There are direct and indirect benefits of being the selective individual. In the majority of systems where mate choice exists, one sex tends to be competitive with their same-sex members and the other sex is choosy (meaning they are selective when it comes to picking individuals to mate with). These are direct phenotypic benefits, sensory bias, the Fisherian runaway hypothesis, indicator traits and genetic compatibility. At present, there are five sub mechanisms that explain how mate choice has evolved over time. Ideas on sexual selection were first introduced in 1871, by Charles Darwin, then expanded on by Ronald Fisher in 1915. Mate choice is a major component of sexual selection, another being intrasexual selection. Further investigation of this concept, has found that it is in fact the specific trait of blue and green colour near the eyespot that seems to increase the females likelihood of mating with a specific peacock. For example, if female peacocks desire mates who have a colourful plumage, then this trait will increase in frequency over time as male peacocks with a colourful plumage will have more reproductive success. These mechanisms are a part of evolutionary change because they operate in a way that causes the qualities that are desired in a mate to be more frequently passed on to each generation over time. The evaluation will then incur a response of some sort.
In other words, before an animal engages with a potential mate, they first evaluate various aspects of that mate which are indicative of quality-such as the resources or phenotypes they have-and evaluate whether or not those particular trait(s) are somehow beneficial to them. It is characterized by a "selective response by animals to particular stimuli" which can be observed as behavior. Mate choice is one of the primary mechanisms under which evolution can occur. Here, black grouse males gather in a quagmire and the females then arrive and observe the male before choosing one.
Mate choice is highly visible in lek mating.
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