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19+LifeHistories - Life Histories start with a puzzle...

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Life Histories: ... start with a puzzle negative relationship between offspring size and number 600 000 000 eggs Mako Shark 2 large, live young Ocean Sunfish Darters ( Etheostoma , Percina ): 15 spp., measure: body size, egg size and number larger females lay more eggs # of eggs Female Size many small eggs vs few large eggs Egg Diameter
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Seed size & number in plants # seeds / plant Average Seed Mass relationship is found between species & between individuals within species trade-off between allocation to different reproductive “functions” (size v. #)
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reproductive allocation strategies: evolve according to “extrinsic” likelihood of survival Age at Maturity Adult survival positive relationship between survival rate & age of reproductive maturity
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Life History Theory trade-offs: - offspring quality & number - present & future reprod. influenced by survival rate Life History Theory: when will selection favor which side of the balance? offspring number vs offspring quality early reproduction vs. late reproduction
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