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Kikikose Lucas Marie Orleach

Date(s)

le 10 novembre 2022

12h45
Lieu(x)
Ce kikikose aura lieu dans la salle de séminaire de l'IRBI et sur Teams

"The effects of sexual reproduction on evolution: sexual selection, sexual isolation and self-fertilisation."

Cette semaine, nous accueillons Lucas Marie Orleach (postdoc, ECOBIO, Univ Rennes1). Il nous présentera ses travaux sur "The effects of sexual reproduction on evolution: sexual selection, sexual isolation and self-fertilisation.".

Sexual reproduction plays critical roles in evolution – it can for instance generate intense periods of selection, constitute isolating barriers between diverging populations, and can take very different forms within life. During this talk, I will summarise my research along three topics on sexual reproduction.

First, in many species, sexual selection may occur before, during, and after copulation. In a series of experiments using the flatworm Macrostomum lignano, I studied sperm competition in vivo, and quantified the strength of selection along pre- and postcopulatory episodes of selection.

Second, sexual isolation between closely related species is usually though to be innate. By using several populations and species on the Drosophila genus, I studied if and how the social environment experienced by males can influence pre- and postcopulatory components of sexual isolation.

Third, many plant and animal species can self-fertilise, which has cascading effects onto populations genetics and macroevolution. I built simulation models predicting how reproductive isolation builds in selfing compared to outcrossing lineages, which I tested using crossing experiments involving multiple plant species.