BIO120H1 Lecture Notes - Lecture 20: Island, Pisaster, Gonad
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BIO120H1 Full Course Notes
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Document Summary
Lecture 20: species interactions from 2-species population. Those who welcome death, have only tried it from the ears up. Our taking off point for today is lecture 18, to non-aged structure models, but adding a complication of multiple species. In a technical sense, we"re moving from population ecology to community ecology of the embryonic type. Community structure: competition, resource use, and niche overlaps. Types of interactions are classified (+ or -) by who suffers and who benefits (essentially based on the interaction between two species). Consumer-resource (+/-) asymmetrical interactions: predator-prey, plant-herbivore, host-parasite. Subset of consumer-resource interactions, where one species is deriving its nutrition from another species. To be continued they don"t lend themselves to the simple modelling work. Competition (-/-) symmetrical relationship: two species competing for some resource that"s potentially in short supply. Mutualism (+/+) symmetrical relationship: plants and pollinators. Population dynamics (ecological effects on n"s, can species coexist?) Basic model: lotka-volterra equations for two species competing for resources.
