hierarchical competition models

Come together

Aggregation of objects is widespread phenomena in several sciences and of course in biology and ecology. Two cases I found and seem interesting to me are: the aggregation in niche space: The clumping transition in niche competition, and the aggregation in neutral models: Clustering in neutral ecology.\ This seems to depend only on the discreteness and finiteness of the objects and space. And in both cases the clumps have sizes distributed as power laws.