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Since the sixties, the population of Gull-billed Terns in Northwest Europe had declined substantially in numbers and distribution, with only one colony remaining in the German Elbe estuary nowadays. Predator-exclusion fencing led to increased reproduction in this colony. In the Netherlands, Gull-billed Terns bred regularly until around 1958 and the...
In 2017 new islands have been created in the Markermeer. The archipelago attracted many pioneer bird species and numbers and breeding success of Common Tern and Pied Avocet have been recorded. The numbers are of international importance and their reproduction was very high. So at this moment the islands contribute substantially to threatened specie...
In future the Marker Wadden should be a bird paradise. In order to study and monitor the development of the Marker Wadden, an Knowledge and Innovation Programme Marker Wadden (KIMA) has been launched. In this framework studies on bird ecology are included. Since 2017 we study bird numbers and reproductivity with a focus on Common Tern and Pied Avocet