Tiny, Clingy and Destructive, Mussel Makes Its Way West

By JOHN COLLINS RUDOLF

LAKE MEAD, Nev. — Kneeling at the edge of the dock, Wen Baldwin began hauling on a length of nylon rope that disappeared into the depths of Lake Mead. One after another, an odd assemblage of objects — a water bottle, a chunk of concrete, a pair of flip-flops, a steel anchor — emerged from the emerald-green waters.

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