BIO120H1 Lecture Notes - Lecture 20: Interspecific Competition, Intraspecific Competition, Logistic Function

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6 Sep 2018
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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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Lotka-volterra model of competition: extension of logistic. Empirical testing: gause"s early experiments with protozoa. One view of community structure: competition, resource use, and niche overlaps. Types of interaction classified (as + or - ) by who suffers and who benefits: Population dynamics (ecological effects on n"s, can species coexist?) Basic model: lotka-volterra equations for two species competing for resources. Logistic already has a braking term for intraspecific competition within a species. Just add a second braking term for interspecific competition between species. Lv outcomes became widely interpreted as basically unstable. Often phrased as complete competitors cannot coexist . Because various external factors can prevent even unstable competition from going to. This is true for the simple math models, but not so true in nature completion. Good description of competition by protozoa in artificial cultural vessels; saw both stable coexistence and competitive exclusion: can often be unstable.

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