11-23-11 Life Histories II

11-23-11 Life Histories II - ZOL445 Evolution November 21,...

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ZOL445 Evolution November 21, 2011 Life History Evolution II: Aging Life History Characteristics: Age at first reproduction Mortality rate Rate of reproduction Aging and decline in reproductive success All factors that affect the life table o Shows probability that a person of that age will die before his/her next birthday o Probability of surviving any particular year of age o Remaining life expectancy for people at different ages Age Fraction surviving Age- specific RS Expected RS of individual s x l x m x l x m x 0 1 0 0 1 0.8 0 0 2 0.6 1 0.6 o FITNESS = Σl x m x = Σ(fraction surviving)*(age specific RS) How many offspring should an individual produce in a year? Offspring survival decreases as clutch size increases; optimal clutch size is at the peak to get max # of surviving offspring Optimal survivorship: o Clutch size: 12 o Young per clutch: 0.8 Average clutch size: 9, which lines up with the optimal survivorship
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o Why are the birds obeying Lack’s hypothesis? o
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11-23-11 Life Histories II - ZOL445 Evolution November 21,...

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