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 5.9 1CY, May - June 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Red tibia ring r[5.9] and metal NLA 5.625.144, ringed as pullus Larus cachinnans at nest r-FC on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
ID certain in 2022, both parents are Caspian Gull cachinnans. Father is r[F.C], trapped as breeding Caspian Gull in 2021 at nest 108, now breeder at nest 104, which is 200 mrts east and with a different partner.

Visits and data 2022 for nest r-FC:
Estimation egg laying: A-egg = April 14 2022. Estimating hatching = May 12 2022.

date:                  
  r-F.C former breeder at T-split, now breeding in eastern part of dam 1, neighbour of y-PNED.
15-04-2022 1 egg in nest. Nest coded "104".
  egg no: width (mm) length (mm) volume (cm3):  water test on April 15th:     
  A egg 72,6 50,8 -- 00 - flat on bottom    
19-04-2022 y-PNED close near nest "104", but apparently not the partner.
27-04-2022 2 egg in nest. Extra yellow-black flag placed.
  r-FC present at nest.
  egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:     
  A egg     -- 90 - tip on bottom    
  B egg 72,2 49,2 -- 80 - tip on bottom    
01-05-2022 r-FC present at nest.
17-05-2022 2 chicks in nest. One throws up food: fish.
  Food: Rounded Gobt 5,19 gr.
  metal darvic mass        
  .5625144 r-59 101        
  .5625145 r-58 142        
28-06-2022 r-5.8 photographed.
12-07-2022 r-5.8 photographed.

below: Caspian Gull cachinnans 5.9 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

From this 2-egg nest, r[5.9] ringed on May 17th, but not recorded since.
Sibling r[5.8] cachinnans fledged.