Abstract
This paper provides a method for the evaluation of the relative importance of different parts of extensive geographical areas for birds. It uses data from the 'New Atlas of Breeding Birds: 1988–¸1991' at the 2-km and at the 10-km square scale in a case study of the uplands of northern England. Six important bird areas are identified, each consisting of a series of 2-km squares holding at least 1.5 times the mean regional species-richness and importance index of upland birds. Their relationships to existing Sites of Special Scientific Interest, Important Bird Areas and proposed Special Protection Areas are discussed.
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