Fig. 2From: Radical changes in the Wadden Sea fauna and flora over the last 2,000 yearsTrends of breeding populations in Niedersachsen, Germany, since 1946 for selected waterfowls (a), seabirds (b), shorebirds (c), and two endangered marine birds (d). Numbers in brackets indicate multiplication factor for y-axis labels. Data adapted from Behm-Berkelmann and Heckenroth (1991)Back to article page