Personality-dependent passage behaviour of an aquatic invasive species at a barrier to dispersal

Intraspecific variation in personality traits is increasingly recognized as an important determinant of invasion success and associated with the dispersal ability several invasive species. However, previous studies have focused on species through continuous habitats, despite high levels anthropogenic fragmentation modern environments. This study investigated how influences behaviour aquatic at barrier to dispersal, using passage American signal crayfish, Pacifastacus leniusculus , experimental Crump weir a model system. Personality was characterized by determining repeatability boldness, activity sociability, correlations between indicating behavioural syndromes, while quantified motivation subsequent pass weir. Boldness were repeatable positively correlated, boldness–activity syndrome. sociability not therefore classified trait, potentially result confounding effects social hierarchy formation. Bolder individuals tended be more motivated weir, although related activity. Few passed success. evidences presence syndromes crayfish demonstrates that can influence expand their range fragmented habitat. Although no relationship observed, higher bold may lead differential natural situations where time attempt constrained conditions. • Signal assessed. activity, but traits. Crayfish demonstrated successful. Activity behaviour.