Prentice Hall Biology Chapter 5 (Populations)
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14 Terms
population density
the number of individuals per unit area
immigration
the movement of individuals into an area
emigration
the movement of individuals out of a area
exponential growth
when the individuals in a population reproduce at a constant rate
logistic growth
when a populations growth slows or stops following a period of exponential growth
limiting factor
the factor that causes population growth to decrease
density-dependent limiting factor
a limiting factor that depends on population size: competition, predation...
density-independent limiting factor
factor that affects all populations in similar ways regardless of population size: volcanoes, earthquakes...
demography
the scientific study of human populations
demographic transition
a change in birth and death rates
age-structure diagrams
population profiles detailing sex, age, and number of individuals, often in the form of a pyramid
carrying capacity
the maximum population that an ecosystem can support
things that increase a population
increased birth rate and immigration
things that decrease a population
increased death rate and emigration