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Article Dans Une Revue Behavioral Ecology Année : 2020

Does the response of D. melanogaster males to intrasexual competitors influence sexual isolation?

Résumé

The evolutionary consequences of phenotypic plasticity are debated. For example, reproductive barriers between incipient species can depend on the social environment, but most evidence for this comes from studies focusing on the effects of experiencing heterospecific individuals of the opposite sex. In Drosophila melanogaster, males are well known to invest strategically in ejaculate components and show different courtship behavior when reared in the presence of male competitors. It is unknown whether such plasticity in response to same-sex social experience influences sexual isolation, so we tested this using African and cosmopolitan lines, which show partial sexual isolation. Males were housed in social isolation, with homopopulation, or with heteropopulation male partners. We then measured their mating success, latency, and duration, their paternity share, and female remating success. Isolated males copulated for a shorter duration than males housed with any male partners. However, we found no difference in any measure between homopopulation or heteropopulation treatments. Our findings suggest that the male intrasexual competitive social environment does not strongly influence sexual isolation in D. melanogaster, and that plastic effects on reproductive isolation may be influenced more strongly by the experience of social isolation than by the composition of individuals within different social environments. Lay Summary The strength of reproductive isolation between diverging populations may depend on the social interactions experienced by individuals. We used partially isolated populations of fruit flies, Drosophila melanogaster, and showed that whether males had previously interacted with homopopulation or heteropopulation male partners did not affect the strength of premating or postmating sexual isolation. Thus, although male sexual traits are highly labile, this flexibility does not seem to affect the strength of sexual isolation in this system.
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Dates et versions

hal-02885849 , version 1 (16-06-2021)

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Lucas Marie-Orleach, Annui M. Sanz, Nathan W. Bailey, Michael G Ritchie. Does the response of D. melanogaster males to intrasexual competitors influence sexual isolation?. Behavioral Ecology, 2020, 31 (2), pp.487-492. ⟨10.1093/beheco/arz209⟩. ⟨hal-02885849⟩
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