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

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Caspian Gull cachinnans 8.7 1CY, May - July 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia ring R-87 and metal NLA 5.556.483, ringed as pullus Larus cachinnans on May 11 2023 in nest 053 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.

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 53-2023 73,4 48,7 87,65 68,6 48,5 81,25 68,3 47,7 78,25 247,14 same as 2022
ring pulli: -- laying A egg: -- hatch A egg: --
 
catch: date: metal: darvic: mass: head+bill:
Pullus 11-5-2023 5.556.483 r-87 Nest low N-side blocks. With 2 Caspian parents.
Pullus 11-5-2023 5.556.484 r-88 Nest low N-side blocks. With 2 Caspian parents.
Pullus 18-5-2023 5.556.483 r-87 blocks W-side.
Pullus 27-5-2023 5.556.483 r-87 434 blocks W-side, on north.
Pullus 27-5-2023 5.556.484 r-88 584 blocks W-side, on north.
Pullus 18-6-2023 5.556.484 r-88 blocks W-side, on north.
 
53-2023 / 163-2023 (likely 2 nests, but maybe all data for 1 pair only).
dam: dam 1 blocks
location: is nest 53/110, same as 2021/2022. Later in season chicks ringed little north of this spot, but then no Caspians higher on dam. Same couple?
breeders: cach x cach
OBSERVATIONS:
26-4-2023 nest: Refreshed red stripe on block, nest is 1,5 m south of red stripe.
eggs: 3x egg, measured. No water test.
11-5-2023 nest: 1 egg hatching, other 2 still complete, but many nests here. If this is the wrong nest, then maybe R-87 & R-88 from nest 163? In retrospect: yes, likely of 163.
18-5-2023 nest: Empty, no chicks found.
27-5-2023 nest: No shit at nest, no traces of chicks. Low on N-side, found again R-87 & R-88 from new nest number 163 (and likely not from 53)?
18-6-2023 pull: R-88 might be hybrid? See nest 163 (which is north of 53), for details on R-8.7 and R-8.8. Present on N-side, but walks up to location nest 53!

below: Caspian Gull cachinnans 8.7 1CY, July 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Officially fledged (on age), but a weak bird.

below: Caspian Gull cachinnans 8.7 1CY, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.7 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.7 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans 8.7 1CY, May 11 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.