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Discrete Packing of Species

This figure shows the changes in time (vertical axis, from bottom to top) of the abundances of competing species distributed in one dimensional niche space (horizontal axis).

The Effect of Predators

Without predators, the system converges to the community of two species, instead of 4, in the left figure. This figure shows the corresponding changes in predator species abundances.

Akira Sasaki is Associate Professor of Mathematical Biology, Faculty of Science, Kyushu University, Fukuoka, Japan since 1996, and is a research associate of the Adaptive Dynamics Network Program, International Institute for Applied Systems Analysis (IIASA), Laxenburg, Austria, which he joined in September 2005. He is working on the stochastic theory of population genetics, host-parasite coevolution, species packing theory, spatially explicit models of ecology and epidemiology, intrahost dynamics of pathogen and immune system, bet-hedging in changing environment, evolution of cooperation, evolution of mutability in fitness landscapes, restriction avoidance and the evolution of word frequency in phage genome, spatial mosaic formation in Mullerian mimicry system, epidemiology and evolution of virulence in small worlds networks, and on problems in theoretical population biology.

Dr. Sasaki received his Ph.D. from Kyushu University in 1989. He became Assistant Professor of mathematical biology at Kyushu University in 1989. Since 1996, he has been Associate Professor of mathematical biology at Kyushu University. He has been a visiting research fellow at North Carolina State University, USA (1993-1994), the University of Utrecht, the Netherlands (1997), University College London Silwood Park, UK (1998, 1999), Oxford University, UK (1998, 1999), Institute for Advanced Study, USA (2001-2002), and Harvard University, USA (2003).


Akira Sasaki | Mathematical Biology Group | Department of Biology | Faculty of Science | KyushuUniversity