Volume 87, Number 2, July 2009
|Number of page(s)||5|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||28 July 2009|
Non-neutral theory of biodiversity
The Abdus Salam International Center for Theoretical Physics - Strada Costiera 11,34014 Trieste, Italy, EU
2 Facultat de Veterinaria and IFAE, Universitat Autonoma de Barcelona - 08193 Bellaterra, Spain, EU
3 LPTMS, UMR 8626 CNRS et Université Paris-Sud, Bâtiment 100 - 91405 Orsay Cedex, France, EU
Corresponding author: firstname.lastname@example.org
Accepted: 25 June 2009
We present a non-neutral stochastic model for the dynamics taking place in a meta-community ecosystems in the 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 extends the principle of competitive exclusion to open ecosystems and might be relevant for the study of the impact of invasive species in native ecologies.
PACS: 87.23.-n – Ecology and evolution / 89.75.-k – Complex systems / 89.75.Da – Systems obeying scaling laws
© EPLA, 2009
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