Life Tables and Survivorship Curves: Concepts and Construction

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7 Terms

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Mortality, qx

The probability of dying between age x and x+1.

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Survivorship, lx

The proportion of individuals surviving to age x.

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Survival rate, sx

The proportion of individuals surviving from age x to age x+1.

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Age-specific life expectancy, ex

The average number of additional years an individual of age x is expected to live.

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Mortality Curve

A graphical representation of the mortality rates of a population over time.

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Survivorship Curve

A graph that represents the number of individuals surviving at each age for a given species or cohort.

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Type I, II, and III survivorship curves

Different patterns of survivorship that illustrate how mortality rates vary with age.