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Jon Abbatt (10)
Lecture 9

lecture 9 notes from prof. Thomson

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Jon Abbatt

Lecture 9: Spatial ecology, plant communities, and disturbance  Disturbance: An event that causes rapid or marked change in a population or community often thought of as displacing an ecological system from its equilibrium.( E.g.: fire, windstorm, logging, agriculture)  Succession: a regular sequence of changes in the species composition of a community in a newly forms or disturbed habitat that progresses to a stable state.  Climax community: the end point of a successional sequence, or sere; a community that has reached a steady state under a particular set of environmental conditions  Sere: a series of stages of community change in a successional sequence leading toward a stable state  Primary succession: new substrate created, no pre-existing vegetation  Secondary succession: pre-existing vegetation undergoes a disturbance Stages of successional change 1. Soil development: solid lava breaks down into finer particles, dead plants contribute organic matter. 2. Plants attract birds; birds bring in seeds 3. Herbaceous plants cover ground, trees grow 4. Tree canopy closes in, soil is well developed, and shade becomes important Secondary succession in temperate deciduous forest biome: Koffler Scientific Reserve  Old-field succession, year 1: Annual weeds  Old-field succession, stage 2: Perennial weeds  Old-field succession, stage 3: Woody shrubs move in  Old-field succession, stage 4: Tree saplings  Old-field succession, stage 5: Tree canopy closes in  Old-field succession, stage 6: Shrub layer thins out  Old-field succession, stage 7: Only shade-tolerant spp. remain Drivers of ter
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