Description du projet
Pourquoi les mâles préfèrent-ils les araignées veuves «tueuses»?
Chez la veuve brune Latrodectus geometricus, le cannibalisme est activement facilité par les mâles qui optent pour une posture copulatoire spécifique. Le fait d’être dévoré par leur partenaire leur apporte des avantages en termes de paternité par rapport à leurs concurrents non dévorés. Cependant, les mâles peuvent également s’accoupler avec des femelles subadultes quelques jours avant leur mue finale. Les accouplements avec ces femelles aboutissent à coup sûr à la reproduction, mais jamais au cannibalisme. Il est intéressant de noter que lorsqu’ils ont le choix, les mâles préfèrent s’accoupler avec des femelles adultes cannibales plutôt qu’avec des femelles subadultes. Le projet Widow Spider Mating, financé par l’UE, testera l’hypothèse selon laquelle l’accouplement avec des femelles subadultes n’est pas exempt de conséquences pour le mâle, ce qui suggère un compromis entre le taux d’accouplement et l’assurance de la reproduction.
Objectif
Female widow spiders are frequently cannibalistic, but males of the invasive brown widow spider Latrodectus geometricus can avoid being eaten by mating with immature females that never attack their mating partners. Although immature females are generally assumed unable to mate due to the lack of developed external genitalia, in this species they readily mate and produce offspring at maturity. Nevertheless, despite the benefits arising from immature mating, males consistently prefer to mate with adult, cannibalistic females. Sexual cannibalism is generally considered detrimental for the male, but in L. geometricus it represents a male adaptive strategy which brings advantages in terms of lower female propensity to re-mate. Therefore, its lack in immature mating may come at cost of paternity loss due to female re-mating. I suggests a trade-off between mating rate and reproductive assurance. In the proposed project, I will test the hypothesis that immature mating is costly for the male. I will investigate the mechanism of immature mating as well as ultimate fitness consequences for the male in terms of paternity. I will use a multidisciplinary approach, combining state-of-the-art behavioural, morphological and molecular methods. Utilizing the expertise and infrastructure in two excellent institutions: University of Greifswald and University of Toronto, I will enhance international collaboration and knowledge transfer among research teams. At the University of Greifswald, mating systems are studied by a combination of behavioural and morphological approaches. Using advanced tools to study and visualize internal structures crucial for understanding reproductive biology, I will characterize the morphological mechanisms and structures associated with immature mating. At the University of Toronto, I will use established husbandry infrastructure and molecular techniques to determine behavioural correlates of paternity, and links to female reproductive output.
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MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinateur
17489 Greifswald
Allemagne