Berlin 2018 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 22: Computational Biophysics II
BP 22.9: Vortrag
Mittwoch, 14. März 2018, 17:15–17:30, H 1058
Interplay between Spatial Dynamics and Lifetime Distributions in an Evolutionary Food Web Model — •Tobias Rogge1, Korinna T. Allhoff2, David Jones1, and Barbara Drossel1 — 1Institut für Festkörperphysik, Technische Universität Darmstadt, Germany — 2Institute of Evolution and Ecology (EvE), University of Tübingen, Germany
We study the meta-network dynamics emerging in an evolutionary food web model on a system of coupled patches in space. Species are characterized by their body mass and the body-mass interval that specifies their prey. Each patch hosts a food web that contains several trophic layers, and the species composition in the patches changes due to ongoing processes of species addition ("mutation"), migration, and interaction-dependent extinction.
The model is able to sustain a complex food web structure on each patch, while undergoing continued species replacement dynamics. In particular, we evaluate species-lifetime distributions (how long is the time span that a species can survive in the system?) and species-area relationships SAR (how many species can we find in a given area?). All these relationships resemble power laws over appropriately chosen parameter ranges and thus agree qualitatively with empirical findings. We observe strong finite-size effects, and a dependence of the relationships on the trophic layer of the species. More precisely, we find that species with larger body masses on higher trophic position generate steeper SAR.