BIOL 308 Lecture Notes - Lecture 14: Logistic Function, Time Series, Exponential Growth
5 Mar 2018
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Document Summary
Stepping back to the level of population leave species interactions. Oscillations in predator-prey dynamics we know where they are coming from. This idea suggests that populations may not be at stable equilibrium all the time. Demographic stochasticity: chance events of individual mortality and reproduction that are independent among individuals. (the probability that one individual has bad luck is. 0. (cid:1007), the pro(cid:271)a(cid:271)ilit(cid:455) that (cid:1006) i(cid:374)di(cid:448)iduals ha(cid:448)e (cid:271)ad lu(cid:272)k is 0. (cid:1007)*0. (cid:1007) for 80 i(cid:374)di(cid:448)iduals the probability is going to be very small) it has a larger effect on small populations than on large ones. Environmental stochasticity: temporal fluctuations in the probability of mortality and reproduction of all individuals in the population. (cid:894)it does(cid:374)(cid:859)t (cid:373)atter (cid:449)hether the population is 80 individuals or (cid:1006)00 or 500 (cid:895) has similar effects on small and large populations. Measurement error: errors in estimates of population size or density based on sampling procedure. Populations of birds: y-axis: frequency of observation x-axis: individual fitness.
