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Researchers discovered higher mercury levels in four native species of fish.
SAINT PAUL, Minn. — In nature, it's often the tiniest lifeforms that cause the biggest problems in the food chain.
Zebra mussels are tiny lifeforms that are invasive in Minnesota lakes, and scientists have long understood the negative impact they can have on ecosystems.
Infestations of zebra mussels can cling to boats, docks, and trailers, causing significant damage, and they can also filter out significant amounts of plankton that other lifeforms rely on to survive.
"Zebra mussels are awesome filter feeders. They can filter something on the lines of one liter of water per day. That’s a single zebra mussel, and they can have millions of these mussels in a lake,” University of Minnesota...
