Abstract
We consider a model in which agents of different species move over a complex network, are subject to reproduction and compete for resources. The complementary roles of competition and diffusion produce a variety of fixed points, whose stability depends on the structure of the underlying complex network. The survival and death of species is influenced by the network degree distribution, clustering, degree-degree correlations and community structures. We found that the invasion of all the nodes by just one species is possible only in Erdos-Renyi and regular graphs, while networks with scale--free degree distribution, as those observed in real social, biological and technological systems, guarantee the co-existence of different species and therefore help enhancing species diversity.
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