Water temperature is increasing. There is a link to algae growth. We're seeing a longer growing season for algae in Lake Erie.
The lakes are all different. Lake Superior is a very large and deep lake, so it's a colder lake and it's not as responsive. Lake Erie is the shallowest of the lakes and that's why we're seeing more rapid changes, and more development of algae.
Certainly, water temperature is one of the factors.