13 terms

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population density
the number of individuals per unit area. tremendously depending on the species and its ecosystem.
immigration
the movement of individuals into an area, another factor that can cause population to grow.
emmigration
the movement of individuals OUT of a population, can cause a population to decrease.
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
of the environment for a particular species.
limiting factor
a factor that causes population growth to decrease.
density-dependant limiting factor
a limiting factor (includes competition, predation, parasitism, and disease) that depends on population size.
predator- prey relationship
one of the best-known mechanisms of population control.
density-independent limiting factor
affect all populations in similar ways, regardless of the population size. examples are unusual weather, natural disasters, seasonal cycles, and certain human activities like damming rivers and clear-cutting forests.
demography
the study of human populations that examine the characteristics of human populations and attempts to explain how those populations will change over time.
demographic transition
a dramatic change in birth and death rates.
age-structure diagram
population profiles, which graph the numbers of people in different age groups

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