Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse
Cachinnans - nest Lelystad y-P:9R0
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 PAM0 positioned at breakwater 1, in bend on N-side, in blackberry complex. 135-2023 coded on block. Was thayeri 2022.
- ID certain in 2024, female Caspian Gull cachinnans & male is 5CY Caspian Gull y[P:9R0].
- 2025: present in March-April at Lelystad, but then moved to marker Wadden.
| nest | April 21st, 2024: 3 eggs clutch. | April 23rd, 2024: nest P9R0. | . |
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| partner 1 | March 08 2024: Caspian Gull y[P:9R0]. | March 08 2024: Caspian Gull y[P:9R0]. | April 08 2024: Caspian Gull y[P:9R0]. |
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| partner 1 | April 23rd, 2024: male Caspian Gull y[P:9R0]. | April 23rd, 2024: male Caspian Gull y[P:9R0]. | . |
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| partner 2 | April 23rd, 2024: female partner P9R0. | April 23rd, 2024: female partner P9R0. | April 23rd, 2024: female partner P9R0. |
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| pullus | May 14th, 2024: pullus g-C|E. | May 14th, 2024: pullus g-C|F. | . |
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| food | May 14th, 2024: fish around nest. | . | . |
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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: | |
| P:9R0 2024 | cach | cach | 67,4 | 51,2 | 88,96 | 69 | 49,5 | 85,13 | 69 | 48,2 | 80,71 | 254,80 | |
| # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | |||||||
| 3 | 11-4-2024 | 6-5-2024 | |||||||||||
| dam: | dam 1 east | ||||||||||||
| location: | In bend on N-side, in blackberry complex. 135-2023 coded on block. Was thayeri 2022. | ||||||||||||
| parents? | y-P:9R0 is new breeder. | ||||||||||||
| ring pulli: | 09-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| 14-05-2024 | g-C|E | .5631102 | nest P9R0 | PONT | 1CY | 98 | |||||||
| 14-05-2024 | g-C|F | .5631103 | nest P9R0 | PONT | 1CY | 101 | |||||||
| OBSERVATIONS: | |||||||||||||
| 08-03-2024 | adult: | P9R0 on bread. | |||||||||||
| 12-04-2024 | eggs: | 1 egg, measured. | |||||||||||
| 21-04-2024 | eggs: | 3 eggs, measured. | |||||||||||
| 23-04-2024 | adults: | unringed female incubating, y-P:9R0 guarding on stone. | |||||||||||
| 02-05-2024 | adults: | P9R0 guarding, female incubating. | |||||||||||
| 14-05-2024 | chicks: | 2x ringed. Fish bolus when processed. | |||||||||||
| food: | Fish. 3x Roach, 1x Perch, 2x Round Goby. | ||||||||||||
| eggs: | 1x in nest. | ||||||||||||
| 04-06-2024 | pullus: | g-C|F dead. Rings removed. No sign of g-C|E. Nest failed? | |||||||||||
| adult: | y-P:9R0 present, interested in bread. | ||||||||||||
Visits and data 2025.
| NEST code | parent 1 | parent 2 | A_length | A_width | A_volume | B_length | B_width | B_volume | C_length | C_width | C_volume |
| y-P:9R0 | |||||||||||
| dam: | dam 1 east
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| location: | In bend on N-side, in blackberry complex, 135-2023 coded on block, Was thayeri 2022,
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| ouders: | |||||||||||
| ring pulli: | |||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus |
OBSERVATIONS:
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| 3/16/2025 | nest | P9R0 present with partner, location is 2024, north dam 1, east of blocks,
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| 3/20/2025 | nest | P9R0 present with partner
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| 4/23/2025 | nest | no birds present for over several weeks now,
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| 4/28/2025 | nest | moved to Marker Wadden (Maarten Hotting, pers comm),
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