BIOA02H3 Lecture Notes - Lecture 5: Exponential Growth, Logistic Function, Carrying Capacity
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Key: they interact negatively with other member in the species. Populatio(cid:374) gro(cid:449)th rate: (cid:272)ha(cid:374)ge i(cid:374) the (cid:374)u(cid:373)(cid:271)er of i(cid:374)di(cid:448)iduals (cid:894) n(cid:895) o(cid:448)er ti(cid:373)e (cid:894) t(cid:895) Two types: exponential growth (density independent, growth rate does not depend on number of individuals, usually occurs when species , colonize new habitat, recolonize habitat (after local extinction) Rabbits in australia: 20 rabbits introduced in australia in late 1800s, quickly became invasive, population size reached millions by early 1900s. We can also express this equation in terms of per capita (per individual) rates of birth (b) and death (d) If we let r = b d, we can simplify this equation. Here, r = the population growth rate in an unlimited environment r is also referred to as the intrinsic growth rate, because it is the instantaneous growth rate when resources are not limited. To estimate future population sizes, we will need to use a different equation. Nt = future population size (at time t)