Sexual selection counteracts extinction of small populations of the bulb mites

Evolution; International Journal of Organic Evolution
Magdalena Jarzebowska, Jacek Radwan

Abstract

Genetic drift in small populations can increase frequency of deleterious recessives and consequently lead to inbreeding depression and population extinction. On the other hand, as homozygosity at deleterious recessives increases, they should be purged from populations more effectively by selection. Sexual selection has been postulated to strengthen selection against deleterious mutations, and should thus decrease extinction rate and intensify purging of inbreeding depression. We tested these predictions in the bulb mite Rhizoglyphus robini. We created 100 replicate lines of small populations (five males and five females) and in half of them experimentally removed sexual selection by enforcing monogamy. The lines were propagated for eight generations and then assayed for purging of inbreeding depression. We found that proportion of lines which went extinct was lower with sexual selection than without. We also found evidence for purging of inbreeding depression in the lines with sexual selection, but not in lines without sexual selection. Our results suggest that purging of inbreeding depression was more effective against mutations with relatively large deleterious effects. Thus, although our data clearly indicate a positive impa...Continue Reading

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Citations

Sep 15, 2012·Proceedings. Biological Sciences·Agata Plesnar-BielakJacek Radwan
Jan 23, 2013·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Luke Holman, Hanna Kokko
Jan 2, 2015·Evolutionary Applications·Rémi ChargéMatthew Low
Dec 1, 2017·Proceedings. Biological Sciences·Robert J Knell, Carlos Martínez-Ruiz
Jul 30, 2019·Ecology Letters·Jonathan M ParrettRobert J Knell
Jun 20, 2020·Global Change Biology·Joanne L GodwinMatthew J G Gage
Jul 22, 2020·Biological Reviews of the Cambridge Philosophical Society·Roberto García-RoaPau Carazo
Apr 22, 2020·Journal of Evolutionary Biology·Aline Gibson VegaRobert J Dugand
Jun 13, 2018·Proceedings of the National Academy of Sciences of the United States of America·Li YunAneil F Agrawal
Jun 11, 2020·Evolution; International Journal of Organic Evolution·Aleksandra ŁukasiewiczJacek Radwan
Dec 24, 2014·Ecology and Evolution·Eoin DuffyDavid J Hosken

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