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The Distribution of British Liverworts: A Statistical Analysis

M. C. F. Proctor
Journal of Ecology
Vol. 55, No. 1 (Mar., 1967), pp. 119-135
DOI: 10.2307/2257721
Stable URL: http://www.jstor.org/stable/2257721
Page Count: 17
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The Distribution of British Liverworts: A Statistical Analysis
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Abstract

The records of 317 species and varieties of hepaticae in the 152 vice-counties of Great Britain and Ireland have been subjected to association-analysis, yielding twenty-five `normal' groups of vice-counties and forty-seven `inverse' groups of species. The vice-county groups, and the distribution of a selection of the species groups, are illustrated in a series of maps. The `normal' analysis emphasizes the phytogeographical boundary between `highland' and `lowland' Britain (which is important also for mosses and flowering plants), and a line demarcating the areas with the richest hepatic floras farther west. A number of clear geographical groupings emerge from the inverse analysis. Principal component analyses of the two-way table give ordinations of the groups in which the first three components reflect (a) abundance or richness, (b) the contrast between the mountainous north and west and the south-eastern lowlands, and (c) that between oceanic and montane distributions.

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