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 hybrid(?) 7.L adult, May 03 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Red tibia ring r[7.L] and metal NLA 6.214.904, ringed as breeding adult male Larus cachinnans-type at nest 62 on May 03 2023 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.

Recoveries:
21-07-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
26-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E captured by ringer Mars Muusse
30-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
02-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
05-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
13-07-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland

ID uncertain for nest 62. Difficult to monitor exact relations in this cluster of nests.

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 ? 62-2023 70,1 51,2 92,52 70,3 51,8 94,98 67,9 51,7 91,38 278,88 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 6214904 r-7.L nn 466 136 59,7 21,6 6 male cach
pullus 18-05-2023 5556422 G-7|3 116 52,6
 
62-2023
dam: dam 1 west
location: Is nest 62-2021/22. From cluster 60-62-63.
breeders: cach x ?
OBSERVATIONS:
09-04-2023 nest: no eggs, nest is ready.
22-04-2023 nest: 3 eggs, water test = tip bottom 90 degrees; tip bottom 50 degrees, tip bottom 45 degrees.
03-05-2023 adult: trapped male cach-type: r-7.L.
eggs: 3 eggs.
18-05-2023 eggs: 1 rotten egg.
  pullus: 1 chick ringed is G-7|3, 1 chick dead in nest.

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-7L / 62 cach cach r-7L 71 50,9 92,62 67,6 52 92,03 66,5 50,3 84,71
269,37
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 10-4-2024 7-5-2024
   
dam: dam 1 south
location: Is nest 62-2021/2023. r-7L again at spot 62, same as 2023.
parents? same as 2020-23.
   
ring pulli: 11-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
26-4-2024 r-7L .6214904 nest 62 dam 1 PONT M >4CY 461 1234 136,7 59,0 74,5 19,0 7
                           
OBSERVATIONS:
12-4-2024 eggs: 2 eggs, measured.
21-4-2024 eggs: 3 eggs, measured.
nest: cluster again: 60, 69, PAM0, n-F|+, and 2 Herrings to follow soon.
26-4-2024 adults: CONTROL: trapped male, rings not replaced, remains r-7L
   
   
   

below: Caspian Gull cachinnans hybrid(?) 7.L adult, May 03 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Note: limited black on P5, and quite some black on innerweb of P10.

below: Caspian Gull cachinnans hybrid(?) 7.L adult, May 03 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Note: short and high bill, limited black on P5, and quite some black on innerweb of P10.