Invasive mussels are a danger to water systems in the West

By Felicia Fonseca / The Bulletin
July 19, 2009

LAKE MEAD NATIONAL RECREATION AREA, Nev. — Two years after an invasive mussel was first discovered at Lake Mead, the population has firmly established itself and gone on a breeding binge, with numbers soaring into the trillions.

Despite efforts to stop their spread, scientists say....

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