Zebra and Quagga Mussels have been implicated in the crash of populations of a key food source in the Great Lakes. This invertebrate eats algae, small organism that are also fed on by the Zebra Mussel. No algae, no Crustaceans. For more information,
http://dsc.discovery.com/news/2008/05/30/great-lakes-crustacean.html
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