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 229
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 229 positioned on dam 2: 25 mtr east of lighthouse, old Spoonbill nest, between bushes = nest 229-2022 of sub-adults.
- ID certain in 2022: both immature (4CY) cachinnans.
- ID certain in 2023: location now occupied by female is y-X56A (from nest 206-2022). Partner is adult male cachinnans.
| location | April 27 2023: location of nest. | May 11 2023: egg hatching. | . |
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| partner 1 | April 09 2023: cachinnans y-X56A. | April 27 2023: cachinnans y-X56A. | April 27 2023: cachinnans y-X56A. |
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| partner 2 | May 13 2023: male cachinnans partner. | May 13 2023: male cachinnans partner. | . |
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| pullus | cachinnans r-7.Y fledged in 2023. | cachinnans r-7.8 fledged in 2023. | cachinnans g-7|U fledged in 2023. |
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Visits and data:
| egg sizes & volume 2023 | ||||||||||||
| SPECIES | NEST | A_length | A_width | A_volume | B_length | B_width | B_volume | C_length | C_width | C_volume | TOTAL NEST: | known parents? |
| cach x cach | 229-2023 | 74 | 50 | 93,15 | 72,7 | 50,5 | 93,35 | 70,2 | 51,5 | 93,75 | 280,24 | X56A &cach |
| ring pulli: 15-mei | laying A egg: 10-apr | hatch A egg: 8-mei | ||||||||||
| catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | ||||||
| pullus | 11-5-2023 | 5.556.455 | r-7Y | -- | -- | -- | ||||||
| pullus | 11-5-2023 | 5.556.456 | r-78 | -- | -- | -- | ||||||
| pullus | 18-5-2023 | 5.556.410 | g-7|U | 166 | -- | 63 | ||||||
| pullus | 18-5-2023 | 5.556.455 | r-7Y | 221 | -- | 65 | ||||||
| pullus | 27-5-2023 | 5.556.410 | g-7|U | 362 | -- | -- | ||||||
| pullus | 27-5-2023 | 5.556.455 | r-7Y | 499 | -- | -- | ||||||
| pullus | 25-6-2023 | 5.556.456 | r-78 | 1028 | 355 | 128,1 | ||||||
| 229-2023 | y[X56A] is breeding in 229 (X56A was at nest 206 in 2022) | ||
| dam: | dam 2 west | ||
| location: | 25 mtr east of lighthouse, old Spoonbill nest, between bushes = nest 229-2022 of sub-adults. | ||
| breeders: | cach x cach | ||
| OBSERVATIONS: | |||
| 09-04-2023 | y-X56A present north of dam. (27/4: yX56A not breeding at this nest in 2023). | ||
| 26-04-2023 | eggs: | 3 eggs. Measured and water test: A/B/C:all are 90 - tip bottom. | |
| nest: | code 229 sprayed on entrance block. | ||
| 27-04-2023 | adult: | parent 1 = yX56A | |
| 11-05-2023 | pulli: | 2 chicks ringed, 3rd egg hatching. | |
| 13-05-2023 | adult: | partner 2 is cach. | |
| 18-05-2023 | pulli: | 2 chicks present (R-7Y and unringed one, which is now ringed). | |
| 27-05-2023 | pulli: | 2x ringed birds measured: g-7|U & r-7Y. | |
| 18-06-2023 | adult: | ad yX56A easy at bread. | |
| 25-06-2023 | pulli: | r-78 and g-7|U present. | |