Definitions
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| Demography | The study of populations.
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| Growth rate | In a population, the number of new individuals that are produced in a given amount of time minus the number of individuals that die.
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| Intrinsic growth rate (r) | The highest possible per capita growth rate for a population.
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| Exponential growth model | A model of population growth in which the population increases continuously at an exponential rate.
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| J-shaped curve | The shape of exponential growth when graphed.
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| Geometric growth model | A model of population growth that compares population sizes at regular time intervals.
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| Doubling time | The time required for a population to double in size.
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| Density independent | Factors that limit population size regardless of the population's density.
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| Density dependent | Factors that affect population size in relation to the population's density.
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| Negative density dependence | When the rate of population growth decreases as population density increases.
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| Positive density dependence | When the rate of population growth increases as population density increases. Also known as inverse density dependence or the Allee effect.
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| Self-thinning curve | A graphical relationship that shows how decreases in population density over time lead to increases in the size of each individual in the population.
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| Carrying capacity (K) | The maximum population size that can be supported by the environment.
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| Logistic growth model | A growth model that describes slowing growth of populations at high densities.
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| S-shaped curve (sigmoidal curve) | The shape of the curve when a population is graphed over time using the logistic growth model.
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| Inflection point | The point on a sigmoidal growth curve at which the population achieves its highest growth rate.
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| Age structure | In a population, the proportion of individuals that occurs in different age classes.
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| Life tables | Tables that contain class-specific survival and fecundity data.
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| Stable age distribution | When the age structure of a population does not change over time.
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| Generation time (T) | The average time between the birth of an individual and the birth of its offspring.
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| Cohort life table | A life table that follows a group of individuals born at the same time from birth to the death of the last individual.
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| Static life table | A life table that quantifies the survival and fecundity of all individuals in a population during a single time interval.
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