Exploitation and Interference in Interspecies Competition

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Abstract
Analysis of interspecies competition into 2 components, exploitation and interference, is examined from the theoretical point of view. Model due to Winsor need involve no interference at all, simply competition by exploitation for essential common resources; that used by Volterra and by Lotka is quite different: it involves competition by interference alone between spp. having no common resources whatsoever. The 2 models represent isolated components of the dual competition concept. Only Winsor model predicts unconditional segregation in an environment that is heterogeneous in a way affecting exploitation coefficients. Difference between these coefficients affects rate of completion of a process. In the Lotka-Volterra model segregation is assumed to exist beforehand in a sense that does not preclude the possibility of interference, so that where segregation is on a small scale and spp. are highly interspersed it can happen, especially if the interference coefficients are materially different, that a further larger scale segregation will develop although resources vacated by the loser within these new areas will not be occupied by the winner but merely patrolled. A stochastic model analagous with the exploitation competition model is considered.

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