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PopulationsPopulationsHow they grow and what affects them
Characteristics of a Characteristics of a PopulationPopulationPopulation Density
◦How many organisms in a specific area
Geographic Distribution◦Where is the population located
Growth Rate◦How much is the population
changing
Growth RateGrowth RateFactors that affect the Growth
Rate◦# of births◦# of deaths◦Individuals leaving or entering the
population Immigration: Entering IN to a population Emigration: EXITING a population
Types of GrowthTypes of GrowthExponential
◦J Curve◦Reproduction happens at a constant
rate◦Happens under ideal conditions with
unlimited resources
Types of GrowthTypes of GrowthLogistical
◦S Curve◦Population continues to grow but at
a slower rate◦Happens when resources
become scarce
What did you say?What did you say?Carrying Capacity
◦This is the number of individuals a given environment can sustain for a specific population
Carrying Capacity!
Limiting FactorsLimiting FactorsWhat limits the growth of a
population?◦Density Dependent: Only become
limiting when the population reaches a certain level of density
◦Density Independent: Affect all of the populations in the same way.
Density DependentDensity DependentCompetitionPredationDiseaseParasites
Density IndependentDensity IndependentWeatherNatural disastersHuman Factors
◦Damming Rivers◦Deforestation ◦Controlled Burns
Human Population GrowthHuman Population Growth
World Population VideoWorld Population Video