in its lifetime eg a coho salmons long trip from ocean to spawning stream then

In its lifetime eg a coho salmons long trip from

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in its lifetime e.g., a coho salmon’s long trip from ocean to spawning stream – then dies Iteroparity : An individual breeds more than once in its lifetime e.g., Atlantic salmon short trip from ocean to spawning stream How Often Should an Individual Reproduce?
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© 2019 Drosophila melanogaster Roff (1981; American Naturalist 118:405) Large female Small female Does Evolution Favour Larger Organisms?
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© 2019 A Tradeoff Between Mating and Lifespan Female Fruit Flies ( Drosophila ) A=normal & mated B=no ovaries (no eggs) C=virgins D=mated, but sterilized Maynard Smith (1958; Journal of Experimental Biology 35:832-842)
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© 2019 A Tradeoff Between Mating and Lifespan -Partridge & Farquhar (1981; Nature 294:580) Male Fruit Flies ( Drosophila ) housed with housed with Inseminated ♀ won't mate with males
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© 2019 Predation affects life history traits Example of an environment affecting life history traits: Trinidadian guppies and predation Guppies Predator – pike cichlids
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© 2019 Predation affects life history traits Example of an environment affecting life history traits: Trinidadian guppies and predation Size at reproduction (mm) Predation Level Low Med. High Low Med. High Reznick, D. & Endler, J.A. (1982) The impact of predation on life history evolution in Trinidadian guppies ( Poecilia reticulata ). Evolution, 36, 160-.
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© 2019 -Kenyon et al. (1993; Nature 366:461) How Long to Live?
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© 2019 In the same environment, introduce nematodes (half wild type, half daf-2 mutants). Follow the frequency of the daf-2 allele over time (generations) -Jenkins et al. (2004; Proceedings of the Royal Society B 271:2523) Why not live forever?
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© 2019 Life History Strategies Form a Continuum Fast (r) Slow (K) Life history traits Offspring size Offspring number Adult size Parity Parental care Offspring survivorship Adult lifespan Sexual maturity Environment
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  • Spring '14
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