BIOL-208 Lecture Notes - Lecture 7: Climax Community, Pioneer Species, Pedogenesis
6 Dec 2017
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Document Summary
Succession : a directional change in the structure of community over time (community evolving over time) ex: re changes. During a succession nearly every aspect of the community structure. Climax community :late successional community that remains stable until disturbed. Disclimax community : a community only maintained through continual disturbances. Distribution along an environmental gradient (species changing as you go up a mountain) Primary :an evolution on newly exposed geological substrate (no previous plant communities) ex: on volcanic rock, glacial till steps: rock weathering ; soil formation ; successional stages. Secondary : follows a disturbance that does not destroy soil present. Happens after a disturbance like a re! regroup of forest soil is already. Explain how autogenic and allogenic processes initiate change in species- membership in a community. Autogenic: change is a result of species in the community (biotic factors) Allogenic :change is a result of physical environment (abiotic factors) List and explain the 3 models of the mechanisms of succession.
