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 M04 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 "M". Nest coded "M04" in season 2021.
pulli: May 20th, 2021: pullus b[D|B]. May 20th, 2021: pullus b[D|B]. June 11th, 2021: pullus b[D|B].
 
  June 11th, 2021: pullus b[D|B]. June 11th, 2021: pullus b[D|B]. .
   
  May 20th, 2021: pullus b[D|C]. June 11th, 2021: pullus b[D|C]. June 11th, 2021: pullus b[D|C].
 
  June 11th, 2021: pullus b[D|C]. June 11th, 2021: pullus b[D|C]. .
   

Visits and data.

Date: details:          
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 50.0 78.1
  B egg 45.8 74.5
Attempt to trap breeding adult. Failed.          
           
           
14-5-2021 2 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
b-D|B with eye-injury left. NLA 5.556.745 b-D|B 115 59.7 35.8
https://waarneming.nl/observation/214664108/ NLA 5.556.746 b-D|C 133 60.1 35.3
         
20-5-2021 Empty nest.          
           
11-6-2021 2 pulli in nest. metal: tibia: mass (gr): head + bill: wing:
b-D|B with blind left eye. NLA 5.556.745 b-D|B 480 90.8 135.9
https://waarneming.nl/observation/216987838/ NLA 5.556.746 b-D|C 847 109.7 286.5