Interpretation of a Vegetational Mosaic on Limestone in the Island of Gotland

Gimingham, C. H.; Pritchard, N.M.; Cormack, R. M.

doi:10.2307/2257963

Cited by 13 publications

(4 citation statements)

References 7 publications

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“…Recent studies have shown that essentially similar ordinations of natural data are obtained when different importance measures are used ( Gimingham et al 1966, Bannister 1966, Goff and Cottam 1967. However, a readily interpretable presentation of species relations cannot be implied from the consistency of the results alone because bellshaped curves and zero values may distort all ordination patterns compared.…”

Section: Specific Comments On Current Uses Of Ordinationmentioning

confidence: 99%

“…Attempts to evaluate this type of ordination for the display and interpretation of vegetational patterns have been largely based on analyses of natural data (e.g., Gittins 1965a, b, Gimingham, Pritchard, and Cormack 1966, Orloci 1966, Goff and Cottam 1%7, Bannister 1968). However, relational patterns among many species in an area are obscured by chance circumstances, by local environmental effects, and by sampling errors.…”

Section: Introductionmentioning

confidence: 99%

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An Examination of Some Ordination Problems By Use of Simulated Vegetational Data

Swan

1970

Ecology

178

126

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.Wiley is collaborating with JSTOR to digitize, preserve and extend access to Ecology Abstract. Hypothetical vegetation models were made to simulate numerical changes in species populations along a single environmental gradient. A single ordination procedure was evaluated by its ability to detect the ecological information in the hypothetical models. The procedure was reasonably successful when the data were drawn from a short length of the gradient but became progressively less so as longer lengths of the environmental gradient were included in the data. This parallels an increase in the number of stands from which each species is absent in the total data set. Zero values appear to mask ecological information, and an intuitive method of assigning "degree of absence" values to the data is described. After this adjustment, ordination patterns were easier to interpret because ecological information was concentrated in fewer axes.

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Section: Specific Comments On Current Uses Of Ordinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Examination of Some Ordination Problems By Use of Simulated Vegetational Data

Swan

1970

Ecology

178

126

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“…The main limitation of the method is that the subjective ordering of dominants becomes difficult when there are more than about five of them, or when a single overriding gradient cannot account for most of the variation (Gimingham et al, 1966;Buell et al, 1966). In any case only one such catena can be extracted.…”

Section: A Leading Dominants Methodsmentioning

confidence: 99%

Catenation: Quantitative methods for the definition of coenoclines

Noy‐Meir

1974

Plant Ecol

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“…The transformation improves DA V (the measure of distortion on the first axis) in the range of 0 to 5 half-changes. Thus the most appropriate transform should be neither the logarithm (Frydman and Whittaker 1968), nor arcsin (Loucks 1962), nor reciprocal ( Gimingham et a!. 1966), but the inverse of a complemented, non-standardized error function.…”

Section: Half-changesmentioning

confidence: 99%

The Relationship Between Sample Similarity and Ecological Distance

Gauch¹

1973

Ecology

103

140

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Similarity measures for samples from natural communities show a complex, curvilinear decrease with increasing separation of samples along environmental gradients. The form of this decrease for samples without sampling errors has been analyzed and found to be a complement of a non-standardized error function for percentage similarity, and similar functions for coefficient of community and Euclidean distance. For samples affected by sampling error, altered and somewhat flattened curves result. These relationships are important in many ordination techniques. In particular. it is demonstrated that Bray-Curti~ ordination can be improved by application of the inverse function transforms with moderate beta diversity (up to 5 half-changes). Such tramforms produce similarity measures which are linear with respect to separation along the gradient, up to the point beyond which samples have practically no species in common and similarity measures of any sort are consequently meaningless.

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Interpretation of a Vegetational Mosaic on Limestone in the Island of Gotland

Cited by 13 publications

References 7 publications

An Examination of Some Ordination Problems By Use of Simulated Vegetational Data

An Examination of Some Ordination Problems By Use of Simulated Vegetational Data

Catenation: Quantitative methods for the definition of coenoclines

The Relationship Between Sample Similarity and Ecological Distance

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