The mechanism is as follows: It has been found that some male mollies Poecilia have developed deceptive social cues to combat sperm competition. Males who have successfully courted a potential mate will attempt to keep them out of sight of other males before copulation.
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National Academy of Sciences. Some females also benefit from polygyny because extra pair copulations in females increase the genetic diversity with the community of that species. Views Read Edit View history. Molecular and Developmental Evolution.
Sperm competition in birds.
Another cost of mate-guarding in this type of mating system is the potential increase of the spread of disease. The "good sperm hypothesis" is very common in polyandrous mating systems. In this type of mating system, the male is able to mate with more than one female in a community. By engaging in prolonged copulations a male has an increased opportunity to place more sperm within the female's reproductive tract and prevent the female from copulating with other males.