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  • Laugen, A. T. (author)

Sperm competition in yellow dung flies: No consistent effect of sperm size

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022-08-16
  • Wiley,2022

Numbers

  • LIBRIS-ID:oai:gup.ub.gu.se/318347
  • https://gup.ub.gu.se/publication/318347URI
  • https://doi.org/10.1111/jeb.14073DOI

Supplementary language notes

  • Language:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • The male competition for fertilization that results from female multiple mating promotes the evolution of increased sperm numbers and can impact sperm morphology, with theory predicting that longer sperm can at times be advantageous during sperm competition. If so, males with longer sperm should sire more offspring than competitors with shorter sperm. Few studies have directly tested this prediction, and findings are inconsistent. Here we assessed whether longer sperm provide a competitive advantage in the yellow dung fly (Scathophaga stercoraria; Diptera: Scathophagidae). Initially, we let brothers with different temperature-mediated mean sperm lengths compete - thus minimizing confounding effects of genetic background - and found no clear advantage of longer sperm. We then used flies from lines subjected to bidirectional selection on phenoloxidase activity that had shown correlated evolutionary responses in sperm and female spermathecal duct lengths. This experiment also yielded no main effect of sperm size on siring success. Instead, there was a trend for a shorter-sperm advantage, but only when competing in females with longer spermathecal ducts. Our data corroborated many previously reported findings (last-male precedence, effects of copula duration and body size), suggesting our failure to find sperm size effects is not inherently due to our experimental protocols. We conclude that longer sperm are not competitively superior in yellow dung flies under most circumstances, and that, consistent with previous work, in this species competitive fertilization success is primarily determined by the relative numbers of sperm competing.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Hosken, D. J. (author)
  • Reinhold, K. (author)
  • Schwarzenbach, G. A. (author)
  • Hoeck, P. E. A. (author)
  • Bussiere, Luc,1974Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences(Swepub:gu)xbussl (author)
  • Blanckenhorn, W. U. (author)
  • Lupold, S. (author)
  • Göteborgs universitetInstitutionen för biologi och miljövetenskap (creator_code:org_t)

Related titles

  • In:Journal of Evolutionary Biology: Wiley35:10, s. 1309-13181010-061X1420-9101

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