Non-neutral theory of biodiversity

Details Non-neutral theory of biodiversity Non-neutral theory of biodiversity

2009-03-10

arxiv.org/abs/0903.1753v2

Europhys. Lett. 87, 28001 (2009)

Biology

Quantitative Biology

Populations and Evolution

4 pages, 3 figure

Scientific paper

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.

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