UNI101Y1 Study Guide - Exclusive Or, Life Table
16 Feb 2013
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# of indiv. at time t, nx(t), x is age. Pop. was projected by multiplying the # of indiv. in each age class by the survival to obtain the # in the next older age class in the next time period: nx(t) = nx-1(t-1)sx. # of indiv. in each age class was multiplied by its fecundity to obtain the # of new borns: n0(t) = nx(t)bx. Age structures of human pop. represented by pop. pyramids. A life table summarizes age-specific schedules of survival and fecundity. Lliiffee ttaabblleess can be used to model the addition and removal of indiv. in a pop. (in the absence of immigration and emigration) Life tables are usually based on females since it is hard to ascertain paternity in many species. Life table: age (x), survival (sx), fecundity (bx), number of individuals (nx) X = max. age, sx = 0.
