title: Active motion, communicative aggregations, and the spatial closure of Umwelt.
abstract: On the basis of a simple model of movable organisms that are supplied by semiotic force of attraction or repulsion, several general features of spatial behavior are demonstrated: (1) the stochastic spatial distribution of actively moving organisms is unstable; (2) simple or complex aggregations of organisms appear as a result of active motion; and (3) the ability for active motion ties the organisms with place. These results show that models that apply an internalist approach can considerably simplify the theory of spatial behavior of organic systems. Explanations based on the effects of Darwinian fitness may not be necessary for understanding the origin of biological aggregations.
authors.affiliation: Department of Semiotics, University of Tartu, Estonia. kalevi@zbi.ee
authors.forename: K
authors.initials: K
authors.lastname: Kull
mesh_terms: D000818:Animals; D003142:Communication; D008954:Models, Biological; D009068:Movement