Long-term correlations in the surface behavior of dolphinsR. Ferrer i Cancho1 and D. Lusseau2
1 Dipartimento di Fisica, Università "La Sapienza" - Piazzale A. Moro 5 00185 Roma, Italy
2 University of Aberdeen, School of Biological Sciences - Lighthouse Field Station George St. Cromarty, Ross-shire, IV11 8YJ, Scotland, UK
received 17 August 2005; accepted in final form 26 April 2006
published online 26 May 2006
Here we study the sequences of surface behavioral patterns of dolphins (Tursiops sp.) and find long-term correlations. We show that the long-term correlations are not of a trivial nature, i.e. they cannot be explained by the repetition of the same surface behavior many times in a row. Our findings suggest that dolphins have a long collective memory extending back at least to the 7-th past behavior. As far as we know, this is the first evidence of long-term correlations in the behavior of a non-human species.
87.23.Ge - Dynamics of social systems.
89.70.+c - Information theory and communication theory.
87.53.Wz - Monte Carlo applications.
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