Survivorship Curves

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4 Terms

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Survivorship Curve

A graph that shows how many individuals in a group of the same age survive from birth to death.

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Type 1

  • Mostly found in K-selected species.

  • High survival rates because of strong parental care.

  • Good survival in middle age due to size and protection.

  • Rapid decline in survival as they get older.

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Type 2

  • Survival rates decrease steadily throughout life.

  • This type is in between r-selected and k-selected species.

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Type 3

  • Mostly found in r-selected species.

  • High death rates early in life because there’s little or no parental care.

  • Very few survive to middle age, with a slow decline in survival at that stage.

  • Even fewer reach adulthood, with a slow decline as they get old.