Premating isolation is determined by larval rearing substrates in cactophilic Drosophila mojavensis. VIII. Mating success mediated by epicuticular hydrocarbons within and between isolated populations

Journal of Evolutionary Biology
William J Etges, A D Tripodi

Abstract

We tested the hypothesis that intrademic sexual selection has caused sexual isolation between populations of geographically isolated populations of cactophilic Drosophila mojavensis, and was mediated by epicuticular hydrocarbons (EHCs), contact pheromones in this system. Sexual selection and sexual isolation were estimated using a Baja California and mainland population by comparing the number of mated and unmated males and females in each of four pairwise population mating trials. EHC profiles were significantly different in mated and unmated males in the interdemic (Bajafemale symbol x Mainlandmale symbol and Mainlandfemale symbol x Bajamale symbol), but not the intrademic mating trials. A small number of EHCs was identified that best discriminated among mated and unmated males, mostly alkadienes with 34 and 37 carbons. Females showed population-specific preferences for male EHC profiles. However, EHC profiles between mated and unmated males in the intrademic mating trials were not significantly different, consistent with undetectable sexual selection estimated directly from numbers of copulating pairs vs. unmated adults. Thus, sexual isolation among populations was much stronger than sexual selection within these populations...Continue Reading

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Citations

May 15, 2012·Journal of Biosciences·Punita Nanda, Bashisth Narayan Singh
Jun 28, 2011·BMC Evolutionary Biology·Cássia C de OliveiraWilliam J Etges
Nov 29, 2015·Molecular Ecology·William J EtgesAllen G Gibbs
Jul 14, 2010·Evolution; International Journal of Organic Evolution·Laura Sullivan-Beckers, Reginald B Cocroft
Apr 13, 2011·Journal of Evolutionary Biology·J A HavensW J Etges
Jan 27, 2010·Evolution; International Journal of Organic Evolution·Stephen F ChenowethMark W Blows
Sep 12, 2009·Evolution; International Journal of Organic Evolution·Jackson H Jennings, William J Etges
Jun 17, 2015·Progress in Lipid Research·Joanne Y Yew, Henry Chung

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