Parallels are drawn between the movement and distribution of particles in a phase space and of arthropods in agroecosystems. Suppose the movement of each arthropod is modeled by a Markov process with a common transition function which is doubly stochastic and irreducible.If the interaction among arthropods is such that the time until an arthropod moves is exponentially distributed with a mean proportional to the number of arthropods on the same minor habitat, then the Bose-Einstein distribution is the equilibrium distribution. Application is made to arthropods commonly found in cotton.