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 De Kreupel 201U 21

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 on island "D". Nest coded "D04" in season 2021, but renamed after the code on ringed adult.
eggs: May 14th, 2021. . .
     
partner 1: May 20th, 2021: female Caspian Gull w[201:U]. May 20th, 2021: female Caspian Gull w[201:U]. May 20th, 2021: female Caspian Gull w[201:U].
 
partner 2: May 14th, 2021: male Caspian Gull cachinnans. May 14th, 2021: male Caspian Gull cachinnans. May 20th, 2021: male Caspian Gull cachinnans.
 
  May 20th, 2021: male Caspian Gull cachinnans. May 20th, 2021: male Caspian Gull cachinnans. May 20th, 2021: male Caspian Gull cachinnans.
 
pulli: May 20th, 2021: pullus b[D|0]. May 20th, 2021: 2 pulli, 1 ringed. .
   
prey: May 20th, 2021: Roach 1x.    
     

Visits and data.

Date: details:            
           
23-4-2021 1 egg in nest. egg no: width (mm): length (mm): volume (cm3): 
Attempt to trap breeding adult. Failed. A egg 50.6 73.8
           
14-5-2021 2 eggs in nest.        
2 adults near nest. One ringed w[201:U].      
https://waarneming.nl/observation/214662645/            
           
20-5-2021 1 egg hatching & 1 chick. metal: tibia: mass (gr): head + bill: tarsus:  
Prey: 1x Roach. NLA 5.556.757 b-D|0 75 48.6 27.8  
https://waarneming.nl/observation/214707336/            
  Camera trap near nest: 1 pullus & 2 adults.            
  https://waarneming.nl/observation/223648760/            
   
28-5-2021 2 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  Unringed male Caspian & w[201:U] female Caspian. NLA 5.556.757 b-D|0 231 66.7 41.6  
    NLA 5.556.771 r-B.2 168 61.2 36.2