Sexual dimorphism in epicuticular compounds despite similar sexual selection in sex role-reversed seed beetles

I. Booksmythe, H. D. Rundle, G. Arnqvist

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Sexual selection imposed by mating preferences is often implicated in the evolution of both sexual dimorphism and divergence between species in signalling traits. Epicuticular compounds (ECs) are important signalling traits in insects and show extensive variability among and within taxa. Here, we investigate whether variation in the multivariate EC profiles of two sex role-reversed beetle species, Megabruchidius dorsalis and Megabruchidius tonkineus, predicts mate attractiveness and mating success in males and females. The two species had highly distinct EC profiles and both showed significant sexual dimorphism in ECs. Age and mating status in both species were also distinguishable by EC profile. Males and females of both species showed significant association between their EC profile and attractiveness, measured both as latency to mating and as success in mate-choice trials. Remarkably, the major multivariate vector describing attractiveness was correlated in both species, both sexes, and in both choice and no-choice experiments such that increased attractiveness was in all cases associated with a similar multivariate modification of EC composition. Furthermore, in both sexes this vector of attractiveness was associated with more male-like EC profiles, as well as those characterizing younger and nonvirgin individuals, which might reflect a general preference for individuals of high condition in both sexes. Despite significant sexual selection on EC composition, however, we found no support for the proposition that sexual selection is responsible for divergence in ECs between these species.

Original languageEnglish
Pages (from-to)2005-2016
Number of pages12
JournalJournal of Evolutionary Biology
Volume30
Issue number11
DOIs
Publication statusPublished - 1 Nov 2017
Externally publishedYes

Keywords

  • chemical signalling
  • cuticular hydrocarbon
  • mate attractiveness
  • mutual mate choice
  • sexual dimorphism
  • speciation
  • species dimorphism

Cite this

@article{61180c66407f4bf698c3639978bc2b2f,
title = "Sexual dimorphism in epicuticular compounds despite similar sexual selection in sex role-reversed seed beetles",
abstract = "Sexual selection imposed by mating preferences is often implicated in the evolution of both sexual dimorphism and divergence between species in signalling traits. Epicuticular compounds (ECs) are important signalling traits in insects and show extensive variability among and within taxa. Here, we investigate whether variation in the multivariate EC profiles of two sex role-reversed beetle species, Megabruchidius dorsalis and Megabruchidius tonkineus, predicts mate attractiveness and mating success in males and females. The two species had highly distinct EC profiles and both showed significant sexual dimorphism in ECs. Age and mating status in both species were also distinguishable by EC profile. Males and females of both species showed significant association between their EC profile and attractiveness, measured both as latency to mating and as success in mate-choice trials. Remarkably, the major multivariate vector describing attractiveness was correlated in both species, both sexes, and in both choice and no-choice experiments such that increased attractiveness was in all cases associated with a similar multivariate modification of EC composition. Furthermore, in both sexes this vector of attractiveness was associated with more male-like EC profiles, as well as those characterizing younger and nonvirgin individuals, which might reflect a general preference for individuals of high condition in both sexes. Despite significant sexual selection on EC composition, however, we found no support for the proposition that sexual selection is responsible for divergence in ECs between these species.",
keywords = "chemical signalling, cuticular hydrocarbon, mate attractiveness, mutual mate choice, sexual dimorphism, speciation, species dimorphism",
author = "I. Booksmythe and Rundle, {H. D.} and G. Arnqvist",
year = "2017",
month = "11",
day = "1",
doi = "10.1111/jeb.13171",
language = "English",
volume = "30",
pages = "2005--2016",
journal = "Journal of Evolutionary Biology",
issn = "1010-061X",
publisher = "Wiley-Blackwell",
number = "11",

}

Sexual dimorphism in epicuticular compounds despite similar sexual selection in sex role-reversed seed beetles. / Booksmythe, I.; Rundle, H. D.; Arnqvist, G.

In: Journal of Evolutionary Biology, Vol. 30, No. 11, 01.11.2017, p. 2005-2016.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Sexual dimorphism in epicuticular compounds despite similar sexual selection in sex role-reversed seed beetles

AU - Booksmythe, I.

AU - Rundle, H. D.

AU - Arnqvist, G.

PY - 2017/11/1

Y1 - 2017/11/1

N2 - Sexual selection imposed by mating preferences is often implicated in the evolution of both sexual dimorphism and divergence between species in signalling traits. Epicuticular compounds (ECs) are important signalling traits in insects and show extensive variability among and within taxa. Here, we investigate whether variation in the multivariate EC profiles of two sex role-reversed beetle species, Megabruchidius dorsalis and Megabruchidius tonkineus, predicts mate attractiveness and mating success in males and females. The two species had highly distinct EC profiles and both showed significant sexual dimorphism in ECs. Age and mating status in both species were also distinguishable by EC profile. Males and females of both species showed significant association between their EC profile and attractiveness, measured both as latency to mating and as success in mate-choice trials. Remarkably, the major multivariate vector describing attractiveness was correlated in both species, both sexes, and in both choice and no-choice experiments such that increased attractiveness was in all cases associated with a similar multivariate modification of EC composition. Furthermore, in both sexes this vector of attractiveness was associated with more male-like EC profiles, as well as those characterizing younger and nonvirgin individuals, which might reflect a general preference for individuals of high condition in both sexes. Despite significant sexual selection on EC composition, however, we found no support for the proposition that sexual selection is responsible for divergence in ECs between these species.

AB - Sexual selection imposed by mating preferences is often implicated in the evolution of both sexual dimorphism and divergence between species in signalling traits. Epicuticular compounds (ECs) are important signalling traits in insects and show extensive variability among and within taxa. Here, we investigate whether variation in the multivariate EC profiles of two sex role-reversed beetle species, Megabruchidius dorsalis and Megabruchidius tonkineus, predicts mate attractiveness and mating success in males and females. The two species had highly distinct EC profiles and both showed significant sexual dimorphism in ECs. Age and mating status in both species were also distinguishable by EC profile. Males and females of both species showed significant association between their EC profile and attractiveness, measured both as latency to mating and as success in mate-choice trials. Remarkably, the major multivariate vector describing attractiveness was correlated in both species, both sexes, and in both choice and no-choice experiments such that increased attractiveness was in all cases associated with a similar multivariate modification of EC composition. Furthermore, in both sexes this vector of attractiveness was associated with more male-like EC profiles, as well as those characterizing younger and nonvirgin individuals, which might reflect a general preference for individuals of high condition in both sexes. Despite significant sexual selection on EC composition, however, we found no support for the proposition that sexual selection is responsible for divergence in ECs between these species.

KW - chemical signalling

KW - cuticular hydrocarbon

KW - mate attractiveness

KW - mutual mate choice

KW - sexual dimorphism

KW - speciation

KW - species dimorphism

UR - http://www.scopus.com/inward/record.url?scp=85032912952&partnerID=8YFLogxK

U2 - 10.1111/jeb.13171

DO - 10.1111/jeb.13171

M3 - Article

VL - 30

SP - 2005

EP - 2016

JO - Journal of Evolutionary Biology

JF - Journal of Evolutionary Biology

SN - 1010-061X

IS - 11

ER -