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Family conflicts in Bombus hypnorum L. (Hymenoptera: Apidae) societies: behavioural and genetic studies.

par Torres Marinho Bezerril Fontenelle, Matheus
Président du jury Roisin, Yves
Promoteur Aron, Serge
Publication Non publié, 2023-09-06

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Résumé :

Eusocial Hymenoptera are a battleground of family conflicts. This is largely due to their haplodiploidreproductive system, whereby males arise from unfertilized-haploid eggs and females fromfertilized-diploid eggs, which is source of relatedness asymmetries that drive contrasting interestsbetween nestmates. Lifetime monogamy was crucial to the evolution of eusociality. Yet, derivedreproductive systems such as polygyny (multiple queens per colony) and polyandry (multiple matingby queens) evolved repeatedly in a large number of species. Such variations in the reproductivestrategies deeply modify colony genetic architecture and provide unique opportunities to improveour understanding on how eusocial insects are a paramount of cooperation and conflicts.In this study, I investigated the level of aggressiveness between nestmate workers in thefacultatively polyandrous bumblebee Bombus hypnorum. First, I analysed the level of agonisticworker-worker interactions among nestmates. Second, I have explored whether aggressivebehaviours between workers translate differences in paternal lineages. Our data show (1) thataggressive behaviours are rare among nestmate workers, and (2) there is a poor associationbetween workers’ genetic groups and aggressiveness. We propose the use of more powerful genetictools and a greater sampling to further understand family conflicts.