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 7.U 1CY-2CY, May 2023 - March 2024, Lelystad & Almere, the Netherlands. Picture: Eric Roeland, Thijs Horst & Mars Muusse.

Tibia R-7U and metal NLA 5.625.193, ringed as pullus Larus cachinnans on May 11 2023 in nest 251 at colony Lelystad, the Netherlands (5230.00 N 525.00 E). Ringer Roland-Jan Buijs.

Recoveries:
11-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
18-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
27-05-2023 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
26-06-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
15-07-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
07-10-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
13-10-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
30-10-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
04-11-2023 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
29-11-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
01-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
12-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
16-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
18-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 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 251-2023 70,7 50 88,99 68,1 51,4 90,59 67,7 49,1 82,18 261,76 was 12-2022???
ring pulli: May 10 laying A egg: April 05 hatch A egg: May 03
     
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 11-5-2023 5.625.193 r-7.U 315 75.0 75.0 two other chicks? Chicks not found
Pullus 18-5-2023 5.556.411 g-7|V 490 86,3 86,3
Pullus 18-5-2023 5.625.193 r-7U not measured, but was present.
Pullus 27-5-2023 5.625.193 r-7U 896
Pullus 18-6-2023 5.625.193 r-7U
Pullus 18-6-2023 5.556.411 g-7|V
   
251-2023 nest "White Buoy".
dam: dam 2 west
location: 1 mtr N blue sign VHF20, 2 mtr behind of white buoy. Could be parents nest 12-2020/2022. parents guarding from VHF20?
breeders: cach x cach
OBSERVATIONS:
9-4-2023 nest: 3 eggs measured. Watertest C-egg: 35 - tip bottom
27-4-2023 adult: breeding adult cach.
11-5-2023 pulli: 1 chick ringed, 2 more chicks?
18-5-2023 pulli: 2 chicks present. 1 ringed (R-7U), other unringed. The unringed one is now ringed today g-7|V
27-5-2023 pulli: 1x chick measured.
18-6-2023 pulli: g-7|V and r-7U together.
25-6-2023 pulli: G-7|V and r-7U together: 2 chicks fledged from this nest.

below: Caspian Gull cachinnans 7.U 2CY, March 30 2024, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans 7.U 2CY, January 18 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.U 2CY, January 16 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.U 2CY, January 12 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.U 1CY, December 01 2023, Almere - De Vaart, the Netherlands. Picture Mars Muusse.

One parent is definitely Caspian Gull, the other is unknow, but Herring blood may be involved in this nest. Note:
- head still streaked densely, head shape rather rounded to angular, not pear-shaped as in most Caspians,
- dark underwing coverts,
- vermiculated fringes on tertials,
- Herring-like pattern on greater coverts.

In sibling g-7|V, note the extensive pale window on the inner primaries.

below: Caspian Gull cachinnans 7.U 1CY, November 29 2023, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans 7.U 1CY, November 12 2023, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans 7.U 1CY, October 31 2023, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans 7.U 1CY, October 07 2023, Almere - De Vaart, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans 7.U 1CY, July 15 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.U 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.U 1CY, June 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.U 1CY, May 27 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans 7.U 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans 7.U 1CY, May 11 2023, Lelystad colony, the Netherlands. Picture: Albert de Jong.

Ringed in nest 251.