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TRAVERSE CITY, Mich. (AP) — Government scientists say dozens of foreign species may invade the Great Lakes in coming years, despite policies aimed at keeping them out. The National Center for Environmental Assessment issued the warning in a report this week. The study identified 30 species with a medium or high likelihood of reaching the Great Lakes and 28 others already in the lakes with a potential to spread and cause harm. Invasive species such as the zebra mussel and sea lamprey have disrupted the lakes’ natural systems and caused billions of dollars’ worth of damage. The report is designed to help resource managers in the region monitor waters for invasive species and prevent them from becoming established. Most invasives are believed to reach the Great Lakes in ballast water discharged by oceangoing ships.
Posted 1/7/2009
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