Thanks for your question. I know that area very well; I used to live in Barrie, Ontario.
The challenge with protecting wetlands, of course, is to know where they are to classify them and to afford some degree of protection.
You're absolutely right that land management falls under the provincial area of jurisdiction, so we end up straddling through our policy work in the federal end and provincial acts, regulations, policies and so on. Really the most effective thing to do would be to have comprehensive policies in place to protect wetlands, and Ontario does have a policy to protect provincially significant wetlands, which is about one third of the province. That, of course, leaves the remaining two thirds of the wetlands in the province relatively unprotected.
There are some further precedents or approaches to avoid, minimize and mitigate impacts, so, when you do undertake linear construction activities like road building, we recommend, as do most conservation organizations when habitat loss takes place, that efforts be made to minimize, avoid or mitigate the impact.
As for mitigation, there are some very robust policies at hand in certain provinces in Canada. The Atlantic provinces have good policies in place, as does Alberta, but certainly putting in place policies to address those losses and to replace lost wetland area and function would be the most effective way to do that.