%0 Journal Article
%T Non-neutral theory of biodiversity
%A Ginestra Bianconi
%A Luca Ferretti
%A Silvio Franz
%J Quantitative Biology
%D 2009
%I arXiv
%R 10.1209/0295-5075/87/28001
%X We present a non-neutral stochastic model for the dynamics taking place in a meta-community ecosystems in presence of migration. The model provides a framework for describing the emergence of multiple ecological scenarios and behaves in two extreme limits either as the unified neutral theory of biodiversity or as the Bak-Sneppen model. Interestingly, the model shows a condensation phase transition where one species becomes the dominant one, the diversity in the ecosystems is strongly reduced and the ecosystem is non-stationary. This phase transition extend the principle of competitive exclusion to open ecosystems and might be relevant for the study of the impact of invasive species in native ecologies.
%U http://arxiv.org/abs/0903.1753v2