Density-Dependent Factors
Immigration
Population Density
Random Population Dispersion
Carrying Capacity (k)
Emigration
Zero population growth (ZPG)
population growth rate (PGR)
Clumped Population Dispersion
Uniform Population Dispersion
Density-Independent Factors
Dispersion
K Strategist
R Strategists
the pattern of spacing of a population
how fast a given population grows Population Growth Rate = Birth + Immigration – Emigration – Death
Any factor in the environment that depends on the number of members in a population per unit area
Any factor in the environment that does NOT depend on the number of members in a population per unit area
Number of Individuals Moving Into a Population
Short life span Small body size Reproduce quickly Have many young Little parental care Ex: cockroaches, weeds, bacteria
The number of organisms in an area
The maximum population size that can be supported by the available resources
Number of Individuals Moving Out of a population
Long life span Large body size Reproduce slowly Have few young Provides parental care Ex: humans, elephants
occurs when the birthrate equals the death rate
