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Modeling Warfare in Social Animals: A "Chemical" Approach

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  • Alisa Santarlasci
  • Gianluca Martelloni
  • Filippo Frizzi
  • Giacomo Santini
  • Franco Bagnoli

Abstract

We present here a general method for modelling the dynamics of battles among social animals. The proposed method exploits the procedures widely used to model chemical reactions, but still uncommon in behavioural studies. We applied this methodology to the interpretation of experimental observations of battles between two species of ants (Lasius neglectus and Lasius paralienus), but this scheme may have a wider applicability and can be extended to other species as well. We performed two types of experiment labelled as interaction and mortality. The interaction experiments are designed to obtain information on the combat dynamics and lasted one hour. The mortality ones provide information on the casualty rates of the two species and lasted five hours. We modelled the interactions among ants using a chemical model which considers the single ant individuals and fighting groups analogously to atoms and molecules. The mean-field behaviour of the model is described by a set of non-linear differential equations. We also performed stochastic simulations of the corresponding agent-based model by means of the Gillespie event-driven integration scheme. By fitting the stochastic trajectories with the deterministic model, we obtained the probability distribution of the reaction parameters. The main result that we obtained is a dominance phase diagram, that gives the average trajectory of a generic battle, for an arbitrary number of opponents. This phase diagram was validated with some extra experiments. With respect to other war models (e.g., Lanchester's ones), our chemical model considers all phases of the battle and not only casualties. This allows a more detailed description of the battle (with a larger number of parameters), allowing the development of more sophisticated models (e.g., spatial ones), with the goal of distinguishing collective effects from the strategic ones.

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  • Alisa Santarlasci & Gianluca Martelloni & Filippo Frizzi & Giacomo Santini & Franco Bagnoli, 2014. "Modeling Warfare in Social Animals: A "Chemical" Approach," PLOS ONE, Public Library of Science, vol. 9(11), pages 1-12, November.
  • Handle: RePEc:plo:pone00:0111310
    DOI: 10.1371/journal.pone.0111310
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    References listed on IDEAS

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    1. Jerome Bracken, 1995. "Lanchester models of the ardennes campaign," Naval Research Logistics (NRL), John Wiley & Sons, vol. 42(4), pages 559-577, June.
    2. Eldridge S. Adams & Michael Mesterton-Gibbons, 2003. "Lanchester's attrition models and fights among social animals," Behavioral Ecology, International Society for Behavioral Ecology, vol. 14(5), pages 719-723, September.
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