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Chapter 19


population a group of organisms of the same species that live in a specific geographical area and interbreed
population density the number of individuals of the same species that live in a given unit of area
dispersion in ecology, the pattern of distribution of organisms in a population
birth rate the number of births that occur in a period of time in a given area
death rate the number of deaths occurring in a period of time
life expectancy the average length of time that an individual is expected to live
age structure the classification of members of a population into groups according to age or the distribution of members of a population in terms of age groups
survivorship curve a graph of the mortality data of a population; indicates the probability that individuals will survive to any given age
growth rate an expression of the increase in the size of an organism or population over a given period of time
immigration the movement of an individual or a group to a new community or region
emigration the movement of an individual or group out of its native area
exponential model a model of population growth in which a constant and unlimited growth rate results in geometric increases in population size
limiting factor an environmental factor that prevents an organism or population from reaching its full potential of distribution or activity
logistic model a model of population growth that assumes that finite resource levels limit population growth
carrying capacity the largest population that an environment can support at any given time
density-independent factor a variable that affects a population regardless of the population density, such as climate
density-dependent factor a variable affected by the number of organisms present in a given area
inbreeding the crossing or mating of plants or animals with close relatives
hunter-gatherer lifestyle people who obtain their food by hunting and gathering wild animals and plants
agricultural revolution the change from a hunting and gathering society to an agricultural society that began about 10,000 years ago
developed country a modern, industrialized country in which people are generally better educated and healthier and live longer than people in developing countries do
developing country a country in which the society is less modern and less industrialized and in which inhabitants are generally poorer than they are in developed countries
demographic transition the general pattern of demographic change from high birth and death rates to low birth and death rates, as observed in the history of more-developed countries
Created by: FarlowA20