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The Eastern Temperate Forests is a Level I ecoregion of North America designated by the Commission for Environmental Cooperation (CEC) in its North American Environmental Atlas. The region covers much of the Eastern and Midwestern United States, the U.S. Interior Highlands, and parts of Ontario, Quebec, and the Maritimes.
The eastern forest–boreal transition is a temperate broadleaf and mixed forests ecoregion of North America, mostly in eastern Canada. It is a transitional zone or region between the predominantly coniferous Boreal Forest and the mostly deciduous broadleaf forest region further south.
This ecoregion contains a number of mountainous areas on the east coast of Canada and along the Saint Lawrence River in eastern Quebec (including Anticosti Island in the Saint Lawrence) and the coast up to near Labrador, on the island of Newfoundland, in the highlands of New Brunswick, and the Cape Breton Highlands on Cape Breton Island, Nova Scotia.
1990 USDA Hardiness zone map detail for the northeast US. Zone 3a is light orange, zone 4b is light lavender. The area is a temperate broadleaf and mixed forests biome transition zone between the true boreal forest to the north and the Big Woods and Carolinian forest to the south, with characteristics of each.
Alaska is the most biodiverse state with 15 ecoregions across three biomes in the same realm. California comes in a close second with 13 ecoregions across four biomes in the same realm. By contrast, Rhode Island is the least biodiverse with just one ecoregion—the Northeastern coastal forests —encompassing the entire state.
The colder climate allows more hardwood trees to grow in the Gulf of St Lawrence than in most of this part of northeast North America. Trees of the region include eastern hemlock (Tsuga canadensis), balsam fir (Abies balsamea), American elm (Ulmus americana), black ash (Fraxinus nigra), eastern white pine (Pinus strobus), red maple (Acer rubrum), northern red oak (Quercus rubra), black spruce ...
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Open forests of ponderosa pine and some lodgepole pine distinguish this region from the Cascades ecoregion, where hemlock and fir forests are more common, and from the lower, drier ecoregions to the east, where shrubs and grasslands are predominant. The vegetation is adapted to the prevailing dry, continental climate and frequent wildfire.