structural:summarization, information:classification
Biodiversity

New England contains forested ecosystems with a variety of terrestrial vertebrates. Land-use patterns and land disturbance, such as the dramatic increase in land clearing for agriculture in the mid eighteenth century to nineteenth century, greatly altered the ecosystem and resulted in extinctions, local extirpations, and recolonizations.

According to an analysis of USDA Forest Service data, tree species diversity increases from north to south at about 2-3 species per degree in latitude. In addition, taller trees are associated with higher tree species diversity, and tree height is a better predictor than general forest age or biomass. Due to an increasing the amount of nitrogen in the soil from climate change, the red maple is becoming one of the most abundant trees in the region, and outcompeting other maples such as the sugar maple.