Biology – Quantitative Biology – Populations and Evolution
Scientific paper
2006-11-07
Phys. REv. E 75, 051920 (2007). (17 pages)
Biology
Quantitative Biology
Populations and Evolution
28 pages, 18 figures. Significantly expanded discussion of community structure and comparison with real food webs. Phys. Rev.
Scientific paper
10.1103/PhysRevE.75.051920
We study an individual-based predator-prey model of biological coevolution, using linear stability analysis and large-scale kinetic Monte Carlo simulations. The model exhibits approximate 1/f noise in diversity and population-size fluctuations, and it generates a sequence of quasi-steady communities in the form of simple food webs. These communities are quite resilient toward the loss of one or a few species, which is reflected in different power-law exponents for the durations of communities and the lifetimes of species. The exponent for the former is near -1, while the latter is close to -2. Statistical characteristics of the evolving communities, including degree (predator and prey) distributions and proportions of basal, intermediate, and top species, compare reasonably with data for real food webs.
Rikvold Per Arne
Sevim Volkan
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