Research on several social fishes has revealed that shoals constituted by familiar individuals behave remarkably differently compared to shoals formed by unfamiliar individuals. However, whether these behavioural changes may arise also in shoals composed by a mixture of familiar and unfamiliar individuals, a situation that may commonly occur in nature, is not clear. Here, we observed the behaviour of Mediterranean killifish (...

Aim Migratory animals regularly move between often distant breeding and non‐breeding ranges. Knowledge about how these ranges are linked by movements of individuals from different populations is crucial for unravelling temporal variability in population spatial structuring and for identifying environmental drivers of population dynamics acting at different spatio‐temporal scales. We performed a large‐scale individual‐based mig...

Invasive alien predators (IAP) are spreading on a global scale—often with devastating ecological effects. One reason for their success may be that prey species fail to recognize them due to a lack of co‐evolutionary history. We performed a comprehensive test of this “prey naiveté” hypothesis using a novel approach: we tested whether predator‐naive tadpoles of the agile frog ( Rana dalmatina ) display antipredator behavior upon...