Psc101 Owings Lecture 2

Psc101 Owings Lecture 2 - Mating systems Comparative...

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1 Mating systems Comparative approach - across species look at what characteristics are associated with monogamy and polygyny Then look to see where we fit in we will look at sex differences in body size maturation rate reproductive variance Body size Degree of polygyny correlates positively (r+) with male size relative to female size If humans come out of polygynous ancestry and retain some of this tendency you would expect males to be bigger than females, on average Males are moderately taller and heavier than females At 18 M about 5’10” 152lbs. F about 5’5” 124 lbs. Age of Maturity Age at which you reach sexual maturity In general Monogamy: Males = Females Polygyny: Males slower than females Humans? males more slowly (about 2 years later)
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2 Reproductive variance Average reproductive success of males and females has to be the same “it takes two to tango” Variance can be different, its the measure of the spread of the data around the mean Monogamy: Males = Females Polygyny: Males > Females Humans? Males > Females
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3 Reproductive variance Average reproductive success of males and females has to be the same “it take two to tango” Variance can be different, its the measure of the spread of the data around the mean Monogamy: Males = Females Polygyny: Males > Females Humans? Males > Females Intraspecies variation in mating systems Surreptitious (sneaky) matings- bluegill sunfish Forced matings- sea lions
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4 Intraspecies variation in mating systems Variation is out there people used to treat this scatter as error
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Psc101 Owings Lecture 2 - Mating systems Comparative...

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