Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/31110
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Competition for access to mates predicts female-specific ornamentation and male investment in relative testis size
Author(s): Murray, Rosalind L
Herridge, Elizabeth J
Ness, Rob W
Wiberg, R Axel W
Bussière, Luc F
Contact Email: luc.bussiere@stir.ac.uk
Keywords: operational sex ratio (OSR)
polyandry
female ornaments
dance flies
premating
postmating
sexual selection
Empidinae
Issue Date: Aug-2020
Date Deposited: 7-May-2020
Citation: Murray RL, Herridge EJ, Ness RW, Wiberg RAW & Bussière LF (2020) Competition for access to mates predicts female-specific ornamentation and male investment in relative testis size. Evolution, 74 (18), pp. 1741-1754. https://doi.org/10.1111/evo.13986
Abstract: Sexually selected ornaments are highly variable and the factors that drive variation in ornament expression are not always clear. Rare instances of female‐specific ornament evolution (such as in some dance fly species) are particularly puzzling. While some evidence suggests that such rare instances represent straightforward reversals of sexual selection intensity, the distinct nature of trade‐offs between ornaments and offspring pose special constraints in females. To examine whether competition for access to mates generally favours heightened ornament expression, we built a phylogeny and conducted a comparative analysis of Empidinae dance fly taxa that display female‐specific ornaments. We show that species with more female‐biased operational sex ratios in lek‐like mating swarms have greater female ornamentation, and in taxa with more ornate females, male relative testis investment is increased. These findings support the hypothesis that ornament diversity in dance flies depends on female receptivity to mates, which is associated with contests for nutritious nuptial gifts provided by males. Moreover, our results suggest that increases in female receptivity lead to higher levels of sperm competition among males. The incidence of both heightened pre‐mating sexual selection on females and post‐mating selection on males contradicts assertions that sex‐roles are straightforwardly reversed in dance flies.
DOI Link: 10.1111/evo.13986
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. This is the peer reviewed version of the following article: Murray, R.L., Herridge, E.J., Ness, R.W., Wiberg, R.A.W. and Bussière, L.F. (2020), Competition for access to mates predicts female-specific ornamentation and male investment in relative testis size. Evolution, 74: 1741-1754, which has been published in final form at https://doi.org/10.1111/evo.13986. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archiving.
Licence URL(s): https://storre.stir.ac.uk/STORREEndUserLicence.pdf

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