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J Evol Biol

Title:		Premating isolation is determined by larval rearing substrates in cactophilic Drosophila mojavensis. VIII. Mating success mediated by epicuticular hydrocarbons within and between isolated populations
Author(s):		Etges WJ; Tripodi AD;
Address:		"Department of Biological Sciences, Program in Ecology and Evolutionary Biology, University of Arkansas, Fayetteville, AR 72701, USA. wetges@uark.edu"
Journal Title:		J Evol Biol
Year:		2008
Volume:		20080818
Issue:		6
Page Number:		1641 - 1652
DOI:		10.1111/j.1420-9101.2008.01601.x
ISSN/ISBN:		1420-9101 (Electronic) 1010-061X (Linking)
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 of D. mojavensis"
Keywords:		"Animals *Cactaceae Drosophila/metabolism/*physiology Female Hydrocarbons/*metabolism Larva/physiology Male Reproduction/*physiology Sex Attractants/metabolism Sexual Behavior, Animal/*physiology;"
Notes:		"MedlineEtges, W J Tripodi, A D eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Switzerland 2008/08/21 J Evol Biol. 2008 Nov; 21(6):1641-52. doi: 10.1111/j.1420-9101.2008.01601.x. Epub 2008 Aug 18"