- Great Lakes fish are relatively young, evolutionarily speaking, but have faced many crises
- The latest is climate change, a U-M professor says
- The lakes are home to 150 species of fish and warmer temperatures threaten whitefish, burbot and others
Geologically speaking, the Great Lakes and the aquatic life within them are relatively young at a few thousand years old. Yet in their short life, they’ve contended with many changes, from invasive species to overfishing.
Now, climate change poses a new existential threat.
As fossil fuel consumption heats the world’s atmosphere, the fallout extends to a Great Lakes ecosystem that’s home to 150-plus native fish.
Related:
- In warming Great Lakes, climate triage means some cold waters won’t be saved
- EPA to decide soon on Ohio plan to reduce phosphorus pollution in Lake Erie
- Chicago suburbs, running out of water, will tap Lake Michigan
Warming waters are already changing the distribution of freshwater fish in the basin, causing warm water fish like bass to move into areas that formerly were too cold for them to thrive.
And conversely, warming temperatures threaten the future of cold water fish like whitefish and burbot, which spawn on ice-covered Great Lakes reefs.
But as those threats unfold, “humans can have a lot of impact on preserving that biodiversity,” said Karen Alofs, an assistant professor at the University of Michigan who studies the impacts of warming temperatures on fish in the Great Lakes.
Work to preserve Michigan’s native fish ranges from efforts to cool the streams that flow into the Great Lakes by planting shade trees and removing dams, to habitat restoration and invasive species prevention efforts that aim to ease other threats to the fish so they can better withstand warming waters.
And amid the threat of warming, species managers in Michigan aren’t giving up hope of returning a native Goldwater fish already lost to human forces. The state is seven years into an effort to reintroduce Arctic grayling to Michigan’s rivers.
About the author
Aaron Martin is a documentary filmmaker based in Canton, Michigan. This story was produced in partnership with the Pulitzer Center’s Connected Coastlines, a nationwide climate reporting initiative.
Thank you to our Michigan Environment Watch sponsors
Environment Watch is made possible by generous financial support from our sponsors. Please visit the About page for more information and to subscribe to Environment Watch. Interested in becoming a sponsor? Contact Emma Carr.
Republish our articles for free, online or in print, under our Republication Guidelines. Questions? Email republishing@bridgemi.com
