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, 139:871 | Cite as

Genotype × environment interaction is weaker in genitalia than in mating signals and body traits in Enchenopa treehoppers (Hemiptera: Membracidae)

  • Rafael L. RodríguezEmail author
  • Nooria Al-Wathiqui
Article

Abstract

Theory predicts that selection acting across environments should erode genetic variation in reaction norms; i.e., selection should weaken genotype × environment interaction (G × E). In spite of this expectation, G × E is often detected in fitness-related traits. It thus appears that G × E is at least sometimes sustained under selection, a possibility that highlights the need for theory that can account for variation in the presence and strength of G × E. We tested the hypothesis that trait differences in developmental architecture contribute to variation in the expression of G × E. Specifically, we assessed the influence of canalization (robustness to genetic or environmental perturbations) and condition-dependence (association between trait expression and prior resource acquisition or vital cellular processes). We compared G × E across three trait types expected to differ in canalization and condition-dependence: mating signals, body size-related traits, and genitalia. Because genitalia are expected to show the least condition-dependence and the most canalization, they should express weaker G × E than the other trait types. Our study species was a member of the Enchenopa binotata species complex of treehoppers. We found significant G × E in most traits; G × E was strongest in signals and body traits, and weakest in genitalia. These results support the hypothesis that trait differences in developmental architecture (canalization and condition-dependence) contribute to variation in the expression of G × E. We discuss implications for the dynamics of sexual selection on different trait types.

Keywords

Developmental plasticity Maintenance of genetic variation Phytophagous insect 

Notes

Acknowledgments

We thank Bill Eberhard, Kasey D. Fowler-Finn, Gerlinde Höbel, Michael Jennions, Darren Rebar, and three anonymous reviewers for discussion and helpful comments to previous versions of the manuscript. This work was funded by NSF Grant IOS-0919962 to RLR, and by UWM SURF awards to NA-W and RLR.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Behavioral and Molecular Ecology Group, Department of Biological SciencesUniversity of Wisconsin-MilwaukeeMilwaukeeUSA
  2. 2.Biology DepartmentTufts UniversityMedfordUSA

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