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IGHS Winkels

Biology Chapter 5

TermDefinition
Population Density the number of individuals per unit area
Immigration the movement of individuals into an area
Emmigration the movement of individuals out of an area
Exponential growth occurs when the individuals in a population reproduce at a constant rate
Logistic growth occurs when a population's growth slows or stops following a period of exponential growth
Carrying capacity the largest number of individuals that a given environment can support
Limiting factor a factor that causes population growth to decrease
Density-dependent limiting factor a limiting factor that depends on population size
Predator-prey relationship one animal kills another animal for food
Density-independent limiting factors Ex. unusual weather, natural disasters, seasonal cycles, and certain human activities such as damming rivers affect everyone
Demography the scientific study of human populations
Demographic transition a dramatic change in birth and death rates
Age-structure diagrams show the population of a country broken down by gender and age group
Created by: Winkels