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Meiotic drive does not cause condition-dependent reduction of the sexual ornament in stalk-eyed flies

Finnegan, SR; Mondani, M; Fowler, K; Pomiankowski, A; (2021) Meiotic drive does not cause condition-dependent reduction of the sexual ornament in stalk-eyed flies. Journal of Evolutionary Biology 10.1111/jeb.13770. (In press).

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Abstract

Meiotic drive systems are associated with low frequency chromosomal inversions. These are expected to accumulate deleterious mutations due to reduced recombination and low effective population size. We test this prediction using the “sex‐ratio” (SR) meiotic drive system of the Malaysian stalk‐eyed fly Teleopsis dalmanni. SR is associated with a large inversion (or inversions) on the X chromosome. In particular, we study eyespan in males carrying the SR chromosome, as this trait is a highly exaggerated, sexually dimorphic trait, known to have heightened condition‐dependent expression. Larvae were raised in low and high larval food stress environments. SR males showed reduced eyespan under the low and high stress treatments but there was no evidence of a condition‐dependent decrease in eyespan under high stress. Similar but more complex patterns were observed for female eyespan, with evidence of additivity under low stress and heterosis under high stress. These results do not support the hypothesis that reduced sexual ornament size in meiotic drive males is due to a condition‐dependent response to the putative increase in mutation load. Instead, reduced eyespan likely reflects compensatory resource allocation to different traits in response to drive‐mediated destruction of sperm.

Type: Article
Title: Meiotic drive does not cause condition-dependent reduction of the sexual ornament in stalk-eyed flies
Location: Switzerland
DOI: 10.1111/jeb.13770
Publisher version: https://doi.org/10.1111/jeb.13770
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: condition dependence, meiotic drive, sexual ornament, sexual selection, stalk-eyed fly
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: https://discovery.ucl.ac.uk/id/eprint/10121517
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