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Coordinator: Albert de Jong Merijn Loeve Roland-Jan Buijs Thijs Horst Leon Kelder Mars Muusse |
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location | April 12th, 2022: nest high on dam 1. | April 12th, 2022: nest high on dam 1. | May 4th, 2022: 3 eggs in nest. |
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April 27 2023: female Caspian & 2x Herring from nest 61. | |||
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partner 1 | May 4th, 2022: Dutch 4CY male hybrid Caspian Gull n-F|N. | May 9th, 2022: male n-F|N trapped on nest. | May 9th, 2022: male n-F|N trapped on nest. |
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partner 1 | April 09 2023: n-F|N. | April 27 2023: Caspian Gull n-F|N. | July 08 2023: Caspian Gull n-F|N. |
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partner 2 | May 4th, 2022: female Caspian Gull cachinnans. | April 12th, 2022: both partners. | . |
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partner 2 | Trapped at nest on May 03 2023: Caspian Gull r-7N. | June 25 2023: Caspian Gull r-7N. | July 08 2023: Caspian Gull r-7N. |
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pullus | May 30th, 2022: pullus r-7.B. | July 12th, 2022: fledged r-7.B. | July 12th, 2022: fledged r-7.B. |
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July 08 2023: fledged juvenile r-8F. | July 15 2023: fledged juvenile r-8J. | . | |
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Visits and data:
Estimation egg laying: A-egg = April 19 2022. Estimating hatching = May 17 2022.
date | |||||||
12-04-2022 | Cachinnans-type n-F|N guarding high on dam 2. | ||||||
01-05-2022 | Cachinnans-type n-F|N walks from nest in small bush, high on dam 2. Below him is nest 061Z. | ||||||
Cachinnans female landed next to n-F|N, and this femaler is ringed on tarsus! (in retrospect: never seen again this bird). | |||||||
04-05-2022 | Two adults at nest. Female cachinnans and 4CY n-F|N. | ||||||
3 eggs | egg no: | width (mm) | length (mm) | volume (cm3): | water test on May 4th: | ||
A egg | 49,9 | 74 | -- | -- | |||
B egg | 47,9 | 68,5 | -- | -- | |||
C egg | 50 | 71 | -- | -- | |||
09-05-2022 | 3 eggs. We trapped n-F|N at the nest. No measurements taken. | ||||||
17-05-2022 | 3 eggs. | ||||||
22-05-2022 | 3 eggs. | ||||||
30-05-2022 | n-F|N at nest. 2 chicks. | ||||||
pullus | metal | darvic | mass | wing | H+B Bill | ||
.5625183 | r-7.B | 87 | 25 | 53,9 18,4 | |||
pullus | 1 pullus dead in nest. | ||||||
02-06-2022 | Cachinnans-type n-F|N defending nest. | ||||||
17-06-2022 | Cachinnans-type n-F|N at nest. | ||||||
21-06-2022 | Nest empty, Chick r-7.B not found in vegetation. | ||||||
12-07-2022 | Photographed r-7.B. | ||||||
In 2022 one chick ringed in this nest: r-7.B. |
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 | nFN & r7N | 0 | 0 | 0,00 | 0 | 0 | 0,00 | 0 | 0 | 0,00 | 0,00 | same as 2022 |
ring pulli: -- | laying A egg: -- | hatch A egg: -- | ||||||||||
catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | bill: | gonys: | greytone: | |||
adult | 03-05-2023 | 6.214.906 | R-7.N | -- | 433 | 123,7 | 52,6 | 18,4 | 6 | female cach | ||
pullus: | 18-05-2023 | 5.556.488 | R-8.F | 256 | -- | 65,4 | -- | -- | -- | |||
pullus: | 18-05-2023 | 5.556.489 | R-8.J | 224 | -- | 70 | -- | -- | -- | |||
pullus: | 27-05-2023 | 5.556.488 | R-8.F | 643 | -- | -- | -- | -- | -- | |||
pullus: | 18-06-2023 | 5.556.489 | r-8.J | 1020 | 341 | 126,8 | -- | -- | -- | with sibling |
n-F|N & r-7.N | |||
dam: | dam 1 west | ||
location: | Is nest n-F|N-2022. Nest 2023 is 3 mtr further N now, closer to Herring Gull w-8Z. | ||
breeders: | cach x cach | ||
OBSERVATIONS: | |||
04-04-2023 | adult: | n-F|N at nest location. | |
09-04-2023 | nest: | no eggs, but nest ready. | |
adult: | Male is n-F|N, female is cach unringed. | ||
27-04-2023 | adult: | Male is n-F|N, female is cach unringed. | |
03-05-2023 | adult: | Trapped unringed female at nest: r-7N. | |
13-05-2023 | adult: | Both parents present. | |
18-05-2023 | pulli: | 2 chicks ringed, 3rd one not found. | |
27-05-2023 | pulli: | 1x control chick. | |
18-06-2023 | pulli: | r-8J & r-8F present. Probably no 3rd chick. Fledged: 2 juveniles. | |
25-06-2023 | pulli: | r-8J & r-8F present. Both parents as well. |