BIOL 230 Chapter Notes - Chapter #4: Exponential Growth, Doubling Time, London Academy Of Music And Dramatic Art
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Populations can grow quickly if generally populations leave an average of more than 1 offspring over substantial periods of time. Per capita birth death rate is like birth or death rate per individual (# of births or death divided by # of individuals in pop). Gives you a sense of whether the # of births/deaths is high or not. Geometric growth: if a population of species changes in size by a constant proportion from one discrete time period to the next: ex: in cicadas and annual plants reproduce in synchrony at regular time intervals. Theses regular time intervals are called discrete time periods: population grows by constant proportion. Nt is pop size after t generations/discrete time period. Is any # greater than 0. Serves as multiplier that allows us to predict size of population in next time period. Whe(cid:374) it"s (cid:271)/(cid:449) 0-1, population decreases over time.
