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 7.B 1CY-2CY, May 2022 - July 2023, the Netherlands & France. Picture: Maarten Hotting, Thijs Horst, Mars Muusse & Geoffroy Chabot.

Red tibia ring r[7.B] and metal NLA 5.625.183, ringed as pullus Larus cachinnans at nest n[F|N] on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs/Albert de Jong.

Recoveries:
15-08-2022 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Willem van der Waal
15-01-2023 Tarnos (Haven), Landes, FRANKRIJK 4.331,00 N 130,00 W colourring read Geoffroy Chabot
27-04-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
19-06-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
25-06-2023 Markermeer (Marker Wadden), Flevoland, NL 5.235,00 N 522,00 E colourring read Maarten Hotting
14-07-2023 Markermeer (Marker Wadden), Flevoland, NL 5.235,00 N 522,00 E colourring read Maarten Hotting

ID certain in 2022: mother is Caspian Gull cachinnans, father is 4CY (hybrid?) Caspian Gull cachinnans n[F|N].

date            
12-04-2022 Cachinnans-type n-F|N guarding high on dam 2.
             
01-05-2022 Cachinnans-type n-F|N walks from nest in small bush, high on dam 2. Below him is nest 061Z.
  Cachinnans female landed next to n-F|N, and this femaler is ringed on tarsus! (in retrospect: never seen again this bird).
             
04-05-2022 Two adults at nest. Female cachinnans and 4CY n-F|N.
  3 eggs egg no: width (mm) length (mm) volume (cm3):  water test on May 4th: 
    A egg 49,9 74 -- --
    B egg 47,9 68,5 -- --
    C egg 50 71 -- --
   
09-05-2022 3 eggs. We trapped n-F|N at the nest. No measurements taken.
   
17-05-2022 3 eggs.
   
22-05-2022 3 eggs.
   
30-05-2022 n-F|N at nest. 2 chicks.
  pullus metal darvic mass wing H+B Bill
    .5625183 r-7.B 87 25 53,9 18,4
  pullus 1 pullus dead in nest.
   
02-06-2022 Cachinnans-type n-F|N defending nest.
   
17-06-2022 Cachinnans-type n-F|N at nest.
   
21-06-2022 Nest empty, Chick r-7.B not found in vegetation.
   
12-07-2022 Photographed r-7.B.
   
  In 2022 one chick ringed in this nest: r-7.B.

below: Caspian Gull cachinnans 7.B 2CY, July 14 2023, Markermeer, the Netherlands. Picture: Thijs Horst & Maarten Hotting.

below: Caspian Gull cachinnans 7.B 2CY, April 27 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.B 2CY, January 12 2023, Tarnos - Landes, France. Picture: Geoffroy Chabot.

below: Caspian Gull cachinnans 7.B 1CY, July 12 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.B 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[7.B] cachinnans from nest n[F|N]. Picture: May 30th, 2022.
Ringed May 30th. No confirmation on 2 other eggs.