Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
Argenteus - nest Lelystad r-6.B (120Z)
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 r-6.B positioned on breakwater dam 1 south, small bush at edge of tarmac, 25 meters east of nest 117.
- ID certain in 2022: both parents are adult Herring Gull argenteus, one of the parents trapped as breeder in 2022 and ringed r[6.B].
- In 2023: recorded in the colony 3 times (April, June & July), feeding at bread near dam 2. No indication for nesting.
- In 2024: Herring Gull r-6B and 5CY Herring Gull.
| location | April 27th, 2022: nest. | May 4th, 2022: code for nest. | May 4th, 2022: Herring Gull. |
 |
 |
 |
|
| nest | April 27th, 2022: 1 egg in nest. | May 4th, 2022: 3 eggs in nest. | May 9th, 2022: 3 eggs in nest. |
 |
 |
 |
|
| partner 1 | May 22nd, 2022: Herring Gull r-6.B. | May 22nd, 2022: Herring Gull r-6.B. | July 12th, 2022: Herring Gull r-6.B. |
 |
 |
 |
|
| partner 1 | May 17th, 2024: Herring Gull r-6.B. | . | . |
 |
|||
| partner 2 | May 14th, 2024: Herring partner 5CY. | May 14th, 2024: Herring partner 5CY. | May 14th, 2024: Herring partner 5CY. |
 |
 |
 |
|
| pullus | June 18 2024: Herring Gull chick b/w-A=. | . | . |
 |
Visits and data:
Estimation egg laying: A-egg = April 26 2022. Estimating hatching = May 24 2022.
| date | |||||||
| 27-04-2022 | 1 egg | egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 27th: | |
| A egg | 48,9 | 79,2 | -- | 0 - flat bottom | |||
| 04-05-2022 | code '120' sprayed on tarmac. Herring Gull at nest. | ||||||
| 3 eggs | egg no: | width (mm) | length (mm) | volume (cm3): | water test: | ||
| A egg | 48,7 | 79,3 | -- | -- | |||
| B egg | 45,8 | 71 | -- | -- | |||
| C egg | 48,6 | 74,5 | -- | -- | |||
| 09-05-2022 | 3 eggs. | ||||||
| 17-05-2022 | 3 eggs. | ||||||
| 22-05-2022 | 3 eggs. Adult Herring Gull trapped at the nest, bird was already metal ringed, pullus 2015 Texel. | ||||||
| metal: | darvic: | wing: | Head + Bill: | Gonys: | Mass: | Greytone: | |
| NLA 5507416 | r-6.B | 417 | 118,9 | 18,6 | 897 | 5.0 | |
| 30-05-2022 | No chicks found. | ||||||
| 12-07-2022 | r-6B photographed. | ||||||
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: | |
| r-6B (264) | teus | teus type | 75,6 | 48,5 | 89,54 | 75,4 | 48,4 | 88,93 | 0,00 | 178,47 | |||
| 2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 2 | 04-5-2024 | 02-6-2024 | |||||||||||
| dam: | dam 2 central | ||||||||||||
| location: | next to nest Blue Foam | ||||||||||||
| parents? | Same as 2023? | ||||||||||||
| ring pulli: | 6 June | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| 04-06-2024 | .5631002 | Blauwe schuim | Zilver | 1CY | 82 | ||||||||
| 18-06-2024 | b/w-A= | .5631002 | nest r-6B | Zilver | 1CY | 108 | 634 | 87,6 | |||||
| OBSERVATIONS: | |||||||||||||
| 21-04-2024 | nest: | empty | |||||||||||
| 07-05-2024 | eggs: | 2 eggs, measured. | |||||||||||
| 14-05-2024 | eggs: | 3x, C-egg still to measure. | |||||||||||
| adult: | Herring Gull 5CY at nest. | ||||||||||||
| 17-05-2024 | adult: | Herring Gull r-6B. | |||||||||||
| 04-06-2024 | chicks: | 1x ringed. | |||||||||||
| adult: | 1x present. | ||||||||||||
| 18-06-2024 | chick: | CONTROLL: 5631002 metal ring moved to tarsus, and tibia ringes added today. | |||||||||||