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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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 C.T 1CY, May 09 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[C.T] and metal NLA 5.625.068, ringed as pullus Larus cachinnans at nest 14 on May 09 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID certain in 2022, both parents are the same as previous year, Caspian Gull cachinnans.

Visits and data:
Estimation egg laying: A-egg = April 09 2022. Estimating hatching = May 07 2022.

date:        
11-04-2022 adult near nest.
             
  egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
15-04-2022 A egg 51,7 70 -- 10 - tip on bottom 3 eggs.
B egg 51,7 76,7 -- 30 - tip on bottom  
C egg 51,7 72,1 -- 20 - tip on bottom  
         
19-04-2022 guarding adfult on block.
             
29-04-2022 A egg float - 1 mm      
  B egg float - 2 mm      
  C egg float - 1 mm      
             
  metal tibia mass head + bill wing  
09-05-2022 5625068 r-C.T       cachinnans
  5625069 r-C.U       cachinnans
  1 egg, hatching soon (A-egg).    
             
  metal tibia mass head + bill wing  
17-05-2022 5625069 r-C.U 363 --   cachinnans
  5625136 r-5.2 206 69,7   cachinnans
30-05-2022 from the boat one ringed chick visible, not found back later between blocks.
17-06-2022 two ringed chicks present, possibly 3rd as well, but not seen.
21-06-2022 r-52 swimming, together with r-54 (from nest y-X56A). R-CU & r-CT not seen.
21-06-2022 Later this day: now r-52 swimming in creche with another 3 juveniles, including r-CU. Not all legs visible, to check for rings.
17-07-2022 r-52 photographed.

below: Caspian Gull cachinnans C.T 1CY, May 09 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[C.T] cachinnans from nest 14. Picture: May 9th, 2022.
Ringed on May 9th and not recorded since, although possibly present at nest on June 17th. Sibling r[C.U] & r[5.2] fledged.