BIOE 20C Lecture Notes - Lecture 18: Intermediate Disturbance Hypothesis, Primary Production, Ecological Niche
6 Apr 2018
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Week 10 tuesday lecture notes productivity disturbance habitat size. Intermediate disturbance hypothesis frequent disturbance = few species r selected species dominate: because they reproduce quickly rare disturbance = few species, k selected species dominate intermediate disturbance = higher spp, mix of r and k selected species. Area hypothesis large areas support more spp tropics only area with adjacent n/s hemisphere regions. More area = more spp supported more observational/experimental studies. Role of ecological diversity how does diversity affect: productivity, stability. Community productivity net primary productivity = npp: amount of plant material available to herbivores & decomposers. Q: how does spp. diversity affect npp spp. diversity increases npp. Community stability two measures resistance: measure of how much disturbances affects a community resilience: measure of how quickly a community recovers from disturbance diversity increases this. Dynamic equilibrium between: rates of colonization, rates of extinction. S = spp. number; as s increases rates of new spp colonization decrease rates of extinction increase.
