Fussmann, G. Cornell University, gff1@cornell.edu
Ellner, S. North Carolina State University, ellner@eos.ncsu.edu
Hairston, Jr., N. G. Cornell University, ngh1@cornell.edu

 
EVALUATING COMPLEX DYNAMICS AND CHAOS IN NATURAL ECOLOGICAL SYSTEMS: A ROTIFER CHEMOSTAT PROJECT
 
In an attempt to advance our understanding of complex dynamics in ecological systems we use real organisms to create data sets that demonstrably exhibit complex nonlinear dynamics, either chaos or complicated periodic oscillations. The experimental system is a single-stage chemostat culturing rotifers (Brachionus calyciflorus) and their algal food (Chlorella vulgaris), with variable food supply rate of the nutrient limiting algal growth (nitrate). This system can be maintained under conditions where predator-prey oscillations occur. Mathematical theory and a modelling approach suggest that such oscillations can be driven into complex mode-locking oscillations, and eventually into chaos, by pulsed or periodically varying nutrient supply rate.
 
Day: Tuesday, Feb. 2
Time: 04:45 - 05:00pm
Location: Hilton of Santa Fe
 
Code: CS67TU0445H