Behaviour 2019
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Keeping it together: tactile interactions and group coordination in Corydoras catfish
Riva J Riley1,2, Elizabeth Gillie2,3, Andrea Manica3, Neeltje Boogert1,4, James L Savage2, Arne Jungwirth2,5. 1University of Maryland, College Park, MD, United States; 2University of Cambridge, Cambridge, Cambrigeshire, United Kingdom; 3Durham University, Durham, County Durham, United Kingdom; 4University of Exeter, Exeter , Devon, United Kingdom; 5Konrad-Lorenz-Institut für Vergleichende Verhaltensforschung, Vienna, Vienna , Austria

Group coordination is a universal feature of social life, and individuals living in social groups must coordinate their activities. I have described a novel tactile interaction style (termed nudging) in Bronze Cory catfish that individuals use for group coordination. Here I present my first three major studies investigating the role of nudging in group coordination. 1) I investigated the effect of familiarity on nudging and coordination and found that nudging can be used to improve coordination with unfamiliar fish. 2) I investigated how nudging affects group anti-predator flight responses. Nudging led to a higher likelihood of group cohesion and longer group flight times, showing how active interactions can mediate group responses to predators. 3) I investigated the development of nudging, and showed that larvae develop toleration for tactile stimulation with age and require social feedback to develop nudging, supporting the important role of nudging in Bronze Cory catfish sociality. The presence of active interactions in the Bronze Cory catfish modifies its group coordination and has great potential for further questions about social behavior and group functioning.