Scientists are sampling across all five Great Lakes to figure out what’s happening in one of the world’s largest freshwater systems in winter.
A group of scientists walked out on to frozen Lake Michigan to do something they’ve done time and again throughout the Great Lakes: collect water.
With sampling of more than 30 sites from Lake Superior to Lake Erie wrapped up, some Chicago researchers will now play a key role in making sense of the lakes’ tiniest members — who pose some of the biggest mysteries. Her lab will analyze samples from the Great Lakes sites to get a better picture of what the minuscule sentinels are up to. Analysis will likely take a few months once all the samples arrive, Coleman said, and then scientists will work together to make sense of the results.
When it comes to winter, Coleman said she’s curious to see if there are cold specialists, and expects there will be “plenty of microbes doing their thing.” have turned clear water green. Bloom predictors would be a welcome development as scientists try to figure out why potentially toxic blooms are happening in a lake that has largely escaped human blight.offers an example of why a baseline is important, Coleman said. “Our understanding is that the mussels have just completely changed the microbial community, but we don’t have samples from pre-quagga mussel time, so it’s hard to say.
U. of C. graduate student María Hernández Limón, used to sampling on the Lake Guardian, the EPA’s Great Lakes research vessel, said the trip required more thinking on the fly. They ended up hand filtering the water, pumping it through syringes like you might see in a doctor’s office — not the easiest task with water from Green Bay, an algae hot spot.
“When we think about the effects of climate change, seeing what’s happening on the lakes hits home,” Limón said. “We’re seeing less ice coverage. We’re seeing that the winters are more mild.”
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