bb2011 ANP220 12 Mating strategies

bb2011 ANP220 12 Mating strategies - 1 Mating strategies...

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Unformatted text preview: 1 Mating strategies and mating systems ANP 220 meeting #12 Natural selection favors traits that enhance ability to survive and reproduce acts on ALL individuals Charles Darwin Sexual selection category of natural selection favors traits that increase success in competition over mates two forms; each acts on individuals in ONE SEX only Sexual selection intrasexual selection (male-male) mate competition intersexual selection (female) mate choice Goals for today Mating strategies and mating systems whats a strategy? sexual selection & parental investment basis of sexual selection, skew in reproductive rates, maternal investment, female & male reproductive strategies logic of sexual selection & mating systems keys & mechanisms of sexual selection, effects, different mating systems and links to sexual selection 2 Whats a strategy? In behavioral studies ... Strategy (in behavior studies) set of behaviors in a functional context solve problems decision rule non-intentional evolved gene linked flexible (or fixed) ??? Sexual selection theory Its roots in parental investment theory Skew in reproductive potential anisogamy (= unequal gametes) egg = large, immobile = expensive, few sperm = small, mobile = inexpensive, many example splendid fairy wren 1 egg ca. 15-30% females body mass 8 billion sperm in testes at any given time 3 Female mammals maternal investment obligatory conceive & carry fetus internally lactate to nourish infant after birth additional care transportation warmth protection from danger predators, harassment costly care energy, time newborns trouble maintaining body temperature Female mammals maternal investment obligatory conceive & carry fetus internally lactate to nourish infant after birth additional care transportation warmth protection from danger predators, harassment costly care energy, time protection from danger Female mammals maternal investment obligatory conceive & carry fetus internally lactate to nourish infant after birth additional care transportation warmth protection from danger predators, harassment costly care energy, time greater caloric requirements 500 1000 1500 2000 2500 3000 Normal Pregnant Lactating Calorie Requirements +10% +40% Female mammals maternal investment obligatory...
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bb2011 ANP220 12 Mating strategies - 1 Mating strategies...

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