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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Nests at Lelystad 2023
nest y-PNED
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X60J
nest y-XCHP
nest w-327:U
nest n-F|6
nest n-F|8
nest n-F|+
nest n-F|N
nest r-6B
nest r-CG
nest w-8Z
nest 003
nest 006
nest 013
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 033
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 108
nest 109
nest 111
nest 112
nest 127Z
nest 131Z
nest 132 YLG
nest 135
nest 139
nest 147Z
nest 154
nest 163
nest 167
nest 168
nest 204
nest 206
nest 207
nest 223
nest 227
nest 230Z
nest 231
nest 244Z
nest 245Z
nest 248
nest 251
nest 252
nest 253
nest 254
nest 255Z
nest 256Z
nest 262

 

Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|P 1CY, May 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia ring G-8|P and metal NLA 5.625.264, ringed as pullus Larus cachinnans hybrid on May 18 2023 in nest 048 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 teus 48-2023 73,2 48,5 86,69 72,4 48,2 84,69 67,5 48,4 79,61 251,00 same as 2022
ring pulli: 20-mei laying A egg: 15-apr hatch A egg: 13-mei
     
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 27-5-2023 5.625.264 G-8|P 394 -- -- is nest 15B, full throat pouch with fish.
Pullus 27-5-2023 5.625.281 G-8|R 435 -- -- is nest 15B
Pullus 18-6-2023 5.625.281 G-8|R 918 301 113,0 hybrid type
   
48-2023 was 15B
dam: dam 2 central
location: Next to prunus, 1 mtr E of code 44 on blocks. 4 mtr from waterfront.
breeders: cach x teus
OBSERVATIONS:
09-4-2023 nest: no eggs, nest is ready.
26-4-2023 nest: 3 eggs measured, and water test: A: 80 - tip bottom
B: 80 - tip bottom
27-4-2023 adult: cach & teus, cach breeding. C: 90 - tip bottom
cach with patterns on P4.
11-5-2023 eggs floating - 5 mm.
27-5-2023 pulli: 2x chicks ringed and measured.
18-6-2023 pulli: 1x control of g-8|R, which is hybrid type. Fledged: 1x juvenile.
25-6-2023 pulli: G-8|R present.

below: Caspian Gull cachinnans x Herring Gull argenteus hybrid 8|P 1CY, May 27 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.