Larus cachinnans in the Netherlands

(last update: August 16, 2020)
Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse

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Nests at Lelystad 2022
nest y-PNED
nest y-PHSV / r-CG
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X540
nest y-XCHP
nest w-327:U
nest n-F|N
nest r-6A
nest r-6B
nest r-6C
nest r-CS
nest r-FC
nest w-8Z
nest zy-MT
nest 003
nest 011
nest 012
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 058
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 109
nest 111
nest 112
nest 113
nest 117Z
nest 118Z
nest 123Z
nest 124Z
nest 125Z
nest 126Z
nest 127Z
nest 128Z
nest 129Z
nest 131Z
nest 132 YLG
nest 133
nest 134
nest 135
nest 136
nest 137
nest 138
nest 139
nest 143Z
nest 203
nest 204
nest 207
nest 222Z
nest 227
nest 228Z
nest 229
nest 230Z
nest 231
nest 240Z
nest 244
nest 245Z

Caspian Gull cachinnans 6.V 1CY-3CY, May 2022 - April 2024, the Netherlands & England. Picture: Rob Creek, Thijs Horst & Mars Muusse.

Red tibia ring r[6.V] and metal NLA 5.625.133, ringed as pullus Larus cachinnans hybrid at nest X540 on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Albert de Jong - Roland-Jan Buijs ringing team.
ID certain in 2022: one parent is adult cachinnans, other parent is German 5CY y[X540] which may have a bit of argentatus blood.

Recoveries:
18-10-2022 Manchester (vuiloverslag), Greater-Manchester, ENGELAND 5.327,00 N 212,00 W colourring read Rob Creek
30-07-2023 Neder-over-Heembeek (Vuiloverslag), Brussel, BELGIE 5.053,00 N 422,00 E colourring read Maurice Segers & Michel Janssens
17-09-2023 Neder-over-Heembeek (Vuiloverslag), Brussel, BELGIE 5.053,00 N 422,00 E colourring read Maurice Segers
12-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read M. Loeve & M. Muusse

Data for nest X540-2022:

date            
19-04-2022 behind nest 17, landing Caspian Gull and Caspian (hybrid?) y-X540. Best viewed from north side.
29-04-2022 3 eggs egg no: width (mm) length (mm) volume (cm3):  water test on April 29th: 
    A egg 49,8 72,5 -- 50 - tip on bottom
    B egg 48,3 71,4 -- 90 - tip on bottom
    C egg 48,8 71,6 -- 65 - tip on bottom
04-05-2022 2 adults at nest, including y-X540.
09-05-2022 3 eggs.
17-05-2022 2 eggs and 1 chick. B egg and C egg are hatching.
  pullus ringed with metal NLA .5625133
30-05-2022 2 chicks metal darvic Mass Wing Head+Bill Bill
    .5625172 r-6U 421 70 79,1 33,7
    .5625133 r-6V 410 84 78,5 28,2
  3rd chick is dead in the nest.
02-06-2022 adult y-X540 present and aggressive.
17-06-2022 3 ringed chicks are standing in nest 17, club of nest 17 together with nets 223 most likely.
21-06-2022 both parents present.
28-06-2022 adult y-X540 present.
12-07-2022 adult male present with chick r-6.U.
17-07-2022 adult male present with both chicks r-6.U & r-6.V.

below: Caspian Gull cachinnans 6.V 3CY, April 12 2024, colony Lelystad, the Netherlands. Picture: Merijn loeve & Mars Muusse.

below: Caspian Gull cachinnans 6.V 1CY, October 18 2022, Manchester, England. Picture: Rob Creek.

below: Caspian Gull cachinnans 6.V 1CY, July 17 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 6.V 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[6.V] cachinnans from nest 223 y[X540]. Picture: May 30th, 2022.
Ringed on May 30th. Last positive ring reading from that date. Same for sibling r[6.U].
However, June 17th, several ringed chicks present in neighbor nest 17, likely including chicks from nest 223.