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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Breeding biology
Fecundity
Food resources
Nonbreeding season
Breeding species
Hybrid scores
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Future

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 8.K 1CY, May - June 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Tibia ring R-8.K and metal NLA 5.556.468, ringed as pullus Larus cachinnans on May 18 2023 in nest 038 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 hybrid 38-2023 69 50 86,85 68,6 52 93,40 67,8 51,9 91,95 272,20 same as 2022
ring pulli: 14-mei laying A egg: 11-apr hatch A egg: 9-mei
     
catch: date: metal: darvic: mass: wing: head+bill:      
Pullus 11-5-2023 NLA 5.556.468 R-8.K (on 18-5) 235 (on 18-5) 67
Pullus 18-5-2023 NLA 5.556.421 G-7|2 152 59,8
Pullus 18-6-2023 NLA 5.556.468 R-8.K 1077 328 122,4
Pullus 18-6-2023 NLA 5.556.421 G-7|2 887 311 112,7
 
38-2023
dam: dam 2 east of T-split
location: 2 large boulders, west one is lookout post, 200 mtr E of T-split, on top of tarmac. Red flag at N-side between blocks.
breeders: cach x river gull
OBSERVATIONS:
09-4-2023 2 adults cach type & river gull type on lookout. No eggs, but nest is ready.
26-4-2023 eggs: 3x egg, measured. Water test: A: floating - halfway
B: 80 - tip bottom
C: floating - 1mm
11-5-2023 pulli: 1 chick ringed, 1 egg hatching, 3rd egg still complete.
18-5-2023 pulli: 2 chicks present (R-8K and unringed one, which is now ringed) 1 rotten egg.
18-6-2023 pulli: 2x fledged from nest (1x rotten egg).
25-6-2023 pulli: r-8K present.

below: Caspian Gull cachinnans 8.K 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.K 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.