Does social context affect boldness in juveniles?

Current Zoology
Siobhan Loftus, Jost Borcherding

Abstract

Differences in boldness are common between populations or between related species and are discussed as part of individual coping style, personality, or behavioral syndrome. Boldness has been found to be dependent on experience, social, and environmental contexts. The major aim of the present study was to establish an experimental environment that would allow analyzing the risk-taking behavior of 2 competing invasive goby species.Neogobius melanostomuswas more active in the absence of a predatorSander luciopercathanN. fluviatilisand clearly spent more time "swimming" and "feeding" thanN. fluviatilis. In addition,N. melanostomuswas always faster thanN. fluviatilisboth when leaving the shelter and reaching offered food. Based on the different behaviors recorded, species-specific boldness scores were established using a principal component analysis. Although there was no overall difference in boldness scores between the 2 species, both competitive conditions and the effect of the predator played significant roles as factors influencing boldness.Neogobius melanostomuswas more affected by the presence/absence of the predator than the social circumstances.Neogobius fluviatilis, on the other hand, was more active and bolder in competit...Continue Reading

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