Download 8.1 Notes "Populations"

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Transcript 
Populations
Mr. Haase
What is a population?
• All members of a species living in the same
place at the same time
Properties of Populations
• Densitynumber of individuals
per unit area
• Dispersionarrangement of
individuals in given
space
How do you measure population
growth?
Change in
Population
size
= Births - Deaths
Reproductive Potential
• Maximum number of offspring each member
of a population can produce
Exponential Growth
What limits overpopulation?
• Carrying capacity- maximum population an
ecosystem can support
Factors that limit population growth
• Resource Limits
• Competition
Population Regulation
Density Dependant
• When deaths occur
more quickly in
crowded populations
Density Independent
• Deaths occur regardless
of population density
Examples:
Black Plague
Pine Beetle
Examples:
Severe Weather
Natural Disasters
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