Introduction to Populations
Survivorship in Populations
Survivorship curves are graphic representations of the age structure of a given population. They are used to predict the future growth of the population. Type I curves reflect relatively low death rates early in life and through midlife, with a sharp increase in death rate among older-age groups (e.g., humans). Type II curves illustrate a fairly even mortality rate throughout the life span of the organism (e.g., birds). Populations with high death rates early in life followed by a sharp decline of death rates for the survivors are represented by Type III survivorship curves (e.g., fish and many insect populations).
- Ricklefs, R. E. & Miller, G. L. (2000). Ecology (4th ed.). New York: W.H. Freeman and Co.
- Campbell, N. E., & Reece, J. B. (2002). Biology (6th ed.). San Francisco: Benjamin Cummings.
- Young, M. (2004). Survivorship graph. Houston, TX: Baylor College of Medicine, Center For Educational Outreach.
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