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 L05 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 "L". Nest coded "L05" in season 2021.
location: May 28th, 2021: unringed adult Caspian Gull cachinnans (female type) near nest. Pulli moved out of camera view.
     
pulli: May 14th, 2021: pullus r[K.W]. May 14th, 2021: pullus r[K.X]. May 14th, 2021: pullus r[K.Y].
 
prey: May 14th, 2021: Roach 2x. May 20th, 2021: Roach 2x. May 20th, 2021: Roach 2x.
 

Visits and data.

Date: details:          
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 50.7 70.0
  B egg 50.9 71.7
C egg 50.3 74.6
Attempt to trap breeding adult. Adult Caspian Gull cachinnans trapped, but escaped.
           
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Roach 3x. NLA 5.556.728 Red K.W 73 48.0 27.5
https://waarneming.nl/observation/214663776/ NLA 5.556.729 Red K.X 87 52.9 29.8
    NLA 5.556.730 Red K.Y 81 52.5 30.4
         
20-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill:  
Prey: Roach 2x. NLA 5.556.728 Red K.W 204 62.7  
https://waarneming.nl/observation/214709851/ NLA 5.556.729 Red K.X 271 69.0  
  NLA 5.556.730 Red K.Y 256 69.0  
         
28-5-2021 Camera trap near nest: 1 unringed adult. https://waarneming.nl/observation/224226824/