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Population Size - Coggle Diagram
Population Size
Population Decline
emigration
Outbursts of infectious disease
sub-replacement fertility
low birth rates
High mortality rates
Population Growth
immigration (migration)
Expansion and Innovation
New habitats
developed technologies = increase carrying capacity of their habitats
sidestep limiting factors that traditionally restrain population growth
Fertility
total fertility rate
replacement fertility rate
Age Structure
reproductive base
Mortality rates (life expectancy) low
Population Regulation
Density-Independent Limiting factors
Flood
Hurricane
Volcanic eruption
Human Causing: Oil Spill
Density-Dependent limiting factors
Limited Resources
Predators
Parasitism & Disease
Selective Pressure Exerted by predation
Human
Atlantic Codfish
Nature
Guppies
Demographic
Demographic transition model
Vary among countries
Changes in birth/death rate as region becomes industrialized
Ex: developed countries
Lowest birth rate
lowest infant mortality
highest life expectancy
4 Stages
Preindustrial stage: Hard living conditions
Birth/death rate high
Growing rate low
Transitional stage
Food production/health care improve
death rate drops, birth rate declines slowly
Population growth increases
Postindustrial stage
Population growth becomes negative, birth rate falls below death rate
Population size slowly decrease
Industrial stage
industrialization
Birth rate declines
Move from rural to towns/cities
Smaller families/birth control
birth rate moves closer to death rate, population grows less rapidly
Consumption & Use of Resources
Developed countries use more resources
Less developed countries use less resources
Ecological Footprint