BIOLOGY 2F03 Lecture 12: Ch. 12 – Population Dynamics and Growth
11 Dec 2015
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Populatoin size changes as a function of birth rates, death rates, immigration and emigration. Theses processes may be either density independent or density dependent. Nt+1 = nt + b + i d e. Useful for determining whether population is changing overtime. If . you want to compare between 2 populations use the Per capita rates of birth, death, immigration, emigration and the total number of individuals that are born, die, immigrate or emigrate. Nt+1 : size of the population at some future time (one step in the future) Nt : size of population at time t. Per capita rate: the rate of some ecological processes (eg. births) divided by the number of individuals in a population. Ex. in a population of 100 individuals that produced 10 offspring during a time interval, the per capita birth rate would be 0. 1 offspring perindividual, pertime interval. Nt+1 = nt + ntb + nti - nt d - nte.
