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1 July 2008 Sex Ratio Distorter Reduces Sperm Competitive Ability in an Insect
Tom A. R. Price, Amanda J. Bretman, Tomos D. Avent, Rhonda R. Snook, Gregory D. D. Hurst, Nina Wedell
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Abstract

Selfish genetic elements (SGEs) are ubiquitous in animals and often associated with low male fertility due to reduced sperm number in male carriers. In the fruit fly Drosophila pseudoobscura, the meiotic driving X chromosome “sex ratio” kills Y-bearing sperm in carrier males (SR males), resulting in female only broods. We competed SR males against the ejaculates of noncarrying standard males (ST males), and quantified the number of sperm transferred by SR and ST males to females. We show that SR males are very poor sperm competitors, which is partly related to transfer of fewer sperm during mating. However, sperm numbers alone cannot explain the observed paternity reduction, indicating SR males’ sperm may be of reduced quality, possibly due to damage during the killing of the noncarrying Y-sperm. The reduction in sperm competitive ability due to SR is large enough to potentially stabilize the spread of sex ratio drive through populations. The poor sperm competitive ability of SR males coupled with their low fitness as mates could favor increased remating by females to reduce paternity by SR males. Given the generally poor performance of SGE-carrying males in sperm competition, this may generate strong selective pressure favoring polyandry in many species.

Tom A. R. Price, Amanda J. Bretman, Tomos D. Avent, Rhonda R. Snook, Gregory D. D. Hurst, and Nina Wedell "Sex Ratio Distorter Reduces Sperm Competitive Ability in an Insect," Evolution 62(7), 1644-1652, (1 July 2008). https://doi.org/10.1111/j.1558-5646.2008.00386.x
Received: 16 November 2007; Accepted: 9 February 2008; Published: 1 July 2008
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KEYWORDS
Drosophila pseudoobscura
meiotic drive
polyandry
selfish genetic elements
sperm competition
sperm number
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