Construct · 1 fields · 2 citations

ordination: a standalone construct

One name. One construct. A landmark on the map.

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ordination1 CONSTRUCTOrdination (stats)GOODALL · GRADIENT SPACE

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Ecology (vegetation science)

Arranging samples in multivariate space along environmental gradients

In community ecology, ordination is a family of multivariate techniques that arrange sampling units (plots, quadrats) in a low-dimensional space so that their positions reflect similarities in species composition and, by extension, the underlying environmental gradients. David W. Goodall introduced the word to ecology in his 1954 paper in the Australian Journal of Botany, applying factor analysis to vegetation, and the approach was later sharpened by gradient-based methods such as Cajo ter Braak's 1986 canonical correspondence analysis in Ecology. The referent is a geometric ordering of data points, measured as coordinates on ordination axes, not the religious rite of the same name, in which a person is set apart for ministry.[1][2]

Unit
One sample's position on a set of ordination axes
Recovery means
Re-run the ordination on the species-by-site matrix; a sample's axis scores reproduce its placement
Measured by
Computed as eigenvector/axis scores from a species-by-site matrix (e.g., PCA, CA, CCA, NMDS)

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Nearby constructs

community5 fields · 7 citationsjingle · one word, five constructscomposition3 fields · 3 citationsjingle · one word, three constructscorrespondence4 fields · 7 citationsjingle · one word, four constructs

References

  1. Goodall, D. W. (1954). Objective methods for the classification of vegetation. III. An essay in the use of factor analysis. Australian Journal of Botany, 2(3), 304–324. https://doi.org/10.1071/BT9540304
  2. ter Braak, C. J. F. (1986). Canonical correspondence analysis: A new eigenvector technique for multivariate direct gradient analysis. Ecology, 67(5), 1167–1179. https://doi.org/10.2307/1938672

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