Topic 13 - Exponential Growth (BIOL 2300)
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closed population
no immigration
no emigration
births increase population size
deaths decrease population size
to determine a change in pop. size (N) from one point in time to sometime later (equation)
N(later) = N (now) + Births - Deaths
difference between population growth models and life tables
population growth models: used to estimate pop. size many gens. in the future
life tables: used to determine pop. growth from one generation to the next generation
underlying assumptions - exponential model
all ind.s have the same birth (b) and death (d) rates
b and d are constant through time
births and deaths occur continuously throughout year
no migration (I or E) - the population is closed
resources are unlimited
geometric model assumes..
discrete breeding (pop only grows during breeding season) but similar equation
why has the human population size not leveled off?
medical advances (decreased d, increased b)
technological advances (agriculture, aquaculture ~ unlimited food supply)
other reasons?
Note 
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