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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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.