Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse
Cachinnans - nest Lelystad b-F|= (251-2025)
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).
- In 2024: nest 251 positioned on dam 2 west section. 1 mtr N of blue sign VHF20. White detergent container "ARIEL" placed next to nest, Visible only from N side.
- In 2025 breeding birds at nest 251 "Ariel" are Caspian Gulls, of which b-F|=. For data on nest 251 in previous seasons, see HERE.
| nest | April 09 2023: location nest 251. | March 21 2025: 2 eggs in nest "Ariel". | March 21 2025: 2 eggs (is max for 2025). |
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| partner 1 | February 16 2025: b-F|=. | March 25 2025: b-F|=. | March 25 2025: b-F|=. |
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| partner 2 | March 16 2025: b-F|= & partner. | . | . |
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| chicks | June 30 2025: chick G-R|0. Fledged. | . | . |
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Data for nest b-F|= (251-2025 "Ariel").
| 2025 | parent 1 | parent 2 | A_length | A_width | A_volume | B_length | B_width | B_volume |
| b-F|= (Ariel / 251) | cach | cach | 71,4 | 48,9 | 70 | 52,2 | ||
| dam: | dam 2 west
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| location: | 2 m N of blue sign, loaction of 2024, Ariel / white Buoy,
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| parents: | new, now b-F|= and Caspian Gull partner.
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| ring pulli: | ||||||||
| ringed: | darvic | metal | location / nest# | species | sexe | age | wing | mass |
| 31-05-2025 | G-R|0 | 5,641,925
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PONT | pullus | 780 | |||
| 09-06-2025 | G-R|0 | 5,641,925
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CONTROL | PONT | pullus | 931 | ||
| 14-06-2025 | G-R|0 | 5,641,925
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CONTROL | PONT | pullus | 1058 | ||
OBSERVATIONS:
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| 16-03-2025 | nest | 1x cach at blue sign, above nest location,
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| nest | b-F|= and unringed partner at soos dam 2,
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| 20-03 | nest | b-F|= present on VHF sign dam 2
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| 25-03 | nest | b-F|= present on VHF sign dam 2
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| 01-04 | nest | b-F|= present below VHF sign around Ariel nest, but 2 more cachs present
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| 21-04 | nest | 2 eggs, measured,
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| 28-04 | nest | 2 eggs | ||||||
| 08-05 | adult | b-f|= present
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| 13-05 | nest | empty nest, no chicks found
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| 31-05 | chicks | g-R|0 caught on water, with X60J alarming above. Ringed & measured. Chick appeared to belong to b-F|= | ||||||
| 09-06 | chicks | g-R|0 at water again, near nest b-F|=, CONTROL measure. | ||||||
| 14-06 | chicks | g-R|0 at water again, near nest b-F|=, CONTROL measure. | ||||||