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Top Ten Threats to the Great Lakes: Predicting New Invaders

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There are new problems for the Great Lakes on the horizon. As part of the series, "Top Ten Threats to the Great lakes", new invasive species are one of the ten threats. There are more than 160 foreign species in the Great Lakes now, and scientists are expecting others to make their way into the Great Lakes ecosystem in the near future. The outsiders crowd out and disrupt the natural food chain. As Zach Peterson reports, it's likely more will be coming.

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