Oystercatcher

5 plain rings

Details

coordinator
Bruno Ens
website http://www.wadertrack.nl/
cr-birding https://cr-birding.org/node/5552
Facebook https://www.facebook.com/groups/561226187257465/
ring area The Netherlands, near Delfzijl
animals 122
observations 808, of which 122 are captures
ringed in 1999 to 2001

In the years 1999-2001 Oystercatchers breeding on the havenschermpier in Delfzijl were caught and individually colour-marked by the former RIKZ to study how patch and prey choice impacted the intake of toxic chemicals. This population study has been continued by Sovon and both adult breeders and nearly fledged chicks are marked.

Observations of these marked animals allow us:

  1. To estimate (annual) survival and investigate which factors impact survival (age, quality breeding habitat, 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.

This project is a cooperation between NABU, NIOO-KNAW, Sovon Vogelonderzoek Nederland, Stichting Onderzoek Scholekster (SOS), RuG en WMR.

Example bird

 
   
 
 
 
 
Shorthand: LO-GBGG explanation
This is an arbitrary example of a bird that might not exist.

Data entry