Abstract
Previous studies have shown a relationship between the number of Dunlin breeding on moorland sites in Caithness and Sutherland and the near-infrared reflectance of the sites measured from satellite imagery. We test the generality of this relationship using two images of Caithness and Sutherland recorded 12 years apart, and new imagery and survey data from the Shetland Islands. The correlation between Dunlin abundance and near-infrared reflectance is similar using both images of Caithness and Sutherland but no correlation is apparent in Shetland. This regional difference is explained by relating the spectral characteristics of sites in both study areas to ground cover data recorded from field surveys.
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