BIO120H1 Lecture 7: lecture 7 notes from prof. Thomson

• School: UTSG
• Department: Biology
• Course: BIO120H1
• Professor: Jon Abbatt

Document Summary

Lecture 7: species interactions: from 2-species population models to community structure. Types of interaction classified by who pays and who benefits. Consumer-resource (+/-, ricklefs treats first: predator-prey, plant-herbivore, host-parasite. Lotka-volterra equations intraspecific competition: competition between individuals of same species interspecific competition: competition between individuals of different species. The two species may stably coexist: coexistence requires both species to inhibit their own growth more than they inhibit each other"s. Species 1 may always win (n1 = k1, n2 = 0: can expand to consider n species. Species 2 may always win (n2 = k2, n1 = 0) Identity of winner may depend on starting n"s. Stated that two species cannot coexist indefinitely when the same resource limits both species ( : only true for math model, coexist do exist in nature!!! Depends on species, he can get both stable coexist, and competitive exclusion.