|ring area||The Netherlands, Texel|
|observations||21945, of which 695 are captures|
|ringed in||1983 to 2019|
Since 1983, Oystercatchers breeding around the Mok at the south point of the island of Texel in the Dutch Wadden Sea are individually colour-marked. Both adult breeders and nearly fledged chicks are marked.
Observations of these marked animals allow us:
1.bitat, quality wintering habitat, winter weather). 2. To determine connectivity between breeding areas and wintering areas (where do Oystercatchers that breed in a certain area spend the winter and vice versa) and the site fidelity to these areas. 3. To determine where fledged Oystercatchers settle as breeders, i.e. natal dispersal. Do they settle in the area where they grew up? If not, does the new habitat resemble the natal habitat?
This knowledge is very important to identify the causes of the dramatic population decline of this longlived species (current record 46 years) in the Netherlands : due to an annual decrease of 5%, the population has more than halved since 1990.