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Ecology 7

Mrs Williams

on 12 September 2010

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Transcript of Populations


Population density is the number of individuals per unit of area.
Three factors that can affect population size

Number of births
Number of deaths
Number of individuals that enter or leave the population
mmigration = the movement of individuals
nto an area

Emigration = the movement of individuals out of an area
Exponential Growth occurs when the individuals in a population reproduce at a constant rate. (Ideal conditions) (J shaped curve)

Logistic Growth occurs when the individuals in a population's growth slows or stops following a period of exponential growth.
(S shaped curve)
Why is there a stationary phase?
When a population stops growing, it has reached its carrying capacity.
is this population's
carrying capacity
. It is the number that represents the largest number of individuals that its environment can support.
J shaped curve
S shaped curve
Full transcript