Berlin 2018 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 76: Complex Contagion Phenomena II (Focus Session, joint SOE/DY/BP/SNPD) (joint session SOE/DY/BP)
DY 76.13: Talk
Friday, March 16, 2018, 13:00–13:15, MA 001
Modeling of startling cascades and information transfer in fish — •Haider Klenz1 and Pawel Romanczuk1,2 — 1Department of Biology, Humboldt-Universität zu Berlin, Berlin 10115, Germany — 2Bernstein Center for Computational Neuroscience, Humboldt-Universität zu Berlin, Berlin 10099, Germany
Animals come together in groups, e.g. school of bird or swarms of fish, in which information is processed collectively. Especially in situation where the collective is exposed to a threat, this information and the speed with which it propagates through the collective is of great importance to the individual.
This work focuses on shoals of Poecilia Sulphuraria and their reaction to danger. Through environmental dependencies the fish can only swim at the surface and therefore forms a 2D-system. When attacked by preying birds the fish dive down. This diving behavior then spreads through the swarm in a wave like fashion and is repeated for several minutes without further triggers.
We explored the mechanism behind wave spreading with agent-based modeling. We propose a stochastic contagion process and show that the speed of the wave depends on the underlying information network. Furthermore we study different possible explanations for repeated waves.