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 056

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 056 positioned high on breakwater dam 2, near black table (flotsam and jetsam nearby nest), hence nest called "black table nest".
  • ID certain in 2021, both parent's characteristics match pure Caspian Gull cachinnans.
location Nest "black table" on top of dam April 26th, 2021. Nest April 24th, 2021: 3 eggs clutch. Nest 15th, 2021: 1 hatched chick & 2 eggs.
 
partner 1 April 24th, 2021: cachinnans parent, moulting. April 24th, 2021: cachinnans parent, moulting. April 24th, 2021: cachinnans parent, moulting.
 
partner 1 April 26th, 2021: cachinnans parent, moulting.    
     
partner 2 may 13th, 2021: cachinnans parent.    
   

Visits and data.

date            
16-04-2021 Patrolling adult and landing at location. We did not climb the dam to search.
             
24-04-2021 3 eggs egg no: width (mm) length (mm) volume (cm3):  water test on April 24th: 
    A 50,5 71,1 91,30 20 - flat on bottom
    B 49,8 67,2 83,91 30 - flat on bottom
    C 48,4 63,3 74,66 20 - flat on bottom
    sum nest: 249,87  
   
26-04-2021 Moulting parent attacks from nest and start patrolling.
13-05-2021 Partner 2 at nest and aggressive. Do they have chicks maybe?
   
   
15-05-2021 2 eggs in nest.
  1 hatched chick (1 day old). Mass = 61 gr.
   
28-05-2021 1 egg rotten in nest.
  Alarming parent, but chicks not found in dense vegetation, despite intense search.
   
08-06-2021 No birds present.
   
26-06-2021 No chicks found.