by Marissa Sandoval

This is the final article in a 3-part series about ballast water. Part 1 provided a brief history of ballast water and its accompanying invasive species threats. Part 2 illustrated how scientists from the Smithsonian Environmental Research Center (SERC) are researching technology to prevent invasions and keeping an eye on current ones. This article shows how SERC scientists are working to predict vulnerable spots for ballast water invasion, using shipping networks and commercial trade information.
They say you can never step into the same river twice, since the water’s always running. The same could be said about waters on the shore. Not only do currents sweep the waves to and fro, but new seawater is also constantly being introduced from the ballast tanks of globetrotting ships.
It’s estimated that foreign ships discharge over 180 million metric tons of ballast water off U.S. coasts each year, according to the National Ballast Information Clearinghouse (NBIC). In each ton comes a chance for aquatic critters from foreign ports to invade new shores.
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