Fig. 3. Map showing the potential habitat for wader species in part of the New Forest. The map used generic knowledge of habitat preferences from the database of the biodiversity tool LARCH (Opdam et al. 2003, Verboom and Pouwels 2004), but was amended by adding local monitoring data and information on landscape features in the New Forest that predicted the current and historic distribution of wader species in this area. Based on local maps consisting of vegetation structure and slope the habitat was classified as optimal, suboptimal, and marginal. In optimal habitat wader species can reach high densities and in marginal habitat low densities. The monitoring data had been gathered over several years and included four wader species: Lapwing (Vanellus vanellus), Curlew (Numenius arquata), Snipe (Gallinago gallinago), and Redshank (Tringa totanus).