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APES (Webster): Populations Flashcards

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6123827091Age structurePercentage of the population (or number of people of each sex) at each age level in a population.0
6123827092Baby boomAn increase in the number of children being born.1
6123827093Biotic potentialMaximum rate at which the population of a given species can increase when there are no limits on its rate of growth.2
6123827094Carrying capacity (K)Maximum population of a particular species that a given habitat can support over a given period.3
6123827095Crude birth rateAnnual number of live births per 1,000 people in the population of a geographic area at the midpoint of a given year.4
6123827096Crude death rateAnnual number of deaths per 1,000 people in the population of a geographic area at the midpoint of a given year.5
6123827097Cultural carrying capacityThe limit on population growth that would allow most people in an area or the world to live in reasonable comfort and freedom without impairing the ability of the planet to sustain future generations.6
6123827098Demographic transitionHypothesis that countries, as they become industrialized, have declines in death rates followed by declines in birth rates.7
6123827099EmigrationThe movement of a population out of an area.8
6123827100Environmental resistanceAll of the limiting factors that act together to limit the growth of a population.9
6123827101Exponential growthGrowth in which some quantity, such as population size or economic output, increases at a constant rate per unit of time. When the increase in quantity over time is plotted, this type of growth yields a curve shaped like the letter J.10
6123827102Family planningProviding information, clinical services, and contraceptives to help people choose the number and spacing of children they want to have.11
6123827103Fertility rateNumber of children born to an average woman in a population during her lifetime.12
6123827104GrayingPhenomenon in which a large portion of a population is entering their post-reproductive year.13
6123827106ImmigrationThe movement of a population into an area.14
6123827107Infant mortality rateNumber of babies out of every 1,000 born each year who die before their first birthday.15
6123827109Intrinsic rate of increase (r)Rate at which a population could grow if it had unlimited resources.16
6123827110K-selected speciesSpecies 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.17
6123827112Life expectancyAverage number of years a newborn infant can be expected to live.18
6123827113Logistic growthPattern in which exponential population growth occurs when the population is small, and population growth decreases steadily with time as the population approaches the carrying capacity.19
6123827114MigrationMovement of people into and out of specific geographic areas.20
6123827115Population dynamicsMajor abiotic and biotic factors that tend to increase or decrease the population size and affect the age and sex composition of a species.21
6123827116Population momentumAn increase in population due to large numbers of people entering their reproductive years.22
6123827117Population profileA histogram that shows the number of males and females in a given age range.23
6123827118Replacement-level fertility rateAverage number of children a couple must bear to replace themselves.24
6123827119r-selected speciesSpecies that reproduce early in their life span and produce large numbers of usually small and short-lived offspring in a short period.25
6123827121Survivorship curveGraph showing the number of survivors in different age groups for a particular species.26
6123827122Total fertility rate (TFR)An estimate of the average number of children that women in a given population will have during their childbearing years.27
6123827125Zero Population GrowthPhenomenon that occurs when birth rates equal death rates.28
6262678958Doubling TimeTime it takes (usually in years) for the quantity of something growing exponentially to double. It can be calculated by dividing the annual percentage growth rate into 70.29

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