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POPULATION DENSITY, DISTRIBUTION &
GROWTH
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Density is a measure of how closely packed organisms are in a population Calculated by …
DENSITY
# of individualsarea (units2)
= population density
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Distribution refers to how organisms are spaced out in their habitat
DISTRIBUTION
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A population’s size changes are the result of 4 factors Births, deaths, immigration, emigration
Births and immigration increase size Deaths and emigration decrease size
GROWTH
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Population growth is first influenced by available resources Food, water, territory
Populations grow exponentially if resources are unlimited
GROWTH
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Resource limitations eventually slow a population’s growth Logistic growth has a “leveling off” period of time
Population reaches itscarrying capacity
Carrying capacity = maximum # of individualshabitat can support
GROWTH
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Limits to growth fall into two categories Density dependent limiting factors
Increase their pressure as population size grows Examples: predation, competition, disease
Density independent limiting factors Pressure remains constant regardless of population size Examples: weather, natural disasters, seasonal changes
LIMITS TO GROWTH