Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-04-27
Physica A, Volume 387, Issue 11, 2631-2636 (2008)
Physics
Condensed Matter
Statistical Mechanics
Scientific paper
10.1016/j.physa.2008.01.034
We study the growth of a directed transportation network, such as a food web, in which links carry resources. We propose a growth process in which new nodes (or species) preferentially attach to existing nodes with high indegree (in food-web language, number of prey) and low outdegree (or number of predators). This scheme, which we call inverse preferential attachment, is intended to maximize the amount of resources available to each new node. We show that the outdegree (predator) distribution decays at least exponentially fast for large outdegree and is continuously tunable between an exponential distribution and a delta function. The indegree (prey) distribution is poissonian in the large-network limit.
Rikvold Per Arne
Sevim Volkan
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