BIO120H1 Lecture Notes - Lecture 20: Interspecific Competition, Intraspecific Competition, Logistic Function
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BIO120H1 Full Course Notes
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Lecture 20 - species interactions: from 2-species population models to community structure. Community structure: competition, resource use, and niche overlaps. Types of interaction classified (as + or -) by who suffers and who benefits\ Negative: one depress the growth of the other. One depriving resource of the other; depress prey population. Population dynamics (ecological effects on n"s, can species coexist?) Basic model: lotka-volterra equations for two species competing for resources. Logistic already a has braking term for intraspecific competition within a species. Just add a second braking term for interspecific competition between species. Given two species, lv model for species 1: Rewrite logistic with subscripts to indicate species 1. = competition coefficient (braking term for sp 2, i. e. effect on sp 1 by sp 2) Ij = per-capita effect on i by j = competition coefficient . If = 0, no competition b/w species. If = 1, species using resources at same rate.
