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 8.8 1CY, May - August 2023, England & the Netherlands. Picture: Andrew Chick, Thijs Horst & Mars Muusse.

Tibia ring R-88 and metal NLA 5.556.484, ringed as pullus Larus cachinnans on May 11 2023 in nest 053 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.

Recoveries:
23-8-2023 Spurn (Kilnsea Wetlands), East Yorkshire, ENGELAND 5.337,00 N 7,00 E colourring read Andrew Chick
23-8-2023 Spurn (Kilnsea Wetlands), East Yorkshire, ENGELAND 5.337,00 N 7,00 E colourring read David Saleh
23-8-2023 Spurn (Kilnsea Wetlands), East Yorkshire, ENGELAND 5.337,00 N 7,00 E colourring read Paul Collins

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 53-2023 73,4 48,7 87,65 68,6 48,5 81,25 68,3 47,7 78,25 247,14 same as 2022
ring pulli: -- laying A egg: -- hatch A egg: --
 
catch: date: metal: darvic: mass: head+bill:
Pullus 11-5-2023 5.556.483 r-87 Nest low N-side blocks. With 2 Caspian parents.
Pullus 11-5-2023 5.556.484 r-88 Nest low N-side blocks. With 2 Caspian parents.
Pullus 18-5-2023 5.556.483 r-87 blocks W-side.
Pullus 27-5-2023 5.556.483 r-87 434 blocks W-side, on north.
Pullus 27-5-2023 5.556.484 r-88 584 blocks W-side, on north.
Pullus 18-6-2023 5.556.484 r-88 blocks W-side, on north.
 
53-2023 / 163-2023 (likely 2 nests, but maybe all data for 1 pair only).
dam: dam 1 blocks
location: is nest 53/110, same as 2021/2022. Later in season chicks ringed little north of this spot, but then no Caspians higher on dam. Same couple?
breeders: cach x cach
OBSERVATIONS:
26-4-2023 nest: Refreshed red stripe on block, nest is 1,5 m south of red stripe.
eggs: 3x egg, measured. No water test.
11-5-2023 nest: 1 egg hatching, other 2 still complete, but many nests here. If this is the wrong nest, then maybe R-87 & R-88 from nest 163? In retrospect: yes, likely of 163.
18-5-2023 nest: Empty, no chicks found.
27-5-2023 nest: No shit at nest, no traces of chicks. Low on N-side, found again R-87 & R-88 from new nest number 163 (and likely not from 53)?
18-6-2023 pull: R-88 might be hybrid? See nest 163 (which is north of 53), for details on R-8.7 and R-8.8. Present on N-side, but walks up to location nest 53!

below: Caspian Gull cachinnans 8.8 1CY, August 23 2023, Kilnsea Wetlands, England. Picture: Andrew Chick.

below: Caspian Gull cachinnans 8.8 1CY, July 15 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.8 1CY, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.8 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.8 1CY, June 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8.8 1CY, May 11 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.