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 D07 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 "D07" in season 2021.
  • Both parents are Caspian Gull cachinnans.
partner 1: May 20th, 2021: male Caspian Gull. May 20th, 2021: male Caspian Gull. May 20th, 2021: male Caspian Gull.
 
partner 2: May 20th, 2021: female Caspian Gull. May 20th, 2021: male Caspian Gull. .
   
pulli: May 14th, 2021: pullus r[K.L]. May 14th, 2021: pullus r[K.M]. May 14th, 2021: pullus r[K.N].
 
  May 20th, 2021: 2 pulli (r-K.M is dead). . .
     
prey: May 14th, 2021: Roach/Rudd 2x. May 14th, 2021: Roach/Rudd 2x. .
   

Visits and data.

Date: details:          
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 49.1 68.3
  B egg 48.8 70.6
Attempt to trap breeding adult. Failed. C egg 49.7 70.7
         
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Roach / Rudd spec. 2x NLA 5.556.719 Red K.L 73 48.6 27.3
https://waarneming.nl/observation/214662857/ NLA 5.556.720 Red K.M 80 53.5 29.8
NLA 5.556.721 Red K.N 96 53.6 29.2
           
20-5-2021 2 chicks & 1 dead chick (recent, r-K.M). metal: tibia: mass (gr): head + bill: tarsus:
Red K.M & metal 5556720 will be reused. NLA 5.556.719 Red K.L 217 64.8  
  NLA 5.556.720 Red K.M 96 61.6  
NLA 5.556.721 Red K.N 271 70.7  
  Camera trap near nest: 2 pulli & 2 unringed adults.          
  https://waarneming.nl/observation/223638304/          
   
11-6-2021 1 chick near nest. metal: tibia: mass (gr): head + bill: wing:
  https://waarneming.nl/observation/216985629/  NLA 5.556.721 Red K.N 880 109.5 271.0