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Étude multi-traits du cannibalisme intra-cohorte chez les premiers stades de vie du sandre (Sander lucioperca)

Abstract : Intra-cohort cannibalism is the act of killing and consuming the whole, or major part, of a conspecific individual of the same age. Most often considered as an artefact of captive conditions, it is now assumed that cannibalism is a natural phenomenon, which could be submitted to selection. In Teleosts, it is mostly found in early life stages. In rearing conditions, several biotic and abiotic factors have been already tested, yet without successfully stop it in several species. In this context, the aim of this thesis is to better understand the onset and the stability of cannibalism, in pikeperch, by focusing on the link between cannibalism, personality and the onset of ichtyophagy. This study comprised three main parts aiming at: (i) describing the cannibalism in early life stages and studying the impact of rearing factors, (ii) determining personality traits in juveniles and describing the onset of ichtyophagy in larvae, (iii) searching the link between cannibalism, personality and onset of ichtyophagy. This thesis showed that rearing factors have no impact on cannibalism. Furthermore, we found behavioural syndromes in early life stages and that the onset of ichtyophagy did not occur at the same time for all individuals. Our results highlight that cannibalism seems to be linked to the onset of ichtyophagy rather than individual personality. In conclusion, cannibalism is not due, throughout the development, to the same individual characteristics than ichtyophagy
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Submitted on : Monday, January 4, 2021 - 4:20:26 PM
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  • HAL Id : tel-01905705, version 1


Tatiana Colchen. Étude multi-traits du cannibalisme intra-cohorte chez les premiers stades de vie du sandre (Sander lucioperca). Biologie animale. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0181⟩. ⟨tel-01905705⟩



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