Oystercatcher
5 plain rings
Details
| coordinator |
St. Ond. Scholekster (Bruno Ens)
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| website | https://www.scholekster.org/waarnemers-en-fotografen |
| cr-birding | https://cr-birding.org/node/5552 |
| https://www.facebook.com/groups/561226187257465/ | |
| ring area | The Netherlands, near Delfzijl |
| animals | 122 |
| observations | 897, of which 133 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:
- To estimate (annual) survival and investigate which factors impact survival (age, quality breeding habitat, quality wintering habitat, winter weather).
- 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.
- 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 https://www.chirpscholekster.nl/">dramatic population decline of this longlived species (current record 46 years) in the Netherlands : due to an annual decrease of 5%, the population has https://www.sovon.nl/nl/soort/4500/">more than halved since 1990.
This project is a cooperation between https://bergenhusen.nabu.de/">NABU, https://nioo.knaw.nl/nl/">NIOO-KNAW, https://www.sovon.nl/">Sovon Vogelonderzoek Nederland, https://www.scholeksterophetdak.nl/over-ons/">Stichting Onderzoek Scholekster (SOS), https://www.rug.nl/">RuG en https://www.wur.nl/en/Research-Results/Research-Institutes/marine-research.htm">WMR.
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