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 048 (was nest 15B in 2021)

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 048 was labeled "nest 15B" in season 2021, then renamed. Positioned at breakwater 2, just west of nest 015 (which has a mark on a block), hidden behind small prunus (avium?).
  • In 2022: exact same location.
  • ID certain in 2021: partners are Herring Gull argenteus and Caspian Gull cachinnans.
location Nest on May 7th, 2020 (with Albert de Jong) April 16th, 2021. April 26th, 2021.
 
courtship March 30th, 2021. March 30th, 2021. March 30th, 2021.
 
partner 1 April 16th, 2021: female is Herring Gull. April 26th, 2021. .
   
partner 2 April 26th, 2021. April 26th, 2021: black on P4. April 26th, 2021.
 
partner 2 April 19th, 2022: Caspian Gull. may 4th, 2022: Caspian Gull.  
   
eggs Eggs April 15th, 2020: 1 egg clutch. Eggs April 24th, 2020: 3 eggs clutch. Eggs June 26th, 2020: 2 eggs clutch as 2nd attempt.
 
  May 9th, 2022: 3e eggs.    
     
pullus May 15th, 2021. May 15th, 2021. May 28th, 2021: 2 dead chicks.
 

Visits and data.

date:            
  egg no: width (mm) length (mm) volume (cm3):  water test on April 16th:  
16-04-2021 A 47,1 71,3 79,64 00 - flat on bottom 1 egg present, red flag 15 placed near nest.
         
24-04-2021         water test on April 24th:  3 eggs. Small branches cut away. Herring Gull and Caspian Gull present.
  A egg     70 - tip bottom  
  B egg 48 70,8 82,13 50 - tip bottom  
  C egg 46,4 70,9 76,86 35 - tip bottom  
      sum nest: 238,63    
26-04-2021 Female Herring Gull breeding. Male Caspian Gull on block in front of nest.
15-05-2021 1 egg hatching.
  2 chicks present in nest: Mass = 59 gr & Mass = 71 gr.
28-05-2021 Two pulli dead in nest (approx 1 week ago, drown after heavy storm?).
08-06-2021 No activity.    
26-06-2021 2 eggs in nest! Still, also 2 dead chicks in nest, but 2nd attempt started.