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Invasives destroying Great Lakes food chain

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Although zebra mussels have been affecting the ecology of the Great Lakes since they were first found in 1988, researchers are continuously surprised at how much damage they've caused. Now, biologists are wondering if zebra mussels and the more recently arrived quagga mussels are to blame for a collapse of the fishery in one of North America's largest lakes. The Environment Report's Lester Graham reports the researchers are also wondering if this collapse is a preview of what will happen to all of the Great Lakes.

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