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IMAGE: Gretchen Hansen
“The rate of increase in air temperature has accelerated in recent decades, and this increase in air temperature will affect the thermal habitat for fishes across the region,” Wagner said. “Temperatures are projected to continue increasing across the Midwest – with the greatest increases in average temperature expected in northern areas – so we wanted to know what was happening with walleye populations in the upper Midwest.”
Using data provided by the Minnesota and Wisconsin departments of Natural Resources, researchers quantified annual walleye early-life growth rates from 1983 to 2015 in 61 lakes in the upper Midwest. Then they estimated the relationship between early-life growth rates and water growing degree days – an indicator of the temperature the fish are exposed to – over those 32 years. Importantly, they also examined how water turbidity influenced growth rates across the 61 lakes, correlated to an increased number of growing degree
Applied-sciencePennsylvaniaUnited-statesNorth-carolinaMinnesotaIndianaWisconsinCanadaUniversity-of-minnesotaCanadianTyler-wagnerGretchen-hansenClimate change is affecting the kind of fish you can catch in Michigan s inland lakes
Mike Davis at Watkins Lake State Park and County Preserve.
CREDIT LESTER GRAHAM / MICHIGAN RADIO
“I got a couple of fish I got in there,” Mike Davis said as he ducked out of his ice fishing tent. He and his friend were catching perch and some bluegill.
Davis is from Adrian, about a half-hour away from this lake in southeast Jackson County.
These two say they love to go ice fishing on lakes in southern Michigan, but they’re seeing some changes.
“I have noticed it seems like when I was younger me and him was talking about the other day, too seems like we used to get like a foot of ice. And now it’s like we’re down to four inches,” Davis said.
MinnesotaUnited-statesWisconsinCanadaGull-lakeMichiganUniversity-of-minnesotaJordanGretchen-hansenJoe-nohnerAtmospheric-administrationNational-oceanicNorth-central Minnesota lakes are getting murkier faster Lake water temps are rising fastest in the northern forests, promoting algae blooms. February 20, 2021 5:45pm Text size Copy shortlink:
Leif Olmanson has spent most of his career tracking Minnesota s lakes from space, poring over decades of satellite images and crunching data on water clarity.
Now the University of Minnesota researcher is puzzling over a new question: What is driving the declining water clarity in Minnesota s northern lakes, some of the jewels of the state? My big concern is that the areas that are more pristine are where things are changing quickly, Olmanson said. Why would these lakes be changing in northern Minnesota where there s not a lot of land use changes going on?
MinnesotaUnited-statesCanadaUniversity-of-minnesotaCrow-wingLeif-olmansonGretchen-hansenPeter-jacobsonKenneth-blumenfeldCasey-schoenebeckJennifer-bjorhusDepartment-of-natural-resources