Regensburg 2016 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 53: Posters - Statistical Physics of Biological Systems

BP 53.4: Poster

Mittwoch, 9. März 2016, 17:00–19:00, Poster C

Species diversity in meta-foodwebs consisting of several patches coupled by stochastic migration — •Tatjana Thiel and Barbara Drossel — Institut für Festkörperphysik, TU Darmstadt, Germany

The structure of space has a considerable influence on the stability and diversity of ecosystems. So far, there are only few theoretical studies investigating the population dynamics of systems consisting of many species that can migrate between several patches, and most of these model migration as a continuous, deterministic process. However, when migration events are rare (for instance because the patches are far apart), migration is a stochastic process and should be modelled accordingly.

To this purpose, we place a foodweb model consisting of many species on a system of several patches and evaluate the stable configurations that arise due to the population dynamics. This dynamics has a deterministic contribution from the processes within a patch, and a stochastic contribution due to migration events, which are implemented using the Gillespie algorithm. We explore the different ways in which migration rates can depend on population sizes and body masses.

We will discuss how the local and regional species diversity depend on the mode and frequency of migration. Typically, local diversity is largest with intermediate migration rates, since migration is frequent enough that species can be rescued from extinction by immigration but not so frequent that all patches have an identical species composition.