Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse

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Argenteus - nest Lelystad r-6.C

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 r-6.C positioned on breakwater dam 1 south, small Blackberry bush at edge of tarmac, 12 meters east of nest 128. Flagged pole placed next to nest.
  • ID uncertain in 2022: one parent is adult Herring Gull argenteus, trapped as breeder in 2022 and ringed r[6.C]. Probably partner also Herring Gull.
location May 22nd, 2022: 3 eggs in nest. May 22nd, 2022: 3 eggs in nest. May 30th, 2022: 2 chicks + 1 egg.
 
partner 1 May 22nd, 2022: Herring Gull r-6.C. June 28th, 2022: Herring Gull r-6.C at Almere. .
   
pullus May 30th, 2022: NLA 5.625.185 & NLA 5.625.186 & 1 egg . .
     

Visits and data:
Estimation egg laying: A-egg = May 01 2022. Estimating hatching = May 29 2022.

date            
22-05-2022 nest with 3 eggs, code '246Z', for Herring Gull control group. Herring Gull trapped at nest.
  metal: darvic: wing: Head + Bill: Gonys: Mass: Greytone:
  NLA 5625154 r-6.C 422 116,2 18,9 866 4.0
30-05-2022 2 chicks in nest. Both too small for darvic. Only metal rings. (<3 days age)
  NLA .5625185
  NLA .5625186
21-06-2022 pullus NLA .5625185 dead in nest. No sign of other metal ringed bird NLA .5625186
28-06-2022 r-6C adult Herring Gull photographed at dump Almere - De Vaart.