Les relations jeunes-adultes chez les fourmis : sollicitations alimentaires des larves de l'espèce Ectatomma tuberculatum

Abstract : Parental investment to increase survivability of the young is often optimised by signalling emitted by the young and informing the parents of their level of need. In this thesis, we explored whether the behaviour of ant larvae could be analysed as food solicitations as defined by honest communication models. Indeed, ants are highly social and their social relations differ from the social relation in parent-offspring systems which is usually analysed for food solicitations. We therefore tested, in the ant Ectatomma tuberculatum, whether behaviour of the larvae was correlated with the level of need and if workers provisioned larvae with food according to the intensity of the signal, as predicted by honest signalling models. We showed in this thesis that movements displayed by the larvae as well as a larval volatile emission could influence food provisioning by workers. Larval movements increase with larval developmental stage and volatile emission vary with nutritional state of the larvae. Nurse and forager workers could then optimise food resources allocation inside the nest thanks to signals or cues from the larvae. However, we also show that several other proximal factors are involved. Larval movements are not freely displayed but follow a contact with a worker, and spatial organisation of workers and larvae influences larval movements and food provisioning. Thus we propose alternative or complementary hypotheses to the communication hypothesis.
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Matilde Sauvaget. Les relations jeunes-adultes chez les fourmis : sollicitations alimentaires des larves de l'espèce Ectatomma tuberculatum. Autre. Université Sorbonne Paris Cité, 2017. Français. ⟨NNT : 2017USPCD053⟩. ⟨tel-02272571⟩

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