Contemporary sexual selection does not explain variation in male display traits among populations. (1st September 2019)

• Record Type: Journal Article
• Authors: Watts, J. Colton; Flynn, Allissa; Tenhumberg, Brigitte; Hebets, Eileen A.
• Is Part Of: Evolution. Volume 73:Number 9(2019)
• Page Start: 1927
• Page End: 1940
• Publication Date: 2019-09-01
• Subjects: Divergence -- mate choice -- reproductive isolation -- sexual selection -- speciation; Evolution -- Periodicals; Heredity -- Periodicals; Évolution (Biologie) -- Périodiques; Hérédité -- Périodiques; 338.47004094
• DOI: 10.1111/evo.13808
• Languages: English
• ISSNs: 0014-3820

Abstract

Abstract: Sexual selection is widely hypothesized to facilitate the evolution of reproductive isolation through divergence in sexual traits and sexual trait preferences among populations. However, direct evidence of divergent sexual selection causing intraspecific trait divergence remains limited. Using the wolf spider Schizocosa crassipes, we characterized patterns of female mate choice within and among geographic locations and related those patterns to geographic variation in male display traits to test whether divergent sexual selection caused by mate choice explains intraspecific trait variation. We found evidence of phenotypic selection on male behavior arising from female mate choice, but no evidence that selection varied among locations. Only those suites of morphological and behavioral traits that did not influence mate choice varied geographically. These results are inconsistent with ongoing divergent sexual selection underlying the observed intraspecific divergence in male display traits. These findings align with theory on the potentially restrictive conditions under which divergent sexual selection may persist, and suggest that long‐term studies capable of detecting periodic or transient divergent sexual selection will be critical to rigorously assess the relative importance of divergent sexual selection in intraspecific trait divergence.