Population Pressures : Glossary

There are 74 documents in this section.

  • Ecology

    16 March 2001

    Originally defined by Ernst Haeckel in 1866, ecology is the study of the relationships that develop among living organisms and between these organisms and the environment.

  • Conservation (nature)

    9 March 2001

    Protection against irreversible destruction and other undesirable changes, including the management of human use of organisms or ecosystems to ensure such use is sustainable.

  • Abortion Rate

    29 August 2000

    The number of abortions per 1,000 women aged 15-44 or 15-49 in a given year.

  • Age-Dependency Ratio

    29 August 2000

    The ratio of persons in the ages defined as dependent (under 15 years and over 64 years) to persons in the ages defined as economically productive (15-64 years) in a population.

  • Ageing of Population

    29 August 2000

    A process in which the proportions of adults and elderly increase in a population, while the proportions of children and adolescents decrease. This process results in a rise in the median age of the population. Ageing occurs when fertility rates decline while life expectancy remains constant or improves at the older ages.

  • Birth Rate (or crude birth rate)

    29 August 2000

    The number of live births per 1,000 population in a given year. Not to be confused with population growth rate.

  • Carrying Capacity

    29 August 2000

    The maximum sustainable size of a resident population in a given ecosystem.

  • Contraceptive Prevalence Rate

    29 August 2000

    Percentage of couples currently using a contraceptive method.

  • Dependency Ratio

    29 August 2000

    The ratio of the economically dependent part of the population to the productive part; arbitrarily defined as the ratio of the elderly (ages 65 and older) plus the young (under age 15) to the population in the working ages (ages 15-64).

  • Fertility

    29 August 2000

    The actual reproductive performance of an individual, a couple, a group, or a population.