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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Cachinnans - nest Lelystad 032

General remarks:

  • Eggs: Volume measured by Stonehouse (1964) and Spaans & Spaans (1975), which make comparison possible with data from Texel (Camphuysen pers comm 16.04.2020).
  • Nest 032 positioned at breakwater 2, 10 meters east of nest 016.
  • ID 2020 certain, both parents are Caspian Gull cachinnans.
  • Ringed chick quickly after fledging reported from England (click links on thumbnails below).
eggs / pulli May 7th, 2020: 3 eggs clutch. May 21st, 2020: pullus b[F|D]. July 27th, 2020: juvenile b[F|D] in England.
 
partner 1 June 2nd, 2020: male cachinnans. June 2nd, 2020: male cachinnans. June 2nd, 2020: male cachinnans.
 
partner 2 June 2nd, 2020: female cachinnans. June 2nd, 2020: female cachinnans. June 2nd, 2020: female cachinnans.
 

Visits and data.

datum: egg no: width (mm) length (mm) volume (cm3):  water test on April 15th:  
07-05-2020 A 50,4 70,5 92,10 90 - floating, 5mm above surface 3 eggs in the nest. Male with sub-adult pattern.
07-05-2020 B 50,4 67,9 86,84 90 - floating, 3mm above surface  
07-05-2020 C 48,1 66,1 77,00 90 - floating, 5mm above surface
  sum nest: 255,95
21-05-2020 pulli     One chick with mole as prey, otherwise empty nest. Pullus ringed b[F|D].
         
02-06-2020 parents     Two partners at nest.