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Joel E. Cohen
Abby Rockefeller Mauzé Professor

Postdoc Fellow (advisor: Dr. Joel Cohen)
Laboratory of Populations, Box 20
The Rockefeller University
1230 York Ave
New York, NY 10021


Ph.D. 1998. Washington State University, Pullman, WA, USA.
Ph.D. 1994. University of Avignon and the National Institute for Agricultural Researches, France.
MS.1985. Henan Agricultural University & Nanjing Agricultural University, P.R. China.
BS. 1982. Henan Agricultural University, Zhengzhou, P.R. China.

Professional experience

Postdoctoral Fellow. 03/1999 ~ 10/2000. Rockefeller University, New York,.
Postdoctoral Associate 06/1998 ~ 03/1999. Texas A&M University, College Station, TX.
Research Assistant. 09/1993 ~ 05/1998. Washington State University, Pullman, WA.
Research Assistant. 02/1991 ~ 08/1993. National Institute for Agricultural Researches, France.
Instructor. 03/1985 ~ 02/1991. Henan Agricultural University. Zhengzhou, P. R. China.

Research Interests

  • Complexity of ecological systems; periodic and chaotic motions; transient behaviors
  • Multi-species assemblages and food web dynamics; community organization and structure
  • Ecosystem responses to environmental disturbances; ecological risk assessment
  • Population dynamics and species interactions
  • Adaptive dynamics and evolution; invasion and extinction
  • Modeling of ecological systems; numerical experiment with simulation models


Chen, X. and J. E. Cohen. 2001. Transient dynamics and food web complexity in the Lotka-Volterra cascade model. Proc. R. Soc. Lond 268: in press.

Chen, X. and J. E. Cohen. 2001. Support of hyperbolic connectance hypothesis by qualitative stability of model food webs. Community Ecology 1: 215-225.

Chen, X. and J. E. Cohen. 2001. Global stability, local stability and permanence in model food webs. submitted.

Chen, X. and J. E. Cohen. 2001. Population fluctuation and food web complexity in model food webs. submitted.

Berryman, A. A. and X. Chen. 1999. Population cycles: the relationship between cycle period and reproductive rate depends on the relative dominance of bottom-up or top-down control. Oikos 87: 589-593.

Berryman, A. A. and X. Chen. 1997. Mechanisms and properties of ratio-dependent multi-trophic models with particular reference to logistic food webs. In Baugartner J. U. and B.F.J. Manly (Eds), Population and Community Ecology for Insect Management and Conservation. A.A. Balkema Publishers. Rotterdam.

Lenfant C., A. Lyoussoufi, X. Chen, F. Faivre d'Arcier and B. Sauphanor. 1994. Predatory potentials of Forficula auricularia on the pear psyllid Cacopsylla pyri. (In French). Entomologia Experimentalis et Applicata 73:51-60.

Chen X., B. Souphanor, F. Faivre d'Arcier, R. Rieux. 1993. Effectiveness of Anthocoris nemoralis and Orius majusculus as predators of Cacopsylla pyri. (In French). Mededelingen van de Faculteit Landbouwwetenschappen Rijlsuniversiteit Gent.

Sauphanor B., C. Lenfent, X. Chen, O. Elsenhower. 1993. The possibility of utilization and side effects of an extract of Neem (Azadirachta ndicata) in peach orchard. (In French). IOBC/WPRS Bulletin Vol.16(4).