Artificial islands for the Black Terns
CABS project for the protection of endangered birds in Brandenburg and Saxony-Anhalt
Black terns have high demands on their breeding grounds: They must be undisturbed waters, not too shallow and not too deep, sunny, without currents and above all they must have one thing: Plenty of aquatic plants. The black beauties build their nests on dead plant parts that float on the surface of the water. This breeding preference is so rare today, the Black Tern has been brought to the brink of extinction. In the North German Plain about 1,000 to 1,300 pairs still breed today, in the last thirty years their population in Germany has decreased by more than 50 %.
The European comparison is also a real tragedy: In all Western and Southern European countries the Black Tern is in significant decline, only in Eastern Europe are the populations still relatively stable. But here, too, the large remaining natural landscapes are threatened by the intensification of agriculture, road construction and monoculture.