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. It has areas of both
broadleaf and
conifer forest cover, and bodies of water ranging from lakes to conifer
bogs and
swamps. Conifers include
pines,
spruces,
firs, and
junipers; deciduous types include
aspens,
paper birches,
mountain ash and
maples. It is often said to have a distinct smell, which is attributed partially to the presence of
sweet fern and
balsam poplar. The climate roughly corresponds with USDA plant
hardiness zones 3a through 4b, although in New England the region extends into zone 5a. The forest region is adapted to the
Humid continental climate with warm, humid summers and cold, snowy winters. The
Köppen climate classification is Dfb. During the lumbering era, unrestricted logging and the resulting fires destroyed much of the forest. With the advent of fire suppression and forest management, the resulting
second-growth forest differed substantially from the original forest cover. Conifer tree species became less common in the resulting forest. Early successional tree species such as aspen and birch became much more prevalent and replaced much of the mixed conifer and deciduous forests that originally existed prior to the logging era. Major animal species inhabiting the forest include
white-tailed deer,
moose,
porcupine,
beaver,
American red squirrel,
eastern gray squirrel,
chipmunk,
opossum,
raccoon,
bobcat,
Canada lynx,
fisher,
American marten,
long-tailed weasel,
ruffed grouse,
spruce grouse,
bald eagle,
red-tailed hawk,
osprey,
common loon,
mallard,
Canada goose,
wild turkey,
sandhill crane,
snowshoe hare,
American black bear,
coyote, and
red fox. After being nearly
extirpated from the
conterminous United States,
gray wolves survived in the remote northeastern corner of Minnesota and Ontario. The
repopulation of wolves in this region has occurred naturally as they have expanded their territory. Lone
cougar have been documented moving through the region, but these appear to consist of solitary young males dispersing from the
Great Plains, and little evidence of breeding populations is currently known to exist in the region.
Elk have been reintroduced in northern Wisconsin, Michigan, and Ontario after having been extirpated prior to the 20th century by overhunting and habitat loss. The
boreal woodland caribou used to inhabit the American portions of the region, but with the destruction of the original forest during the late 19th and early 20th centuries and the resulting expansion of the white-tailed deer population (which carry the deadly
Parelaphostrongylus tenuis brain worm parasite), the species is confined to Canada.
Gallery of wildlife File:Moose superior.jpg File:BarredOwl.jpg ==See also==