BIOL 2400 Lecture Notes - Lecture 11: Mutation, Weaning, Altricial
12 Sep 2017
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Life history traits: a(cid:374) orga(cid:374)is(cid:373)"s life histor(cid:455) is their s(cid:272)hedule of reprodu(cid:272)tio(cid:374) a(cid:374)d sur(cid:448)i(cid:448)al, age distribution of birth and death rates, number and size of offspring. Traits closely linked to fitness: timing of breeding, size of offspring. Litter size offspring size trade-off in mammals: among populations. Latitudinal clutch size cline in house wrens: within populations, polymorphisms in side-blotched lizards. Cole"s parado(cid:454: +1, +1=, population growth rates are equal when: =+1, =+1, +1, +1=+ Trade-offs: organisms would like to have high survival, reproduce early and produce many large offspring. Investment in one aspect of life history trades-off with another: maintenance, growth, reproduction. Survival vs. reproduction (cid:198)reproduction and survival (cid:198)offspring number and size: why do we expect trade-offs, positive correlations between life-history traits are evolutionarily unstable. Individuals with high survival and reproduction should go to fixation. Expect alternative solutions with similar overall fitness at equilibrium.
