Berlin 2018 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 73: Poster: Networks, Chimera, Energy Systems
DY 73.1: Poster
Thursday, March 15, 2018, 15:30–18:00, Poster A
Reconstructing food webs from time series — •Bernd Fernengel1, Jose Casadiego2, and Marc Timme2 — 1Instituts für Festkörperphysik, Technische Universität Darmstadt, Hochschulstraße 6, 64289 Darmstadt — 2cfaed - Center for Advancing Electronics Dresden, Technische Universität Dresden, Zellescher Weg 17, 01069 Dresden
Feeding relations in food webs (networks of 'who eats whom' in an ecosystem) determine the time evolution of the biomass of each species. Yet, such links are difficult to be measured directly and are often inaccessible. State-of-art approaches rely on time series of biomasses to establish links between species via pairwise statistical dependencies, although these are prone to recover indirect interactions. Here, we extend the Algorithm for Revealing Network Interactions (ARNI) and demonstrate that sufficiently long time series of biomasses reveal the actual topology of food webs. Furthermore, we show that our approach also determines whether a species has a positive or a negative influence on other species, which is crucial given that a single species interacts with both its predators and preys. Finally, we compare the performance of our approach with other benchmarks and discuss scalability for increasing food web sizes.