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Indirect genetic effects and sexual conflicts: partner genotype influences multiple morphological and behavioural reproductive traits in a flatworm

Marie-Orleach, Lucas and Vogt-Burri, Nadja and Mouginot, Pierick and Schlatter, Aline and Vizoso, Dita B. and Bailey, Nathan W. and Schärer, Lukas. (2017) Indirect genetic effects and sexual conflicts: partner genotype influences multiple morphological and behavioural reproductive traits in a flatworm. Evolution, 71 (5). pp. 1232-1245.

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Official URL: http://edoc.unibas.ch/54750/

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Abstract

The expression of an individual's phenotypic traits can be influenced by genes expressed in its social partners. Theoretical models predict that such indirect genetic effects (IGEs) on reproductive traits should play an important role in determining the evolutionary outcome of sexual conflict. However, empirical tests of (i) whether reproductive IGEs exist, (ii) how they vary among genotypes, and (iii) whether they are uniform for different types of reproductive traits are largely lacking. We addressed this in a series of experiments in the simultaneously hermaphroditic flatworm Macrostomum lignano. We found strong evidence for IGEs on both morphological and behavioural reproductive traits. Partner genotype had a significant impact on the testis size of focal individuals—varying up to 2.4-fold—suggesting that IGEs could mediate sexual conflicts that target the male sex function. We also found that time to first copulation was affected by a genotype × genotype interaction between mating partners, and that partner genotype affected the propensity to copulate and perform the postcopulatory suck behaviour, which may mediate conflicts over the fate of received ejaculate components. These findings provide clear empirical evidence for IGEs on multiple behavioural and morphological reproductive traits, which suggests that the evolutionary dynamics of these traits could be altered by genes contained in the social environment.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Zoologie > Evolutionary Biology (Schärer)
UniBasel Contributors:Schärer, Lukas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Wiley
ISSN:0014-3820
e-ISSN:1558-5646
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 Oct 2017 09:34
Deposited On:24 Oct 2017 09:34

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