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Non-linear ordination in several dimensions

A maximum likelihood approach

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Abstract

A method is described for fitting a model in which site characteristics are represented by a set of orthogonal axes, while the probability that a particular species will be present, and its quantity if it is present, are each related to the axes of the system by symmetrical hypersurfaces with an optimum, decreasing asymptotically to zero as conditions depart from the optimum. The method needs initial estimates of the positions of the sample sites within the axis system. Given these starting points, they can be progressively improved by an iterative procedure. Results are reported of an extensive series of tests using artificial data, and of an analysis of field data from brigalow woodland in Queensland.

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Authors and Affiliations

  1. CSIRO Division of Land Resources Management, Private Bag, 6014, Wembley, W.A., Australia

    D. W. Goodall

  2. Department of Primary Industries, Queensland Herbarium, Meiers Road, 4068, Indooroopilly, Qld, Australia

    R. W. Johnson

Authors
  1. D. W. Goodall
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  2. R. W. Johnson
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Goodall, D.W., Johnson, R.W. Non-linear ordination in several dimensions. Vegetatio 48, 197–208 (1982). https://doi.org/10.1007/BF00055261

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  • DOI: https://doi.org/10.1007/BF00055261

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