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 C03 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 "C". Nest coded "C03" in season 2021.
pulli: May 20th, 2021: pullus b[D|P]. June 11th, 2021: pullus b[D|P]. June 11th, 2021: pullus b[D|P].
 
  May 20th, 2021: pullus b[D|N]. June 11th, 2021: pullus b[D|P]. .
   
prey: May 20th, 2021: Roach. May 20th, 2021: Roach. May 20th, 2021: Roach.
 

Visits and data.

Date: details:          
           
23-4-2021 2 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
    A egg 50.9 63.6  
    B egg 50.9 68.9  
  Attempt to trap breeding adult. Failed.          
             
14-5-2021 2 eggs in nest.          
             
20-5-2021 2 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  Prey: 3x Roach. NLA 5.556.751 b-D|N 115 56.5 32.2
  https://waarneming.nl/observation/214707132/ NLA 5.556.752 b-D|P 73 47.8 27.0
   
11-6-2021 2 chicks near nest. metal: tibia: mass (gr): head + bill: wing:
  https://waarneming.nl/observation/216984848/  NLA 5.556.751 b-D|N - 104.4 228.5
    NLA 5.556.752 b-D|P 681 93.3 182.5