ANP 325 Evolution of Social Behavior

ANP 325 Evolution of Social Behavior - Evolution of Sexual...

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Lecture Topic: Natural Selection acts upon individual Acts upon only one sex One gamete is more valuable than the other Only 1 egg is viable, sperm is cheap Anisogamy Sexual selection explains other traits Trivers Everything given to offspring including time and lactation and other costs Trade-offs between heavily invest in a single offspring vs. having more offspring, investment in current = lost to future potential Increasing resources of females can increase the survivability of offspring Usually limited to caring for only 1 offspring Parental Investment Ratio of males to sexually receptive females at any given point is not 50/50 Distinct from actual sex ratio # of males is higher than females who can reproduce at a given point Interbirth interval is a limiting factor Males = Intrasexual selection Depending on degree of difference in sexual selection Females = Intersexual selection, choose high quality males Operational Sex Ratio Between males for access to females Maximize access, monopolize and provide as little resources as possible Some species highly seasonal so it is difficult Monopolizability has to do with social structure and timing of
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ANP 325 Evolution of Social Behavior - Evolution of Sexual...

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