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 222
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 222 positioned high on breakwater dam 2 at the north side, 8 meters east of nest 17.
- ID uncertain in 2022, female is argenteus, male is hybrid type (rich yellow legs, red orbital, bulbuous bill, pale iris, broad band P5, broad medial band on P10, darker grey deck).
- In 2023: nest not used.
- In 2024: uncertain.
| location | May 1st, 2022: nest (view from north). | April 29th, 2022: 2 eggs. | April 29th, 2022: 2 eggs. |
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| location | April 21st, 2024: 1 egg. | April 23rd, 2024: both are Caspian Gull. | . |
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| partner 1 | May 1st, 2022: female argenteus. | May 4th, 2022: female argenteus. | May 4th, 2022: female argenteus. |
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| partner 1 | April 23rd, 2024: female Caspian Gull. | April 23rd, 2024: female Caspian Gull. | April 23rd, 2024: female Caspian Gull. |
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| partner 2 | May 4th, 2022: male is hybrid "river gull". | May 4th, 2022: male is hybrid "river gull". | May 4th, 2022: male is hybrid "river gull". |
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| partner 2 | April 23rd, 2024: male Caspian Gull. | April 23rd, 2024: male Caspian Gull. | April 23rd, 2024: male Caspian Gull. |
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Visits and data 2022.
| date | ||||||
| 29-04-2022 | 2 eggs | egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 29th: |
| A | 73,8 | 51,6 | -- | 15 - flat on bottom | ||
| B | 73,1 | 52,7 | -- | 10 - flat on bottom | ||
| 01-05-2022 | 2 birds at nest, male 'river gull' hybrid type (rich yellow legs, red orbital, bulbuous bill, pale iris, broad band P5, broad medial band on P10). Female is Herring Gull. | |||||
| 04-05-2022 | 2 birds at nest. Female breeds. | |||||
| 09-05-2022 | 3 eggs. | |||||
Visits and data 2024
| NEST code | parent 1 | parent 2 | A_length | A_width | A_volume | B_length | B_width | B_volume | C_length | C_width | C_volume | TOTAL NEST: | |
| 69,5 | 50 | 87,48 | 0,00 | 0,00 | 87,48 | ||||||||
| 222-2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 21-4-2024 | 19-5-2024 | ||||||||||||
| dam: | dam 2 central | ||||||||||||
| location: | 222-2022, behind Elderberry, 3 mtr east of 17 | ||||||||||||
| parents? | Same as 2022? was River Gull x Herring Gull in 2022. Nest not used in 2023. | ||||||||||||
| ring pulli: | 25-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| OBSERVATIONS: | |||||||||||||
| 21-04-2024 | eggs: | 1 egg, measured. | |||||||||||
| 07-05-2024 | nest: | 3 eggs. | |||||||||||
| 14-05-2024 | nest: | 3 eggs. | |||||||||||
| 31-05-2024 | nest: | broken eggs around nest. Predation? | |||||||||||
| 04-06-2024 | nest: | seems abandoned, failed season 2024. | |||||||||||