BIO120H1 Lecture Notes - Lecture 6: Plants And Animals, Evolutionary Ecology, Fecundity
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BIO120H1 Full Course Notes
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Typical life history for higher plants & animals. Fecundity and survivorship vary with age: variation summarized by life tables of age specific rates. Important implications for: evolution of life histories, conservation of populations, human affairs. Summarized by age pyramids: rapidly growing population = more infants, less elderly. Age class intervals: age class intervals: arbitrary units of time chose to give a reasonable number of age classes for organisms; more realistic. Insects weeks: microbes minutes to hours, mammals & birds years, humans 5 year intervals. Life tables: data that summarizes life events that are statistically expected for average individual of a specified age in population, age of death, age & timing of reproduction treated as constants. Populations usually only limited by # females therefore the data only considers females. Survivorship schedules lx = (survivorship) probability of being alive at age x. I0 = 1 (cid:894)pro(cid:271)a(cid:271)ilit(cid:455) of (cid:271)ei(cid:374)g ali(cid:448)e (cid:449)he(cid:374) (cid:455)ou"re (cid:271)or(cid:374)(cid:895)
