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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Cachinnans - nest Lelystad 133

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 133 positioned on dam 1, just 6 mtr west of nest 19, 6 mtr east of 134.
  • ID certain in 2022: parents are male Caspian Gull type (short tongue on P10 may indicate hybrid, otherwise nice cachinnans) and female Caspian Gull.
location April 27th, 2022: nest location. April 27th, 2022: nest location. April 27th, 2022: 3 eggs.
 
partner 1 May 1st 2022: partners at nest. May 1st 2022: partners at nest. May 17th, 2022: partners at nest.
 
partner 1 May 4th, 2022: partner 1 is cachinnans. May 17th, 2022: partner 1 is cachinnans. May 17th, 2022: partner 1 is cachinnans.
 
partner 2 April 27th, 2022: partner 2 is argenteus type. April 27th, 2022: partner 2 is cachinnans type.  
     

Visits and data 2022 for nest 133:
Estimation egg laying: A-egg = April 23 2022. Estimating hatching = May 21 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):       
27-04-2022 A 52,6 75,2 -- 30 - tip bottom 3 eggs  
  B 51,9 76,8 -- 40 - tip bottom  
C 48,1 68,5 -- flat bottom
sum nest: --
   
01-05-2022 Herring Gull argenteus at nest.
04-05-2022 Caspian and Herring Gull at nest.
09-05-2022 3 eggs.
17-05-2022 3 eggs. Caspian and Herring Gull at nest.