BIOL150 Lecture Notes - Prairie Dog, Overgrazing, Wolverine
3 Feb 2013
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Solifuction = freezing and thawing of surface soil + water + gravity moves soils down slopes. N america: southern canada to gulf of mex. Deciduous has low seasonal variation in prec. Peak in prec coincide with peak in temp. Neutral, slightly acidic in ph rich in org matter and inorganic nutrients. Animals: caribou, reindeer, musk, ox, bear, wolves, fox, weasel, lemming, ground squirrel. Mosses and non-vascular plants on base of trees and forest floor steep vertical gradient in color and intensity. Animals: migratory caribou and reindeer, mousse and woodland bison , wolves, bears, lynx, wolverine, snowshoe hare, porcupines, red squirrels , spring migrate birds. Plants: vertically stratified: herb layer>shrubs and saplings>shade-tolerant understory trees> canopy. Animals: deer mice, tree squirrels, flying squirrels > deer, bear, fox > bats and others (tree cavities) Plants: herbaceous veg, woody veg excluded by fire, drought and grazing; trees and shrubs along streams and rivers, up to 70 flowers bloom in spring.
