GLIN Posted October 16, 2018 Share Posted October 16, 2018 Starting around 1979, smelt numbers in Lake Superior plummeted. But because the smelt in Lake Superior are an invasive species, their decline is actually a sign that the lake is becoming healthier, ecologically speaking. Read the full story by FiveThirtyEight. View the full article Link to comment Share on other sites More sharing options...
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