| Issue |
EPL
Volume 87, Number 2, July 2009
|
|
|---|---|---|
| Article Number | 28001 | |
| Number of page(s) | 5 | |
| Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
| DOI | https://doi.org/10.1209/0295-5075/87/28001 | |
| Published online | 28 July 2009 | |
Non-neutral theory of biodiversity
1
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: gbiancon@ictp.it
Received:
19
May
2009
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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