BIO120H1 Lecture Notes - Lecture 19: Survivorship Curve, Summary Statistics, Evolutionary Medicine
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BIO120H1 Full Course Notes
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Alternative life history tradeoffs, cost of reproduction. Typical life history for higher plants and animals. Start life at a small size, grows for a period without reproducing. When they have enough resources, they become mature and start spending the resources on reproduction. Organisms show various lifestyles after sexual maturity. Need to consider age structure of populations to: But now, fecundity and survivorship vary with age. Variations summarized by life tables of age-specific rates. If births and deaths stay constant, pyramid shape is stable but human birth rates are always changing. The babies are at the bottom and age goes up from there as time goes on. Human population birth rates affected by world war 1 and world war 2. 2001: declining population, economic factors and birth control affecting birth rates. Each age group decreases as they get older because some individuals don"t make it. Females are the only ones that produces children.
