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Definition
| Maximum population of a particular species that a given habitat can support over a given period. |
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Term
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Definition
| All the limiting factors that act together to limit the growth of a population. |
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Term
| intrinsic rate of increase (r) |
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Definition
| Rate at which a population could grow if it had unlimited resources. |
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Term
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Definition
| Species that produce a few, often fairly large offspring but invest a great deal of time and energy to ensure that most of those offspring reach reproductive age. Compare r-selected species. |
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Term
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Definition
| Number of organisms in a particular population found in a specified area or volume. |
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Definition
| Variation of population density over a particular geographic area. For example, a country has a high population density in its urban areas and a much lower population density in rural areas. |
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Term
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Definition
| Species that reproduce early in their life span and produce large numbers of usually small and short-lived offspring in a short period. Compare K-selected species. |
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Term
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Definition
| Graph showing the number of survivors in different age groups for a particular species. |
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Term
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Definition
| Percentage of the population (or number of people of each sex) at each age level in a population. |
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Term
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Definition
| Annual number of live births per 1,000 people in the population of a geographic area at the midpoint of a given year. |
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Term
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Definition
| Annual number of deaths per 1,000 people in the population of a geographic area at the midpoint of a given year. |
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Term
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Definition
| Hypothesis that countries, as they become industrialized, have declines in death rates followed by declines in birth rates. |
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Term
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Definition
| Providing information, clinical services, and contraceptives to help people choose the number and spacing of children they want to have. |
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Term
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Definition
| The number of births that occur to an individual woman or in a population. |
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Term
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Definition
| Number of babies out of every 1,000 born each year that die before their first birthday. |
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Term
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Definition
| Average number of years a newborn infant can be expected to live. |
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Term
| replacement-level fertility |
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Definition
| Number of children a couple must have to replace them. The average for a country or the world usually is slightly higher than 2 children per couple (2.1 in the United States and 2.5 in some developing countries) because some children die before reaching their reproductive years. |
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Term
| total fertility rate (TFR) |
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Definition
| Estimate of the average number of children who will be born alive to a woman during her lifetime if she passes through all her childbearing years (ages 15-44) conforming to age-specific fertility rates of a given year. In simpler terms, it is an estimate of the average number of children a woman will have during her childbearing years. |
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