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emery_lecture_25 - Lecture 25 I What is community stability...

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Lecture 25 I. What is community stability - stability = tendency of a community to return to its original state after a perturbation - perturbations: fire, volcano, grazing/predation, invasive species, extinction Types of stability - resilience = speed with which a community returns to its original state after - resistance = ability of a system to avoid being displaced in the first place - can be resilient but not resistant or resistant but not resilient Neighborhood stability – returns to original state after small disturbance Global stability – returns to original state after large disturbance local: global: II. Complexity – Stability Hypothesis increase species richness (S), connectance (C), strength of interactions Charles Elton (1920s) - island north of Norway huge fluctuations - assumed tropics didn’t fluctuate - “conventional wisdom” – diversity promotes stability 1. Math models of simpler systems showed it was hard to achieve stability 2. lab experiments show it is hard to maintain populations of a few species
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