The Behavioural Basis of Redistribution I. The Delta -Model Concept

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Abstract
A conceptual model is developed in which spatial behavior is density-dependent. The behavior is classified as congregatory or migratory according to whether it results in movement towards or away from population concentrations. Spatial behavior is shown to result from both individual and population interactions. The stability properties of the model are explored and it is shown how, under particular conditions, populations obeying the model have a population density regulating mechanism. The similarity between the model and the potential energy curve of physics is noted, but it is emphasized that this is a behavioral not a physical model.