Sperm duct plugs
This paper describes the first three cases in which male crickets monopolize females by means of mating plugs. The origin of the plugs vary among the cases i. Female monogamy is assured by the permanent presence of the plug attached to their genitalia after first mating, while males are potentially polygamous. The presence of an additional clasping structure and the occurrence of forced copulation are also described.
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CA1198643A - Device and method for reversibly occluding a body duct - Google Patents
Mating Plugs in Polyandrous Giants: Which Sex Produces Them, When, How and Why?
Try out PMC Labs and tell us what you think. Learn More. Mating plugs are hardened structures—typically a coagulation of seminal fluid components—that are transferred to, or formed within, the female reproductive tract of numerous animal species both mammals and insects. Analysis of the role s of the mating plug in reproduction has been conducted in a wide array of diverse species. These structures have been proposed to have a multitude of functions, which include altering female re-mating rate, acting as a barrier to re-mating and being required for sperm storage or sperm movement to occur in mated females. A recent analysis of the Drosophila melanogaster mating plug has shown that proper formation of the structure is required for optimal fertility in flies: the Drosophila mating plug is required to retain the ejaculate within the female reproductive tract once mating has terminated.
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Males usually produce mating plugs to reduce sperm competition. However, females can conceivably also produce mating plugs in order to prevent unwanted, superfluous and energetically costly matings. In the giant wood spider Nephila pilipes , a highly sexually dimorphic and polygamous species, males are known to produce ineffective embolic plugs through genital damage, but nothing is known about the origin and function of additional conspicuous amorphous plugs AP covering female genitals. We tested alternative hypotheses of the nature and function of AP in N. No APs were ever formed during mating trials, which rules out the possibility of male AP formation.
The device comprises two spaced flexible plugs 12, 14 connected to each other by a flexible connecting member, 16 such as a suture or other filament. The plugs are of size so as to be snugly received by the lumen 44 of the body duct at implantation without exerting excessive pressure therein. The device is preferably implanted in the duct by insertion of each plug through a respective puncture hole 46 in the wall 42 of the duct, with a portion of the connecting member being retained externally of the duct to prevent migration of the plugs.
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