Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DY: Fachverband Dynamik und Statistische Physik
DY 29: Poster - Active Matter, Microswimmers and -fluidics, Statistical Physics Biosystems
DY 29.9: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster C
The evolution of network structure in an evolutionary food-web model without explicit population dynamics — •Tobias Rogge1, Korinna T. Allhoff2, and Barbara Drossel1 — 1TU Darmstadt, Germany — 2UPMC Paris, France
Evolutionary foodweb models provide important insights into the stability and the functioning of ecosystems, since the network structure is a highly nontrivial outcome of the ongoing processes of species addition and species deletion. Here, we introduce and investigate an evolutionary food web model that includes no population dynamics but generates nevertheless a large variety of complex, multi-trophic networks. In this model, species are characterized by a few traits that are based on their body mass and that determine the connections to other species in the network. Starting from a simple initial network, the system evolves due to the addition of new species, which are modifications of existing species. Whether a new species can survive in the network depends on a criterion that takes into account the predators, the prey, and the competitors of the new species. When the new species survives, it changes the environment for other species, which will die out if they do not fulfil any longer the survival criterion.
Depending on the parameters, the long-term dynamics of the network can show layered structures, highly dynamical configurations with frequent extinctions, or frozen configurations that allow no mutant to survive. Using computer simulations and analytical calculations, we identify the conditions under which the different types of dynamical and structural patterns emerge.