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Postmating sexual selection and the enigmatic jawed genitalia of Callosobruchus subinnotatus
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology. Leiden Univ, Naturalis Biodivers Ctr, Vondellaan 55, NL-2332 AA Leiden, Netherlands..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Leiden Univ, Naturalis Biodivers Ctr, Vondellaan 55, NL-2332 AA Leiden, Netherlands..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.ORCID iD: 0000-0002-3501-3376
2017 (English)In: BIOLOGY OPEN, ISSN 2046-6390, Vol. 6, no 7, p. 1008-1012Article in journal (Refereed) Published
Abstract [en]

Insect genitalia exhibit rapid divergent evolution. Truly extraordinary structures have evolved in some groups, presumably as a result of postmating sexual selection. To increase our understanding of this phenomenon, we studied the function of one such structure. The male genitalia of Callosobruchus subinnotatus (Coleoptera: Bruchinae) contain a pair of jaw-like structures with unknown function. Here, we used phenotypic engineering to ablate the teeth on these jaws. We then experimentally assessed the effects of ablation of the genital jaws on mating duration, ejaculate weight, male fertilization success and female fecundity, using a double-mating experimental design. We predicted that copulatory wounding in females should be positively related to male fertilization success; however, we found no significant correlation between genital tract scarring in females and male fertilization success. Male fertilization success was, however, positively related to the amount of ejaculate transferred by males and negatively related to female ejaculate dumping. Ablation of male genital jaws did not affect male relative fertilization success but resulted in a reduction in female egg production. Our results suggest that postmating sexual selection in males indeed favors these genital jaws, not primarily through an elevated relative success in sperm competition but by increasing female egg production.

Place, publisher, year, edition, pages
COMPANY OF BIOLOGISTS LTD , 2017. Vol. 6, no 7, p. 1008-1012
Keywords [en]
Sexual selection, Callosobruchus, Sperm competition, Sexual conflict, Genitalia
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-331236DOI: 10.1242/bio.025684ISI: 000405569500009PubMedID: 28583926OAI: oai:DiVA.org:uu-331236DiVA, id: diva2:1149408
Funder
EU, European Research Council, GENCON AdG294333Swedish Research Council, 6212014-4523Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2017-10-16Bibliographically approved

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