Sex-specific patterns of senescence in artificial insect populations varying in sex-ratio to manipulate reproductive effort.

Charly Jehan (1) , Manon Chogne (1) , Thierry Rigaud (1) , Yannick Moret (1)

1 BGS - Biogéosciences [UMR 6282]

The disposable soma theory of ageing assumes that organisms optimally trade-off limited resources between reproduction and longevity to maximize fitness. Early reproduction should especially trade-off against late reproduction and longevity because of reduced investment into somatic protection, including immunity. Moreover, as optimal reproductive strategies of males and females differ, sexually dimorphic patterns of senescence may evolve. In particular, as males gain fitness through mating success, sexual competition should be a major factor accelerating male senescence. In a single experiment, we examined these possibilities by establishing artificial populations of the mealworm beetle, Tenebrio molitor, in which we manipulated the sex-ratio to generate variable levels of investment into reproductive effort and sexual competition in males and females.

Mots clés: Ageing; Cost of reproduction; Disposable soma theory; Immunity; Immuno-senescence; Tenebrio molitor

Domaines: Biodiversité et Ecologie

Charly Jehan, Manon Chogne, Thierry Rigaud, Yannick Moret. Sex-specific patterns of senescence in artificial insect populations varying in sex-ratio to manipulate reproductive effort.. BMC Evolutionary Biology, 2020, 20 (1), pp.18. ⟨10.1186/s12862-020-1586-x⟩. ⟨hal-02542222⟩