natural selection The environment affects life history traits by influencing

Natural selection the environment affects life

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natural selection The environment affects life history traits by influencing energy budgets: Maximizing reproductive success involves trade- offs due to
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© 2019 Trade-offs arise from limits in energy budgets If 2 life-history traits compete for a share of limited resources, then it's impossible to maximize both traits simultaneously – any gains by one trait will result in a loss by the other Fitness Seed # Seed size Seed size Seed #
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© 2019 Growth Indeterminate Growth Determinate Growth
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© 2019 Reproduction Asexual reproduction produces clones Sexual reproduction produces recombinants
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© 2019 Life History Traits Life history traits are hugely variable Growth rate Parental investment Number of offspring (fecundity) Frequency of reproduction Age of maturity Size at maturity Size of offspring Longevity/life expectancy (mortality rate)
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© 2019 A Tradeoff Between Reproduction and Growth -Warner (1984; Evolution 38:148)
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© 2019 Beamish, R.J. 1973. J. Fish. Res. Board Can. 30:607-616 Growth & reproduction in white suckers Indeterminate growth Growth slows at maturity 3-5 y
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© 2019 How Much Parental Investment Should a Parent Provide Each Offspring? How Many Offspring Should Be Produced? Orchid Coco-de-mer Elephant Mouse
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© 2019 A Tradeoff Between Parental Care and Survival of Offspring European Magpie ( Pica pica ) -Hogstedt (1980; Science 4474:1148) normal 0
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© 2019 Ghalambor & Martin. 2001. Science 292:494- 497 A Tradeoff Between Reproduction and Survival of Parent N = 118 species
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© 2019 A Tradeoff Between Reproduction and Survival of Parent -Clutton-Brock et al. (1982; Red deer: Behavior & ecology of two sexes; pg. 77) =female = with fawns = no fawns Mortality rates of female red deer ( Cervus elaphus )
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© 2019 Semelparity An individual breeds only once
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  • Spring '14
  • Production , Reid, Topic 11

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