Story thread · 2 reports / 2 sources
University of Minnesota Research links zebra mussels in Minnesota lakes to higher mercury levels in fish
kare11.com · 2h
How the coverage leans
Across 2 sources · syndicated copies counted once
Researchers discovered higher mercury levels in four native species of fish.
First report: Volunteers search Minnesota lakes for zebra mussel DNA — mprnews.org, 1d
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