallop fishermen, cargo ship captains and pilots, and the scientists who are pioneering a field called “invasion ecology.”