Evolution, Ecology and Behavior with Stephen C. Stearns - 11. Life History Evolution

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This course includes

27.3 hours of video
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Summary

Keywords

Life history aging maturity offspring reproduction growth lifespan tradeoffs environment diversity reaction norms mortality

Full Transcript

Principles of Evolution, Ecology and Behavior (EEB 122) Life history covers three main classes of traits in organisms: age and size at maturity, number and size of offspring, and lifespan and reproductive investment. Organisms must make tradeoffs among these traits that typically cause them to come to evolutionary equilibrium at intermediate values. Life history traits are evolutionary solutions to the ecological problems of the risk of mortality and the acquisition of food, and they are expressed in reaction norms that determine the particular traits that an organism will exhibit when its genes encounter a specific environment during development. 00:00 - Chapter 1. Introduction 04:53 - Chapter 2. Life History and the History of Ideas 08:56 - Chapter 3. Age and Size at Maturity 23:38 - Chapter 4. Size and Number of Babies 31:49 - Chapter 5. Lifespan and Aging 42:32 - Chapter 6. Summary Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses This course was recorded in Spring 2009.