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IGHS Winkels
Biology Chapter 5
Term | Definition |
---|---|
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 |