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

Herring Gull argenteus NLA 6.525.104 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Metal NLA 5.625.104, ringed as pullus Larus argentatus at nest 62 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Jeroen Nagtegaal ringing team.
ID certain in 2022: same female as in 2021 (probably hybrid Caspian Gull cachinnans with broad medial band on P10, thin broken band on P5). Uncertainty about partner.

Visits and data 2022:
Estimation egg laying: A-egg = April 13 2022. Estimating hatching = May 11 2022.
   
12-04-2022 empty nest.
   
15-04-2022 2 eggs in nest.            
  egg no: width (mm) length (mm) volume (cm3):         
15-04-2022 A egg 50,1 68,1 --        
15-04-2022 B egg 51,6 68,4 -- water test on April 27th:       
27-04-2022 C egg 50,3 66,8 -- floating halfway      
  sum nest: --        
   
01-05-2022 Adult at nest 62: very thin line on P5 but clear cachinnans influences
   
09-05-2022 3 eggs: small crack in blue egg.
   
17-05-2022 1 pullus and 2 eggs present.
  prey: half fish at nest probably Rudd.
    metal code darvic mass  
  pullus NLA 5.625.104 - 165 Large pullus (16-18 days old), likely cachinnans from nest 60.
   
22-05-2022 Blue egg still present. No chicks found near nest, but hiding in Blackberry complex.

below: Herring Gull argenteus NLA 6.525.104 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.