Proximate mechanisms of the differences in reproductive success of males bearing different alleles of Pgdh - a gene involved in a sexual conflict in bulb mite

Journal of Evolutionary Biology
Anna M Skwierzyńska, Agata Plesnar-Bielak

Abstract

Enzyme polymorphism in phosphogluconate dehydrogenase (Pgdh) is a striking example of single gene polymorphism involved in sexual conflict in bulb mite Rhizoglyphus robini. Males homozygous for the S Pgdh allele were shown to achieve higher reproductive success than FF homozygous males, while negatively influencing fecundity of their female partners. Here, we investigate proximate mechanisms responsible for the increased reproductive success of SS males and find that the S allele is associated with shorter time until copulation, higher copulation frequency and increased sperm production. We also show that Pgdh alleles are probably codominant, with SS males gaining the highest reproductive success, FF males - the lowest - and FS-heterozygous males taking an intermediate position in all fitness parameters differentiating males of different genotypes. Additionally, we confirm the negative effect that S-bearing males impose on the fecundity of females they mate with, showing a clear pattern of interlocus sexual conflict. We discuss that this effect is probably associated with increased copulation frequency. Whereas, contrary to what we have predicted, the S allele does not cause increased general male mobility, we speculate that th...Continue Reading

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Citations

Jul 13, 2020·Journal of Evolutionary Biology·Agata Plesnar-BielakJacek Radwan
May 8, 2021·Biological Reviews of the Cambridge Philosophical Society·Agata Plesnar-Bielak, Aleksandra Łukasiewicz
Dec 23, 2021·Proceedings. Biological Sciences·Thomas J Hitchcock, Andy Gardner

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