Understanding lake ecology

Lake ecology has a big impact on lake health. Native and invasive species can interact in complex ways, even impacting water clarity and our economy.

Learn more about key topics:

The following organisms are present in the Madison lakes and can have a big impact on water quality.

Lake Levels

Water is the link that holds the Yahara Watershed together – learn more about lake levels.

Cyanobacteria

Cyanobacteria blooms can close beaches and even release toxins – learn more about cyanobacteria.

Zebra Mussels

This recently-discovered invasive species is radically changing the ecosystem of our lakes – learn more about zebra mussels.

Daphnia & Spiny Water Flea

Learn about two tiny organisms that have a major impact on water clarity in our lakes – learn more about Daphnia and spiny water flea.

Carp

Despite their longtime presence, carp are considered an invasive species with harmful impacts on native ecosystems – learn more about carp.

Eurasian Watermilfoil

Eurasian watermilfoil was first recorded in lake Mendota in 1962 and can now be found in all of Madison’s lakes – learn more about Eurasian watermilfoil.

About the lakes

The 62-mile long Yahara River connects lakes Mendota, Monona, Wingra, Waubesa, and Kegonsa in a chain that winds through south-central Wisconsin. Learn more about each lake, and follow the links to lake-by-lake pages with annual updates on water quality conditions.