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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Cachinnans - nest Lelystad 127Z

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 123Z positioned on dam 1 south, 2 meters north of 62, visible from north side. Part of "control group Herring Gulls".
  • ID uncertain in 2022: likely both adults are Herring Gull.
location April 27th, 2022: location of nest. April 27th, 2 eggs. May 4th, 2022: 3 eggs.
 

Visits and data:
Estimation egg laying: A-egg = April 25 2022. Estimating hatching = May 23 2022.

date:              
19-04-2022 nest is empty        
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
27-04-2022 A-egg 47,5 69,5   0 - tip on bottom    
  B-egg 47,2 69,1   0 - tip on bottom    
               
01-05-2022 adult Herring Gull breeding at nest  
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
04-05-2022 A-egg 47,4 69,3 --      
  B-egg 47,1 69,2      
  C-egg 47 66,3 --  
sum nest: --
04-05-2022 adult Herring Gull breeding at nest  
   
09-05-2022 3 eggs
       
17-05-2022 3 eggs      
       
22-05-2022 3 eggs    
       
30-05-2022 2 eggs, and no chick found.
   
21-06-2022 2 eggs, rotten