Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Leon Kelder
Mars Muusse

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Caspian Gull cachinnans F.A 1CY, May & August 2021, Lelystad-Almere, the Netherlands. Picture: Albert de Jong & Eric Roeland.

Pullus which may belong to Caspian Gull cachinnans nest 53, but uncertain (may belong to adjacent LBBG nest).
First images of r-F.A in juvenile pluamge, by Eric Roeland, give strong cachinnans feeling.
Brother/sister is b-F|=.

Visits and data.

date:            
16-04-2021 Nest checked. 3 eggs.
  egg no: width (mm): length (mm): volume (cm3):  water test on April 24th: laying date:
  A 49,2 70 85,32 30 - tip bottom  
  B 50,6 67,1 86,50 15 - tip bottom  
  C 50,3 70,1 89,30 35 - tip bottom  
sum nest: 261,12
   
24-04-2021 Michahellis present.
   
26-04-2021 Michahellis present, but is this the exact location of nest 53? Flag has fallen down.
   
06-05-2021 2 cachinnans at this location, but flag has fallen down, no exact position determined from water.
   
13-05-2021 No visit, Camilla is trapping a Spoonbill.
   
15-05-2021 3 eggs in nest near flag, with brownish pattern, resembling LBBG-eggs. Was this measured on May 6th? 1,5 meters east another nest, 2 bluish eggs, more like cachinnans.
  Landing adult cachinnans at this nest photographed; LBBG near flag 53 photographed.
   
28-05-2021 Two pulli ringed.
    metal ring darvic ring head + bill age
  pullus .5559425 b-F|= 52,8 age: 2 / 3 days old
  pullus .5559426 r-F.A 50,8 age: 2 / 3 days old
  egg: just hatching.
   
8-6-2021 No visit.

below: Caspian Gull cachinnans F.A 1CY, August 22 2021, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans F.A 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong, Roland-Jan Buijs & Mars Muusse.