Abstract
Rare habitats are increasingly threatened by fragmentation and measures are required to conserve these valuable resources. Here, we present a method of targeting habitat patches for conservation using a Geographical Information System. We ranked patches of chalk grassland in the Chiltern Hills Area of Outstanding Natural Beauty using simple abiotic criteria, namely: patch area, patch shape, proximity to areas of the same habitat and surrounding land-use type. We compiled a regionally specific list of indicator species and ranked the habitat patches based on their alpha diversity (calculated from species richness). We compared the results of the two ranking schemes and identified key aggregations of the existing reserve network. These could form the basis of future habitat expansion as required by the United Kingdom Biodiversity Action Plan.
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