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SYBN: Biological and Social Networks

SYBN 3: Biologische und Soziale Netzwerke, Postersitzung

SYBN 3.24: Poster

Monday, March 7, 2005, 14:00–15:30, Poster TU E

On an evolutionary food web model with foraging effect — •Satoshi Uchida and Barbara Drossel — Institut für Festkörperphysik, TU Darmstadt, Hochschulstr. 6, D-64289 Darmstadt, Germany

We present numerical evidence that all food webs obtained by evolutionary models, that simply combine the population dynamics with conventional functional responses (Lotka-Volterra type, Holling type, Beddington type) and a long term change in the topology of the webs due to evolutionary changes of species, are unstable and collapse eventually. We explain the findings first of all, and in order to get stable complex food webs, we propose a more realistic model in which the flexible behaviour of predators based on the foraging theory is taken into acount. We show the evolution and the structure of webs obtained by computer simulations of the model in the poster.