Lec28_LifeHistoryHandout - BioEE 1780 Evolutionary Biology...

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BioEE 1780 Fall 2010 Evolutionary Biology Today’s lecturer: Mike Webster Life History Evolution Textbook Reading: Chapter 13 A. Life History: An individual’s lifetime pattern of allocation of time and energy to fundamental activities such as growth, repair, and reproduction. B. Life History theory is based on the assumption of tradeoffs between different life history components Trade-offs come from biological and physical limits , as well as costs and benefits of different strategies • Examples of such trade -offs: • Allocation to survival versus reproduction • Allocation to current versus future offspring Allocation to growth versus reproduction C. Example: How many young to produce? • Several hypotheses 1. Hypoth 1: parents maximize # of young fledged per nest/litter (tradeoff between number of young and offspring survival) 2. Hypoth 2: parents maximize quality of young (tradeoff between number of young and offspring quality) 3. Hypoth 3: parents maximize # of young fledged over entire lifetime (tradeoff between current and future reproduction) • Experimental tests needed to av oid confound of parental resources/condition • Both hypotheses 2 and 3 supported. D. Example: How many young to invest in reproduction?
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This note was uploaded on 12/29/2010 for the course BIOEE 1780 at Cornell University (Engineering School).

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Lec28_LifeHistoryHandout - BioEE 1780 Evolutionary Biology...

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