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
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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|Z 1CY, June - October 2023, the Netherlands. Picture: Hans van Muiswinkel, Nel Bekema, Thijs Horst & Mars Muusse.

Tibia ring G-8|Z and metal NLA 5.625.270, ringed as pullus Larus cachinnans on May 27 2023 in nest 112 at Lelystad, the Netherlands. Ringed by Merijn Loeve / Roland-Jan Buijs ringing team.

Recoveries:
09-08-2023 Bunschoten-Spakenburg (Visverwerker), Utrecht, NL 5.215,00 N 523,00 E colourring read Hans van Muiswinkel
15-09-2023 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Jaap van der Linden
20-09-2023 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
10-10-2023 Bunschoten (Strand), Utrecht, NL 5.215,00 N 522,00 E colourring read Nel Bekema
10-10-2023 Bunschoten-Spakenburg (Visverwerker), Utrecht, NL 5.215,00 N 523,00 E colourring read Hans van Muiswinkel
13-10-2023 Bunschoten-Spakenburg (Visverwerker), Utrecht, NL 5.215,00 N 523,00 E colourring read Hans van Muiswinkel
31-10-2023 Bunschoten-Spakenburg (Visverwerker), Utrecht, NL 5.215,00 N 523,00 E colourring read Hans van Muiswinkel

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 112-2023 74,6 51,7 100,40 74,2 51 97,17 71,2 50,2 90,34 287,91 same as 2022
ring pulli: May 09. laying A egg: April 06. hatch A egg: May 04.
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 18-5-2023 5.556.407 G-7|R 123 59,6
Pullus 18-5-2023 5.556.408 G-7|S 84 53
Pullus 27-5-2023 5.556.407 g-7|R 382
Pullus 27-5-2023 5.625.270 g-8|Z 538
Pullus 18-6-2023 5.556.408 g-7|S
 
112-2023
dam: dam 1 east
location: Top of dam. On S-side: red/white traffic sign, nest 112 is just east of it. Same nest as 112-2022
breeders: cach x cach
OBSERVATIONS:
09-04-2023 adult: Unringed cach present at location. So search for nest today.
26-04-2023 adult: Unringed cach present at location.
nest: Almost within Elder (vliertje), old red spot visible. Yellow/black flag in Elder. Top of dam, 25 m W of 19.
eggs: 3x egg, measured. A 90 - tip bottom
B 90 - tip bottom
C 80 - tip bottom
11-05-2023 eggs: 3 eggs
13-05-2023 adult: female = cach thayeri. Male is cach.
18-05-2023 pulli: 2 chicks ringed, 3rd not found.
27-05-2023 pulli: 3rd chick ringed today, near waterfront at S-side.
18-06-2023 pulli: g-7|S at waterfront.
25-06-2023 adult: thayeri and all 3 chicks present. 3x fledged.

below: Caspian Gull cachinnans 8|Z 1CY, October 31 2023, Bunschoten-Spakenburg, the Netherlands. Picture: Hans van Muiswinkel.

below: Caspian Gull cachinnans 8|Z 1CY, October 13 2023, Bunschoten-Spakenburg, the Netherlands. Picture: Hans van Muiswinkel.

below: Caspian Gull cachinnans 8|Z 1CY, October 10 2023, Bunschoten-Spakenburg, the Netherlands. Picture: Hans van Muiswinkel.

below: Caspian Gull cachinnans 8|Z 1CY, October 10 2023, Bunschoten, the Netherlands. Picture: Nel Bekema.

below: Caspian Gull cachinnans 8|Z 1CY, July 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8|Z 1CY, July 15 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8|Z 1CY, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 8|Z 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

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

Finally, 3rd chick of this nest ringed today.