Summary
Washington -- The 20th anniversary of the discovery of zebra mussels in the Great Lakes was marked last week with regret and a warning by U.S. and Canadian conservationists.
The tiny mussels are an invasive species that wreak havoc on aquatic ecosystems.See the full content of this document
Extract
Zebra Mussel Hits Landmark
"It's time to stop thinking of them as a Great Lakes crisis," said Jennifer Nalbone of Great Lakes United on a conference call. "The invasion struck suddenly, spread quickly a...
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