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Chapter 19
Vocabulary
| Term | Definition |
|---|---|
| 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
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