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bio lect 31 - lect 31 demography measuring the population...

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lect 31 demography, measuring the population deaths and emigration take decrease pop. immigration and births increase pop. if teh average lifespan if teh ind. in the popultaion is greater then the time it takes to mature and reproduces, overlapping generations occur. age structure; geberation time; time between birth of individual and birth of offspring. if this period is short, what happens is much faster population growth becasue faster generation overlapping. proportion of individuals of each gender. (number of offsprings is stied to number of females,) in monogomous relationships - if number of males reduced, reproduction rate also decreases. harem - one male mating with multiple females. males are not directly correlated to offspring number because when teh head males dies, there will others to replace it. MORTALITY AND SURVIVORSHIP rate of increase depends on teh survivorship at teh different ages of individuals in teh population and the reproductive performance of individuals in the various age groups.
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