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 C06 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 "C06" in season 2021.
  • 1 parent seems to be Herring Gull argentatus-type.
partner 1: May 20th, 2021. . .
     
pulli: May 14th, 2021: pullus p[FR]. June 11th, 2021: pullus p[FR]. June 11th, 2021: pullus p[FR].
 
  May 14th, 2021: pullus p[FS]. June 11th, 2021: pullus p[FS]. June 11th, 2021: pullus p[FS].
 
  May 14th, 2021: pullus p[FT]. June 11th, 2021: pullus p[FT]. June 11th, 2021: pullus p[FT].
 
prey: May 14th, 2021: 1x Roach; 2x Eel. May 20th, 2021: 1x Roach; 1x Rounded Goby. June 11th, 2021: Roach 4x vomited.
 
  June 11th, 2021: Roach 4x & Perch 1x vomited. . .
     

Visits and data.

Date: details:          
           
14-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  Prey: 1x Roach; 2x Eel. NLA 5.556.713 Pale FR 92 54.6 31.9
  https://waarneming.nl/observation/214662060/ NLA 5.556.714 Pale FS 106 56.8 33.3
    NLA 5.556.715 Pale FT 76 51.3 29.1
   
20-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
  Prey: 1x Roach; 1x Rounded Goby. NLA 5.556.713 Pale FR 313 71.1 52.0
  https://waarneming.nl/observation/214706998/ NLA 5.556.714 Pale FS 296 72.4 57.5
    NLA 5.556.715 Pale FT 207 67.0 --
             
11-6-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
  Prey: 4x Roach & 1x Perch (vomited) NLA 5.556.713 Pale FR 1094 117.0 278.5
  https://waarneming.nl/observation/216984901/  NLA 5.556.714 Pale FS 917 113.4 277.5
    NLA 5.556.715 Pale FT 1104 114.7 253.0