Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse

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Caspian Gull cachinnans F.7 adult, May 2023 - April 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Red tibia ring r[F.7] and metal NLA 6.214.901, ringed as breeding female Larus cachinnans at nest 60 on May 03 2023 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID certain for nest 60, both parents are Caspian Gull cachinnans. Female parent is ringed r-F7 in 2023.

Recoveries:
03-05-2023 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
08-07-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
26-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
31-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
08-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse

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 60-2023 68,2 51 89,31 69,9 51 91,54 66,2 50,2 84,00 264,85 same as 2022
ring pulli: 11-mei laying A egg: 6-apr hatch A egg: 4-mei
     
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone: tarsus kor:
adult 03-5-2023 NLA 6214901 R-F.7 810? 447 125,6 57,5 18 6 female cach
pullus 11-5-2023 NLA 5556469 R-8.=
pullus 11-5-2023 NLA 5556470 R-8.T
pullus 11-5-2023 NLA 5556471 R-8.C
pullus 27-5-2023 NLA 5556469 R-8.= 872 109,3 45,8 14 72,8
 
60-2023
dam: dam 1 west
location: Is nest 60-2021/22. From cluster 60-62-63.
breeders: cach x cach
OBSERVATIONS:
09-04-2023 nest: 2 eggs measured. No watertest, ring chicks in 1st session.
22-04-2023 nest: 3 eggs measured.
03-05-2023 adult: Female partner ringed R-F.7.
11-05-2023 pulli: 3 chicks ringed.
13-05-2023 adult: both parents are cach.
18-05-2023 pulli: 3 chicks present.
27-05-2023 pulli: 1x control chick.
18-06-2023 adult: R-F7 guarding juveniles.
pulli: R-8= & R-8C present at water. At least 2x fledged.
25-06-2023 pulli: R-8=, R-8C and R-F7 (mother) present.

below: Caspian Gull cachinnans F.6 adult, April 27 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
26-4-2024 r-F7 .6214901 nest r-F7 (69) PONT F >4CY 439 933 125,0 58,0 68,0 21,4 6

below: Caspian Gull cachinnans F.7 adult, March 31 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Below is the partner of n-F7, a male Caspian Gull.

below: Caspian Gull cachinnans F.7 adult, March 26 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans F.7 adult, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans F.7 adult, June 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans F.7 adult, May 03 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.