BIO120H1 Lecture Notes - Lecture 9: Temperate Deciduous Forest, Pioneer Species, Secondary Succession
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BIO120H1 Full Course Notes
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Lecture 9: spatial eco, plant communities, and disturbance. Community dynamics: predictable successional change in plant communities. Pioneer species get in first(from dispersal or seed bank soil) Soil-building processes and shade thought to be critical. Old-field previously farm lands, succession from abandoned land to forest. Vegetation changes spontaneously as the vegetation itself modifies the environment. Pioneer species first to appear in the habitat (good at dispersing, r-strategists) Climax stage stable equilibrium, no more change. Primary succession new substrate created, no pre-existing vegetation; substrate new material that will become soil afterwards. Secondary succession more often to occur, pre-existing vegetation undergoes a disturbance, like fire, in which it was destroyed. Disturbance = discrete event that causes abrupt change in ecosystem, community, population; sets back succession. Example of secondary succession: temperate deciduous forest biome, joker"s hill or koffler scientific. Reserve, north of toronto: abandoned agricultural fields and pastures. 1) annual dormant weeds require light for growth.
