New England Ecology

I'm reading a book by William Cronon, "Changes in the Land" that details the effect that Indians and English colonists had on the New England landscape.
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Dramatic changes in a short period of time involving the wildlife and vegetation of this region.
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It would seem that the land has always been in a state of flux. Incredibly, there is probably more woodland and wildlife in New England now than at the beginning of the eighteenth century, since we do not look to the land as our primary sustenance and are not grossly effecting land use changes. Deer, moose and turkeys were all harvested and not in any abundance 100 years ago.
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I've noticed increases and fluctuations in wildlife in my own time here.