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 124Z

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, 15 meters east of nest 61, central talud. Part of "control group Herring Gulls".
  • ID certain in 2022: both adults are Herring Gull.
location April 27th, 2022: location of nest. April 27th, 2022: 3 eggs. .
   
partners May 1st, 2022: two adults near nest. May 4th, 2022: adult near nest. May 30th, 2022: two adults near nest.
 
pullus May 22nd, 2022: 2x pulli . .
     

Visits and data:
Estimation egg laying: A-egg = April 24 2022. Estimating hatching = May 22 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):  water test    
27-04-2022 A-egg 46,9 77,2 -- 20 - tip on bottom    
  B-egg 48,5 70,5   0 - tip on bottom  
  C-egg 48,1 72 -- 20 - tip on bottom
sum nest: --
   
04-05-2022 3 eggs
adult Herring Gull at nest.
   
09-05-2022 3 eggs
       
17-05-2022 3 eggs      
       
22-05-2022   metal darvic mass wing H+B
pullus NLA 5.625.155 --       small, 3 days old.
pullus NLA 5.625.156 --       small, 2 days old.
       
30-05-2022 adult Herring Gull at nest
               
02-06-2022 adult Herring Gull at nest
   
17-06-2022 adult Herring Gull at nest