I think there are a number of primary ways in which they do that. First and foremost is in terms of removing nutrients and sediments and preventing those elements from entering into the lake and causing the disruption of the lake ecosystem; that's the primary one.
In terms of the value of the wetlands, they are critical habitats. They are important to waterfowl, which is why Ducks Unlimited is interested in them, but also to a multitude of other species that are critically important, things like the fish that live in the Great Lakes and Great Lakes Basin and that are important to people. They are one of the highest densities of species at risk that occur within our wetlands along the Great Lakes.
I think the other key value that they provide as well is mitigation of flooding by providing storage and intercepting water as it's moving through the systems.
Also, I talked in my presentation about some of the economic consequences of having those wetlands in place and the functions that they provide.