Behaviour 2019
Collective behaviour and social dynamics during coordinated hunting between octopus and fishes.  
Eduardo Sampaio1,2,3, Vivek Sridhar2,3,4, Fritz Francisco5,6, Máté Nagy2,3,4,7,8, Paul Nührenberg2,3,4, Rui Rosa1, Iain D. Couzin2,3,4, Simon Gingins2,3,4. 1Marine and Environmental Sciences Centre, Faculty of Sciences University of Lisbon, Lisbon, , Portugal; 2Department of Collective Behaviour, Max Planck Institute of Animal Behavior , Konstanz, , Germany; 3Centre for the Advanced Study of Collective Behaviour, Konstanz, , Germany; 4Department of Biology, University of Konstanz, Konstanz, , Germany; 5Technische University, Science of Intelligence (SCIoI), Berlin, , Germany; 6Humbold University, Romanczuk Lab , Berlin, , Germany; 7MTA-ELTE ‘‘Lendület’’ Collective Behaviour Research Group, Hungarian Academy of Sciences, Budapest, , Hungary; 8Department of Biological Physics, Eötvös Loránd University, Budapest, , Hungary

In collective behaviour, complex coordination and individual/group decision-making can emerge from simple, localized rules of interaction, considering every individual as identical. However, in biological systems, variation amongst individuals can alter the “weight” of each specific individual’s decision, creating a dynamic network of attraction-repulsion forces. Parallelly, sociality has the potential to drive brain evolution and complex cognition, but the role of individual cognition in interspecific groups and collective movement constitutes a largely unexplored field. We recorded interspecific hunting events between Octopus cyanea and multiple partners (i.e. various fish species) in the field, reconstructed 3D animals tracks, and performed multi-scale analyses gauging key parameters in interspecific collectives, both at individual decision-making and group movement levels. Understanding these interspecific interactions can deepen our knowledge on the influence of higher order traits (morphological, behavioural, and cognitive) on collective movement and decision-making in naturally-occurring heterogenous groups.