21 terms

Miller and Levine Biology Chapter 5

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Population Density
Refers to the number of individuals per unit area.
Age Structure
The number of males and females of each age a population contains.
Immigration
When individuals move into its range from elsewhere.
Emigration
When individuals move out of the population's range.
Exponential Growth
Rapid growth--the larger a population gets, the faster it grows.
Logistic Growth
occurs when a population's growth slows down and then stops. Happens after a period of exponential growth.
Carrying Capacity
The maximum number of individuals of a particular species that a particular environment can support.
Limiting Factor
A factor that controls the growth of a population.
Density Dependent Limiting Factor
Limiting factor that depends on population density.
Density Independent Limiting Factor
Limiting factor that affects all population in similar ways, regardless of population density.
Demography
The scientific study of human populations.
Demographic Transition
Dramatic change from high birth rates and death rates to low birth rates and death rates.
3 phases of growth
exponential growth, growth slows down, growth stops.
3 stages of demographic transition
1. equally high birth and death rates 2. death rate begins to fall but birth rates remain high for a time 3. Birth rate falls to meet the death rate
Natality
another word for birth rate
Mortality
another word for death rate
Examples of density dependent limiting factors
resources, disease and parasites, competition, predation, emigration, and immigration.
Examples of density independent limiting factors
natural disasters, sunlight, temperatures, human activities,
Thomas Malthus
predicted only war, famine, and disease could limit human growth.
Population
group of individuals that live in the same area and belong to the same species.
Age structure diagrams
used by demographers to predict what/how the human population will grow over time.