Ch11 Population Growth and Regulation4.pdf

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University College Courses
Spencer Barrett

 stable age distribution and constant growth rate achieved by a particular pop. depend on the age-specific survival and fecundity rates of its indiv. o any change in those rates alters the stable age distribution and results in a new rate of pop. growth  # of indiv. at time t, n (x), 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: n (t) = n (x-1)s x-1 x  # of indiv. in each age class was multiplied by its fecundity to obtain the # of new borns: n (0) = Σn (x)b x  age structures of human pop. represented by pop. pyramids A Life Table Summarizes Age-Specific Schedules of Survival and Fecundity  life tables 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 (s ),xFecundity (b ), Nxmber of Individuals (n ) x  x = max. age, s = x  x = 0, b x 0  when reproduction occurs during a brief reproductive season each year, each age class is composed of a discrete group of indiv. born at approx. the same time  when reproduction is continuous (ex. humans), each age class can be designated arbitrarily as comprising indiv. b/w ages x - ½  the ffecundityof females is often expres
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