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 D08 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 "D08" in season 2021.
  • ID is uncertain: male is y[X311] Caspian Gull cachinnans ringed as pullus in Germany, female is unringed Herring Gull argentatus hybrid-type.
pulli: May 20th, 2021: pullus b[D|S]. May 20th, 2021: pullus b[D|T]. May 20th, 2021: pullus b[D|U].
 
  June 11th, 2021: pullus b[D|S]. June 11th, 2021: pullus b[D|S]. .
   
  June 11th, 2021: pullus b[D|U]. June 11th, 2021: pullus b[D|U]. June 11th, 2021: pullus b[D|U].
 
prey: May 20th, 2021: Eel 1x. May 20th, 2021: Rounded Goby 2x. May 20th, 2021: Rounded Goby 2x.
 

Visits and data.

Date: details:          
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 53.0 75.3
  B egg 51.0 73.7
Attempt to trap breeding adult. Failed. C egg 52.1 78.6
         
14-5-2021 3 eggs in nest.          
             
             
20-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Rounded Goby 2x; Eel 1x. NLA 5.556.753 b-D|S 149 61.1 35.0
https://waarneming.nl/observation/214707477/ NLA 5.556.754 b-D|T 108 56.3 32.8
NLA 5.556.755 b-D|U 163 62.3 36.2
           
20-5-2021 Camera trap near nest: 3 pulli & 2 adults. Caspian Gull cachinnans male y[X311] from Germany & Herring Gull type / hybrid female.
           
11-6-2021 2 chicks near nest. metal: tibia: mass (gr): head + bill: wing:
  https://waarneming.nl/observation/216987545/ NLA 5.556.753 b-D|S 1057 110.3 240.0
    NLA 5.556.755 b-D|U 1130 114.1 249.0