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

Red tibia ring r[5.N] and metal NLA 5.625.113, ringed as pullus Larus cachinnans at nest 110 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
ID uncertain, one parent is Caspian Gull cachinnans, other parent unknown (possibly sub-adult Herring Gull?).

Visits and data 2022 for nest 53 (coded 110 in 2022):
Estimation egg laying: A-egg = April 9 2022. Estimating hatching = May 7 2022.

    length (mm) width (mm) volume (cm3):  water test on April 15th:     
15-04-2022 A egg 67,8 50,3 -- 20 gr - tip bottom    
  B egg 68,8 49 -- 20 gr - tip bottom    
  C egg 69,8 50,9 -- 30 gr - tip bottom    
  Code "110" sprayed on block. Within 10 minutes afetr leaving, 4 (!) cachinnans at this spot.
               
    length (mm) width (mm) volume (cm3):  water test on April 27th:     
27-04-2022 A egg -- -- -- 3 mm - floating    
  B egg -- -- -- 3 mm - floating    
  C egg -- -- -- 1 mm - floating    
   
17-05-2022 Ringing chicks (chicks are approx 8 days old): sub-adult cachinnans attacks us. Is this parent 2? Adult cachinnans present too.
    metal darvic mass      
  pullus NLA 5625112 r-5P 180      
  pullus NLA 5625113 r-5N 219      
   
    metal darvic mass wing H+B bill
30-05-2002 pullus NLA 5625187 r-7D 734 175 97,8 39,9
Check: really pullus from this nest?  
One adult cachinnans is guarding near chicks = parent 1. But 3 more cachinnans present; likely nest 110 and 113 combined.
   
21-06-2022 r-7D and r-5P and one unringed chick (sibling?) swim near nest 109. Also stand on blocks.
   
28-06-2022 r-7D and r-5N picture.
   
28-06-2022 r-7D and r-5P picture. All 3 ringed chicks have fledged.

below: Caspian Gull cachinnans 5.N 1CY, June 28 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

r[5.N] cachinnans from nest 110. Picture: June 28th, 2022.
Fledged. Sibling r[5.P] & r[7.D] also fledged.

below: Caspian Gull cachinnans 5.N 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.