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Nature 394, 620-621 (13 August 1998) | doi:10.1038/29177

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Ecology and statistics:  Nonlinear sheep in a noisy world

Nils Chr. Stenseth1 & Kung-Sik Chan2

Population ecologists have long been interested in two key topics1: the first is the relative importance of intrinsic factors (such as the inhibition of reproduction at high population densities) and extrinsic environmental variations in determining population fluctuations; the second is nonlinearity in the processes that generate these fluctuations. On page 674 of this issue, Grenfell and co-workers2 discuss both of these issues.

  1. Nils Chr. Stenseth is in the Division of Zoology, Department of Biology, University of Oslo, Blindern, N-0316 Oslo, Norway.
    e-mail: Email: n.c.stenseth@bio.uio.no.
  2. Kung-Sik Chan is in the Department of Statistics and Actuarial Science, University of Iowa, Iowa City, Iowa 52242, USA.
    e-mail: Email: kchan@stat.uiowa.edu.