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Behavioral Ecolog1 - Behavioral Ecology Mating Systems In...

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Behavioral Ecology Mating Systems In 1871, Charles Darwin added sexual selection to his mechanisms of evolution. Intrasexual selection and intersexual selection can result in differential reproduction, and, hence, evolution. In general, females are choosy when it comes to selecting a mate, while males are desperate. This is due to the differential investment made by males and females. Females put great effort into their young while males often play no part in rearing their offspring and simply try to impregnate as many females as possible. A female therefore puts more energy into passing on her genes, and so must be more careful that her young will be fit. In situations when males do put effort into raising offspring, monogamy often results. One of the major factors that determine the type of mating system a population will have is the operational sex ratio (OSR), the ratio of sexually available females to sexually available males.
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