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The lamprey came in the early 1800s with the opening of the Erie Canal
The lamprey came in the early 1800s with the opening of the Erie Canal

Tracking early invaders

Last year, the Great Lakes Radio Consortium asked 28 scientists and stakeholders to rank the major environmental issues affecting the region. The GLRC then sent a team of reporters throughout the region to explore these issues in-depth. The experts agreed that invasive species top the list. There are more than 160 non-native species in the Great Lakes and St. Lawrence Seaway. If they do harm to the ecosystem or the economy, they're labeled "invasive." Different species came in different ways - at different times. David Sommerstein looks at how some of the earliest invaders got into the region's waters.

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