6533b86efe1ef96bd12cc0a3
RESEARCH PRODUCT
Post-copulatory sexual selection allows females to alleviate the fitness costs incurred when mating with senescing males.
Michel Saint JalmeLoïc LesobrePauline VuarinGabriele SorciFrédéric LacroixYves HingratAlice BouchardToni ChalahGwènaëlle Levêquesubject
0106 biological sciencesMaleOffspringEvolutionpaternal ageBiology010603 evolutionary biology01 natural sciencesGeneral Biochemistry Genetics and Molecular BiologyBirds03 medical and health sciencesReproductive senescenceSexual Behavior Animalreproductive senescenceAnimalsMatingSperm competitionLife History Traits030304 developmental biologyGeneral Environmental Science0303 health sciencesGeneral Immunology and MicrobiologyReproductive successoffspring survivalReproductionGeneral MedicineSpermSpermatozoaFemale sperm storageSexual selectionFertilizationFemalesperm selection[SDE.BE]Environmental Sciences/Biodiversity and EcologyGeneral Agricultural and Biological Sciencessiring successDemography[SDV.EE.IEO]Life Sciences [q-bio]/Ecology environment/Symbiosisdescription
8 pages; International audience; Male senescence has detrimental effects on reproductive success and offspring fitness. When females mate with multiple males during the same reproductive bout, post-copulatory sexual selection that operates either through sperm competition or cryptic female choice might allow females to skew fertilization success towards young males and as such limit the fitness costs incurred when eggs are fertilized by senescing males. Here, we experimentally tested this hypothesis. We artificially inseminated female North African houbara bustards with sperm from dyads of males of different (young and old) or similar ages (either young or old). Then, we assessed whether siring success was biased towards young males and we measured several life-history traits of the progeny to evaluate the fitness costs due to advanced paternal age. In agreement with the prediction, we found that siring success was biased towards young males, and offspring sired by old males had impaired hatching success, growth and post-release survival (in females). Overall, our results support the hypothesis that post-copulatory sexual selection might represent an effective mechanism allowing females to avoid the fitness costs of fertilization by senescing partners.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-10-23 |