Polyandry sexual aspects

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Sex differences in reproductive investment play a crucial role in sexual conflict. One intriguing aspect of sexual conflict is the evolution of female multiple mating polyandryparticularly in systems where females receive no obvious direct benefits from males, and where mating is highly costly. Here, theory predicts that polyandrous females can increase their reproductive success by taking advantage of the genetic benefits of mating with multiple males.

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Polygynythe marriage of a man and two or more women at the same time, includes an analogous sororal form. Polyandrous cultures have devised several methods through which to designate the ancestry of the children of such marriages. In fraternal polyandry, the children are often said to be descended from the eldest brother alone, while in other cases fatherhood is established through a ceremony or the children are said to have descended from all the husbands equally.

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Please take this quick survey to tell us about what happens after you publish a paper. Behavioral Ecology and Sociobiology. Spotted sandpipers have a resource defense polyandrous mating system in which females compete for control of breeding territories and mates, and males provide most of the parental care.

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Polyandry is contrasted with polygynyinvolving one male and two or more females. If a marriage involves a plural number of "husbands and wives" participants of each gender, then it can be called polygamy, [1] group or conjoint marriage. Of the 1, societies listed in the Ethnographic Atlas, were found to be monogamous; had occasional polygyny; had more frequent polygyny; and 4 had polyandry.

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Skip to search form Skip to main content. The Darwin-Bateman paradigm recognizes competition among males for access to multiple mates as the main driver of sexual selection. Increasingly, however, females are also being found to benefit from multiple mating so that polyandry can generate competition among females for access to multiple males, and impose sexual selection on female traits that influence their mating success.

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Abstract - Honey bees in the genus Apis share many reproductive features with other social insects, but have also a number of highly derived mating characteristics, such as obligatory polyandry and - in at least two species - males who deposit their ejaculates directly into the spermathecal duct. These characteristics make the honeybees highly interesting and a special model system for studying sexual selection. Furthermore, the numerical sex ratio of Apis bees is extremely male biased and males die during their first and only copulation.

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Author contributions: J. In principle, widespread polyandry female promiscuity creates potential for sexual selection in males both before and after copulation. However, the way polyandry affects pre- and postcopulatory episodes of sexual selection remains little understood. Resolving this fundamental question has been difficult because it requires extensive information on mating behavior as well as paternity for the whole male population.

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For generations, anthropologists have told their students a fairly simple story about polyandry—the socially recognized mating of one woman to two or more males. The story has gone like this:. While we can find a cluster of roughly two dozen societies on the Tibetan plateau in which polyandry exists as a recognized form of mating, those societies count as anomalous within humankind.

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This page has been archived and is no longer updated. A mating system describes how males and females pair when choosing a mate. Males and females differ greatly in the investment each makes to reproduce, and may therefore approach mating with differing strategies.

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