Species prone to monogamy, like gibbons, or in which multiple adult females tend to mate with a single male, like gorillas, tend to have lower sperm-competition rates. Species in which females commonly have multiple male partners, such as chimpanzees and bonobos, tend to have higher rates of sperm competition. If a female chooses to mate with more than one male during her ovulatory cycle, sperm competition, in which the males’ sperm compete to fertilize the female’s ovum, may ensue. A species’ mating system depends in part on female mate choice-how she chooses mates, which ones she chooses, and how many she chooses. WHY SPERM COMPETITION?įemales only require the healthy sperm of one male to put them on the path to reproductive success however, depending on the species’ mating system, females may copulate with more than one male during or around the time they are ovulating (producing mature eggs). This depends not only on a male identifying a mate, engaging in copulatory behavior (sex), and inseminating a female, but also on what happens after copulation and insemination, especially when there is sperm competition. For living animals with internal fertilization (i.e., within the female’s body), reproductive success is determined by many factors, one of which is males’ ability to fertilize females’ ova (eggs). Success in the living world is all about reproduction. The weight of each varies from three-quarters of an ounce to an ounce, and the left is often a little the larger of the two. Are from an inch and a half to two inches long, about an inch and a quarter from the anterior to the posterior border, and nearly an inch from side to side.
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