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 5.K 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[5.K] and metal NLA 5.625.108, ringed as pullus Larus cachinnans at nest 21 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
ID in 2022 uncertain. One parent is Caspian Gull, other parent not photgraphed.

Visits and data 2022:
Estimation egg laying: A-egg = April 6 2022??? Estimating hatching = May 4 2022.

11-04-2022 Nest is ready, still no eggs.        
               
12-04-2022 From distance: adult guarding nest.        
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
15-04-2022 A-egg 50,7 70,1 -- 20 - tip on bottom    
  B-egg 51,4 67,9   10 - tip on bottom  
sum nest: --
White jerrycan placed next to nest.  
   
  egg no: width (mm): length (mm): volume (cm3):  water test    
27-04-2022 A-egg -- --   3 mm - floating    
  B-egg -- --   2 mm - floating  
  C-egg 49,3 65,3   80 - tip on bottom
   
09-05-2022 From distance: adult at nest. Picture: bird has extra mirror, on P8.
   
17-05-2022   metal darvic mass wing H+B
pullus NLA 5.625.108 r-5.K 118    
pullus NLA 5.625.109 r-5.J 189    
               
17-06-2022 From distance: several larger chicks between blocks at this locations. No rings read, unfortunately.
       
21-06-2022 From distance: no activities at nest. No rings read, unfortunately.

r[5.K] cachinnans from nest 21. Picture: May 17th, 2022.
Ringed on May 17th and not recorded since, although several chicks present on June 17th, maybe including this chick. Same for sibling r[5.J].