Zebra mussels hold on tighter than quagga mussels

Love them or hate them, zebra mussels are having a big effect on the ecosystems that they invade. While the bivalves clarify freshwater lakes and rivers, they also smother surfaces, clog pipes and wipe out indigenous mussel populations. The zebra mussels that have wreaked ecological havoc on the Great Lakes are harder to find these days — not because they are dying off, but because they are being replaced by a cousin, the quagga mussel. But zebra mussels still dominate in fast-moving streams and rivers.

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