Quantification of Conservation Criteria Using Invertebrates

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Abstract
(1)Rarity indices and typicalness measurements were generated for sites within habitat groups defined by classifications of water and ground beetle communities in north-east England (UK). (2) Differences in the rarity values of sites were most easily interpreted when a geometric scale was used to calculate species rarity scores and when the estimate was standardized by the number of species. (3) Inclusion of an extra weighting for associations of rare species led to sites that were likely to have the highest conservation potential being more easily distinguished. (4) Measurements of site typicalness were made using ordination scores derived from detrended correspondence analysis. Of the two methods attempted, the most appropriate calculations of site typicalness were those based on ordination scores derived from analyses of individual habitat group data rather than those derived from analyses of all data. (5) No consistent relationship between measurements of site rarity value and typicalness was found, in contrast to accepted thought.

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