BISC208 Chapter Notes - Chapter 51: Exponential Growth, Density Dependence, Logistic Function
17 Feb 2018
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Demography: = study of factors that determine the size and structure of a population, how does a population grow / decline, grow @ birth / immigration, decline @ death / emigration. Logistic growth: rapid increase, starts to slow, then levels off, dn / dt = r x n x (k-n / k, dn/dt = instantaneous growth. When n is small and k is large. 2: resources (food availability, space (amount of land; e. g. overcrowding, antagonists: predation, diseases, life expectancy and generation rate, climate change (migration, etc. ) Predator-prey: in predator-prey relationships the population growth curves end up looki(cid:374)g (cid:373)ore like , populations alternate growth, growing and dropping of population growth curve, if populatio(cid:374) gets too low, (cid:271)ottle(cid:374)e(cid:272)k will happe(cid:374); graph wo(cid:374)"t rebound easily, e. g. Hare lynx cycle alternates every 10 years; one population grows, the other drops, and vice versa: hu(cid:373)a(cid:374) i(cid:374) e(cid:454)po(cid:374)e(cid:374)tial growth; has(cid:374)"t dropped (cid:455)et.
