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 w-8.Z (122Z)

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).
  • In 2022 nest w-8.Z positioned on breakwater dam 1 south, north side. Coded in series Herring nests for control group, code 122 sprayed on tarmac.
    In 2023 same location.
  • ID certain in 2022: both parents are adult Herring Gull argenteus, one of the parents already ringed w-8.Z.
  • ID certain in 2023: both parents are adult Herring Gull argenteus, one of the parents already ringed w-8.Z.
location April 27th, 2022: nest. May 1st, 2022: nest 122Z next to n-F|N. .
   
nest April 27th, 2022: 1 egg in nest. May 4th, 2022: 3 eggs in nest. May 30th, 2022: pullus r-7.A.
 
partner 1 May 1st, 2022: Herring Gull w-8.Z. May 4th, 2022: Herring Gull w-8.Z. July 12th, 2022: Herring Gull w-8.Z.
 
partner 2 May 1st, 2022: Herring Gull. May 1st, 2022: Herring Gull. .
   

Visits and data:
Estimation egg laying: A-egg = April 26 2022. Estimating hatching = May 24 2022.

date            
27-04-2022 1 egg egg no: width (mm) length (mm) volume (cm3):  water test on April 27th: 
    A egg 47,7 66,5 -- 0 - flat bottom
01-05-2022 2 adult Herrings at nest, one is ringed w-8Z.
04-05-2022 code '122' sprayed on tarmac. 2x Herring Gulls (incl w-8Z) at nest.
  3 eggs egg no: width (mm) length (mm) volume (cm3):  water test: 
    A egg 48,6 66,5 -- --
    B egg 45,6 68,2 -- --
    C egg 47,9 68,3 -- --
17-05-2022 3 eggs.
22-05-2022 3 eggs.
30-05-2022 No chicks found.
  metal: darvic: wing: Head + Bill: Bill: Mass:  
  NLA .5625182 r-7.A 30 56,3 18,5 145  
12-07-2022 w-8Z photographed.
   
09-04-2023 Male teus and female teus w8Z. Display on blocks N-side, close to nest.
27-04-2023 Male teus and female teus w8Z. Display on blocks N-side, close to nest.
13-05-2023 Both parents present.
25-06-2023 Both parents present, at least 1 chick.