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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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.