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DY: Dynamik und Statistische Physik

DY 26: Fluktuationsinduzierte Ordnung

DY 26.3: Vortrag

Dienstag, 28. März 2000, 17:30–17:45, H2

Behavioral stochastic resonance: How a gang betrays its outpost — •Jan A. Freund¹, Jochen Kienert¹, Lutz Schimansky-Geier¹, Beatrix Beisner², David Russell³, Alexander B. Neiman³, and Frank Moss³ — ¹Institut für Physik, Humboldt-Universität, Invalidenstr. 110, 10115 Berlin, GERMANY — ²Department of Zoology, 6270 University Boulevard, University of British Columbia, Vancouver, BC, Canada V6T 1Z4 — ³Center for Neurodynamics, University of Missouri at St. Louis, 8001 Natural Bridge Road, St. Louis, MO 63121, USA

The juvenile paddlefish preys on single daphnia (zooplankton) by tracing a weak electric subthreshold signal emitted by the daphnia at a frequency of about 5 Hz. In the context of stochastic resonance the task of detection and tracing is expected to benefit from some external noise source. In this talk we discuss the possibility that a nearby swarm of daphnia might provide the beneficial noise background. We calculate the spatial distribution of the spectral power amplification for static daphnia and swarm positions. The results predict a specific attack pattern of the paddlefish. Theoretical implications are compared with biological experiments.