BIOL 308 Lecture Notes - Lecture 13: Exponential Growth, Herbivore, Seed Dispersal
5 Mar 2018
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Document Summary
Two modes of transmission: water-borne transmission and human-human transmission. Infection is limited by dispersal as you can see. The density of the host determines the success of transmission. In the fungus model, we replace host density by mean distance from a plant to is neighbouring hosts. Mystery: the disease was able to propagate in the uk in spite of the fact that population density was way below the threshold of persistence. Explanation: they observed a pattern with school demographic movement as school ended the disease infected more people: people in the city (infected core) moved in rural areas for holidays, temporarily increasing the density of infected people around there. Challenge in population biology: if you make a simple model, and make an experiment you expect the pest to collapse. One assumption that is not met in the model is discrete time dynamics. There are non- o(cid:448)erlappi(cid:374)g ge(cid:374)eratio(cid:374)s of the pest. This (cid:373)ea(cid:374)s that the (cid:373)odel (cid:272)a(cid:374) (cid:862)o(cid:448)ershoot(cid:863) a lot.
