The first fish came to the Great Lakes after glacial retreat created them thousands of years ago. Now those fish are on the move again.
I think it’s important to realize that fish, like many other species, are adapting to climate change and that we don’t yet fully understand the consequences.
We have a really diverse set of fish in the Great Lakes, over 150 native fishes, that these fishes evolved elsewhere, but colonized the Great Lakes given the opportunity of the retreat of the glaciers. I was able to use a combination of museum records and records from the Ontario Ministry of Natural Resources and forestry surveys to show that fishes that are warm water adapted like bass, largemouth bass, and smallmouth bass, were actually moving north and establishing in lakes that were really too cold for them in the past, but were warming up.It was over thousands of years that these fish moved. It’s similar, in that it was the warming of the climate over a longer period of time.
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