Berlin 2018 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 15: Postersession III

BP 15.58: Poster

Dienstag, 13. März 2018, 14:00–16:00, Poster B

Evolution on multiple scales - merging evolution and dispersal on landscape scales — •Michaela Hamm and Barbara Drossel — Technische Universität Darmstadt, Germany

Life forms on earth are stunningly diverse. This rich variety of species evolved in time spans inaccessible to any experiment. Evolutionary food web models were developed in the last decades as tools to analyse food web emergence and persistence on long time scales. Those models are based only on a handful of mutation or adaptation rules, from which the food web structure arises naturally in a self-organized way. But ecosystems are never isolated but coupled by species dispersal, i.e., evolutionary dynamics is affected by spatial structure.

In order to obtain a model that retains essential features of older evolutionary models but allows for fast computation on many coupled habitats, we developed an new model merging the following features of models from the literature: 1) Species are characterized by traits based on body mass, following for example [1, 2]. 2) The biomass density of species is calculated self-consistently from the network of interactions by using the difference equation approach as in [3]. 3) New species are introduced into the system by varying the traits of existing species. 4) Species spread to adjacent habitats based on a stochastic migration process. The second feature, which replaces explicit population dynamics with a fast estimation of equilibrium biomasses, is crucial for scaling the model to many (i.e., several hundred) habitats. We present first results how our new model performs on a local scale. [1] Allhoff et al.(2015);[2] Rogge et al.(in prep);[3] Caldarelli et al.(1998).