Choosing others dating and mate selection

Comparing males in this case is presumably a more challenging cognitive task, as it involves remembering the characteristics of an individual that is no longer in sight. Bakker and Manfred Milinski of the University of Bern in Switzerland found that female three-spined sticklebacks (Gasterosteus aculeatus) will tailor their mate choice to the relative attractiveness of the present and previously encountered males.Studies have shown that females can rank the characteristics of sequentially presented males. Females were more likely to show interest in a male if his red nuptial coloring was brighter than the previous male's and more likely to reject a suitor whose coloring was less bright than his predecessor's.Assuming the trait is heritable, offspring expressing the beneficial trait will, in turn, achieve greater reproductive success than their competitors, and so on, through future generations.Further, Darwin proposed that some of these traits may have evolved because they attract the attention of females.

Ryan of the University of Texas at Austin and Anne C.Charles Darwin was the first to propose that competition for mates plays an important role in reproductive success--a process he dubbed sexual selection.In The Descent of Man, and Selection in Relation to Sex, published in 1871, Darwin hypothesized that any trait that gives a male mating and fertilization advantages will evolve in a population because males with such traits will produce more offspring than their competitors.Whether a female chooses her mate from among a dozen dancing grouse or between a pair of crimson fish, she generally selects the most conspicuous contender.Empirical evidence indicates that females commonly prefer male traits that most strongly stimulate their senses.

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