BIOL 2903 Lecture Notes - Lecture 2: Polar Bear Provincial Park, Hudson Bay Lowlands, Algonquin Provincial Park
14 Feb 2017
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Document Summary
Large bodies of water modify land temperatures & winds. Continues to change face of ontario keeps flowing & moving. Evidence of its power in past in rocks: erratic rocks = boulders, striations (scratches) on rocks. Over past million yrs, ice covered all of ontario several times: ice age (the pleistocene) Isostatic rebound: when land masses that were depressed by weight of ice sheets during glacial period rise. Glaciers scoured rocks & destroyed all life in ontario. Only small drop in avg temperature can spawn glaciers. Lichens come onto bare rocks: symbiotic relationships b/w fungi & algae, provide living place for other plants, initiate succession (change through time of biodiversity, crustose lichens: colonize bare rock, pioneer species. Can"t be scratched off rock, get nutrients from air. Start whole process off: foliose lichens = leaf-like, fruticose lichens often very small, arboreal lichens grow on trees. Mosses often grow w/ lichen, but they can also be colonizers (pioneer species)
