"why Ontario's fragile ecosystems are disappearing"

The cover story of the current issue of Ontario Nature magazine is a collection of articles profiling a few of the endangered ecosystems in southern and central Ontario. They've published all these articles on their site including Carolinian Zone and A Garden Of Rarities (the Ojibway Prairie Complex) by Lorraine Johnson, and Alvars and Wetlands by Andrea Smit.

Also, consider this from the Ruthven Park nature blog

Although only approximately 1% of Canada falls within the Carolinian Life Zone, more species of plants and animals are found here than anywhere else in Canada. Over 2200 species of plants are found within the Carolinian zone in Canada.