Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
Cachinnans - nest Lelystad 203
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 203 positioned on dam 2, 10 mtr E of lighthouse, on top of dam, only 2 meters between nest 203 and nest 204.
- ID certain in 2022: both adult cachinnans.
| location | April 19th, 2022: location of nest (view from N). | April 15th, 2022: nest with 2 eggs. | April 29th, 2022: full clutch, 3 eggs. |
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| partner 1 | May 1st, 2022: location of nest (view from N). | May 1st, 2022: male, with broken band on P9. | May 1st, 2022: male, with broken band on P9. |
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| partner 2 | May 1st, 2022: location of nest (view from N). | May 1st, 2022: female, with broad band on P9. | May 1st, 2022: female, with broad band on P9. |
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| pullus | May 17th, 2022 pullus r[5.6]. | September 13th, 2022 juvenile r[5.7] at Guernsey. | . |
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Visits and data.
| nest 203 | Date A egg: April 11 2022 | hatch A egg: May 9 2022 | ring pulli: May 16 2022. | ||||
| 15-04-2022 | 2 ei | A egg | 74,5 | 52,2 | tip bottom - 20 gr | nest 10 mtr E of lighthouse | |
| B egg | 74,2 | 52,7 | tip bottom - 10 gr | code 203 sprayed on block & red spot next to nest. | |||
| 29-04-2022 | 2 ei | A egg | float - 1 mm | ||||
| B egg | float - 2 mm | ||||||
| C egg | 69,2 | 50,2 | float - 1 mm | ||||
| 01-05-2022 | 2 adult cachinnans at nest site | ||||||
| 04-05-2022 | adults: 2 birds present, photographed | ||||||
| metal | colour | mass | |||||
| 17-05-2022 | .5625142 | r-57 | 176 | ||||
| .5625143 | r-56 | 239 | |||||
| 2-jun-22 | adult + 2 ringed chicks near lighthouse. |
| 21-06-2022 | r56 & r57 flying and swimming + parent defending chicks |
| 12-07-2022 | r-56 picture. |
| 17-07-2022 | r-56 en r-57 picture. |