Social information use for spatial decision in the common lizard, Zootoca vivipara - Archive ouverte HAL
Article Dans Une Revue Animal Behaviour Année : 2024

Social information use for spatial decision in the common lizard, Zootoca vivipara

Mathieu Brevet
Staffan Jacob
  • Fonction : Auteur
Alexis Rutschmann
  • Fonction : Auteur
Murielle Richard
  • Fonction : Auteur
Jean Clobert
  • Fonction : Auteur

Résumé

Individuals' movements are conditioned by the acquisition of information from personal interactions with the environment or social sources. Despite the importance of social information in movement decision-making, little is known about how individuals proceed when social information comes from multiple sources. Here, we specifically tackled this by experimentally testing (i) how social information from multiple sources is used to make relocation decisions, and (ii) whether a contrast in this information enables individuals to orient themselves in space. Using the common lizard (Zootoca vivipara) as a model species, we conducted repeated experiments in which a focal neonate received information from two other neonates coming from peripheral environments, before being given the opportunity to relocate to either peripheral environment. We focused on information on resource availability and intra-specific competition by considering the informants' body mass at birth (BM) and subsequent food intake. Our analyses revealed that the amount of resources in the informants' environment affected relocation decisions, depending on the focal individual's BM: the probability of relocation increased when the informants' food intake and the focal individual's BM decreased or when both increased. It suggests that focal individuals adjusted their relocation response to social information in function of their needs and/or physical abilities. On the other hand, we found no effect of BM differences between informants or spatial variability in resource availability on spatial orientation. This study highlights that multiple sources of social information can be used for movement decisions, probably because these sources of information reflect the quality of the surrounding environment (competition or resource availability).
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hal-04849109 , version 1 (19-12-2024)

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Mathieu Brevet, Staffan Jacob, Alexis Rutschmann, Murielle Richard, Julien Cote, et al.. Social information use for spatial decision in the common lizard, Zootoca vivipara. Animal Behaviour, 2024, 218, pp.95-108. ⟨10.1016/j.anbehav.2024.09.014⟩. ⟨hal-04849109⟩
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