Female genital mutilation and monandry in an orb-web spider

Biology Letters
Kensuke Nakata

Abstract

Monandry, in which a female has only one mating partner during the reproductive period, is established when a female spontaneously refrains from re-mating, or when a partner male interferes with the attempts of a female to mate again. In the latter case, however, females often have countermeasures against males, which may explain why polyandry is ubiquitous. Here, I demonstrate that the genital appendage, or scape, of the female orb-web spider (Cyclosa argenteoalba) is injured after her first mating, possibly by her first male partner. This female genital mutilation (FGM) permanently precludes copulation, and females appear to have no countermeasures. FGM is considered to confer a strong advantage to males in sexual conflicts over the number of female matings, and it may widely occur in spiders.

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Citations

May 29, 2018·Journal of Evolutionary Biology·Jonathan M Henshaw
Jan 2, 2018·Royal Society Open Science·Pierick MouginotLutz Fromhage
Sep 19, 2020·Evolution; International Journal of Organic Evolution·Kazuyoshi MinekawaTakashi Matsuo
Oct 20, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Cristina TuniMarie E Herberstein
Sep 27, 2020·The Journal of Experimental Biology·Pierick MouginotMichaël Beaulieu

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