BIO120H1 Lecture Notes - Lecture 22: Discrete Event Simulation, Understory, Primary Succession
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BIO120H1 Full Course Notes
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R-strategists pioneer species: requires good dispersal, usually sheds leafs annually! Classic view of successional sequence: pioneer species! 2. temporary, non-equilibrium stages: climax stage, stable equilibrium, no further changes! Primary succession: new substrate creases, no pre-existing vegetation, ex. glacier retreat, volcano eruption! Secondary succession: pre-existing vegetation goes through disturbance (soil is there but organisms are removed), most usual type of succession! Disturbance: discrete event that causes abrupt change in ecosystem, community population; sets back succession: ex. Example: primary succession in hawaii: volcano erupted, new seeds and spores blown in, soil development! Dead plants becomes organic matter, soil becomes complex! Allowing more plants to be established: plants attracts birds, birds bring in seeds, trees grow, canopy closes in, shade is an important factor, soil is well-developed! Drivers of terrestrial succession: soil development: accumulating of organic matter (n, ph buffering, water retaining capacity) especially important in primary succession!
