survivorship curve: Quick Facts

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Photos

Graph showing three survivorship curves: Type I (red, with human figures) has high survival early and drops steeply at old age; Type II (blue, with a bird) declines steadily; Type III (green, with a plant) drops sharply early, then levels off. X-axis is age, y-axis is number of survivors on a log scale.

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Topics

Type I survivorship curve Type III survivorship curve Type II survivorship curve population minimum viable population age distribution Abundant Animals: The Most Numerous Organisms in the World Population density population pyramid Population growth species abundance Why Is Japan’s Population Decreasing?vital rates density-dependent factor

Key People

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John Graunt

English statistician