APES Unit 3

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Type III survivorship

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A pattern of survival where there is low survivorship early in life, with few individuals reaching adulthood.

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Carrying Capacity

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The maximum population size that an environment can sustain indefinitely without being degraded.

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Population density

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The number of individuals of a species per unit area or volume.

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Density-Independent factors

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Factors that affect all populations similarly regardless of population size.

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Type I survivorship

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A pattern of survival that tracks organisms with low death rates and high survivorship rates early in life, with a dramatic increase in death rate toward the end of their life expectancy.

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Type II survivorship

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A type of survivorship where organisms have equal chances of dying at any age throughout their life.

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Biotic potential

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The maximum reproductive capacity of an organism under optimal environmental conditions.

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Environmental resistance

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The sum of environmental factors that limit the growth of a population.

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Logistic growth model

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A model of population growth that describes how a population grows more slowly as it approaches its carrying capacity.

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Exponential growth model

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A model of population growth that describes how a population grows rapidly when resources are abundant.