BIO120H1 Lecture Notes - Lecture 20: Interspecific Competition, Intraspecific Competition, Evolutionary Dynamics
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BIO120H1 Full Course Notes
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Document Summary
Types of interaction classified (as + or -) by which population suffers and which one benefits. Predator-prey (e. g. , predators benefit from prey, prey suffer from predators) Competition (-/-) each is hurt by the other. Mutualism (+/+) each is helped by the other. Population dynamics (ecological effects on n"s, can species coexist?, epidemiological models of disease) Basic model: lotka-volterra for two species competing for resources. Simple outgrowth of logistic equation: logistic already a has braking term for intraspecific competition within a species just add a second braking term for interspecific competition between species. Expect now to solve for n1 and n2 as f(t), but Species 1 may always win (n1 = k1, n2 = 0) species 2 may always win (n2 = K2, n1 = 0) identity of winner may depend on starting n"s. Outcomes depend on values of k"s and "s. Coexistence requires both species to inhibit their own growth more than they inhibit each other"s.
