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 7|T 1CY-3CY, May 2023 - April 2025, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia ring G-7|T and metal NLA 5.556.409, ringed as pullus Larus cachinnans on May 18 2023 in nest 111 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.

Recoveries:
18-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
27-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
18-06-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
18-07-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
16-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
28-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
05-08-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst, M. Muusse & T. Muusse
10-03-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Mars Muusse
25-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
08-04-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse

Data for 2023 nest 111:

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 111-2023 70,7 51,5 94,41 70,5 52,6 98,21 69,7 50,1 88,09 280,71 same as 2022
ring pulli: May 15. laying A egg: April 12. hatch A egg: May 10.
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 18-5-2023 5.556.409 g-7|T 77 52,5
Pullus 27-5-2023 5.556.409 g-7|T 326
Pullus 27-5-2023 5.625.266 g-8|V 253
Pullus 27-5-2023 5.625.269 g-8|X 326
Pullus 18-6-2023 5.625.269 g-8|X fledged
Pullus 18-6-2023 5.625.266 g-8|V 810 262 109,1
Pullus 18-6-2023 5.556.409 g-7|T 809 264 117,1
Pullus 25-6-2023 5.625.269 g-8|X 938 290 117,2
 
111-2023
dam: dam 1 east
location: Top of dam. On S-side: red/white traffic sign, nest 111 is just west of it. Same nest as 111-2022
breeders: cach x cach
OBSERVATIONS:
09-04-2023 adult: Unringed cach present at location. So search for nest today.
26-04-2023 adult: Unringed cach present at location.
nest: Blue jerrycan, old red spot visible. Code 111 sprayed on block N. 10 m W of 112. LBBG 6 m N of 111
eggs: 3x egg, measured. A 60 - tip bottom
B 60 - tip bottom
C 40 - tip bottom
11-05-2023 eggs: 3 eggs
18-05-2023 pulli 1 chick ringed, 1 chick just hatched (still wet), 1 egg
27-05-2023 pulli 3x chicks measured & ringed.
18-06-2023 pulli 3x chicks fledged: g-7|T, g-8|V, g-8|X. 
25-06-2023 pulli g-8|X and g-8|V present

below: Caspian Gull cachinnans 7|T 3CY, April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|T 3CY, March 25 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|T 2CY, July 28 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|T 1CY, July 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|T 1CY, June 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|T 1CY, May 27 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

 

below: Caspian Gull cachinnans 7|T 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.