Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
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International trend
National trend
Site characteristics
Breeding biology
Fecundity
Food resources
Nonbreeding season
Breeding species
Hybrid scores
Ring codes
Future
Nests at De Kreupel 2020
nest r-02P4 20
nest y-X804 20
nest D01 20
nest D02 20
nest D03 20
nest L01 20
nest L02 20
nest L03 20
nest M02 20
Nests at De Kreupel 2021
nest r-02P4 20
nest w-201U 21
nest g-XLHD 21
nest r-KA 21
nest r-KB 21
nest r-KC 21
nest r-KD 21
nest r-KE 21
nest r-KF 21
nest r-KH 21
nest r-KJ 21
nest r-KK 21
nest A01 21
nest C03 21
nest C04 21
nest C06 21
nest D01 21
nest D03 21
nest D05 21
nest D06 21
nest D07 21
nest D08 21
nest E01 21
nest H01 21
nest L01 21
nest L02 21
nest L05 21
nest L06 21
nest L07 21
nest M01 21
nest M04 21
nest M06 21
nest Q01 21
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Cachinnans - nest De Kreupel D02 20
General remarks:
- Eggs: Volume measured by Stonehouse (1964) and Spaans & Spaans (1975), which make comparison possible with data from Texel (Camphuysen pers comm 16.04.2020).
- Nest on island "D", positioned in SE corner.
- One parent is pure cachinnans, colour-ringed but code uncertain.
- Two large pulli ringed, late in season. Both birds: pale inner primaries (pale window) and tertial pattern, together with obvious gonys angle on one bird, may hint to argenteus blood.
location |
Parent is colour-ringed. Date: June 12th, 2020. |
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juveniles |
June 12th, 2020 pullus p[FA]. |
June 12th, 2020 pullus p[FB]. |
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Visits and data.
date: |
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WING: |
HEAD + BILL: |
BILL: |
WEIGHT: |
Comments: |
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12-6-2020 |
pullus |
NLA 5.545.451 & p[FA] |
306.5 |
118.2 |
47.9 |
1108 |
2 pulli ringed at colour-ringed parent nest. |
12-6-2020 |
pullus |
NLA 5.545.452 & p[FB] |
279.5 |
108.5 |
44.1 |
880 |
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