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 240

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 240 positioned on dam 2 east part between blocks. Nest is 5 mtr east of nest corner flag, on top of dam. Long branch added and code 220 sprayed on block, and wood with blue rope added on north side.
  • ID certain in 2022: parents are Herring Gulls. Birds for Herring Gull control group.
location May 4th, 2022: nest location, view from south. May 4th, 2022: nest location, view from north. May 4th, 2022: nest location.
 
nest May 4th, 2022: nest 3 eggs. May 4th, 2022: nest, view from south. May 4th, 2022: nest, view from north.
 
hatching May 30th, 2022: 2 pulli ringed & 1 egg. July 12th, 2022: NLA 5.625.169 fledged. May 30th, 2022: 2 adult Herring Gulls.
 

Visits and data 2022 for nest 136:
Estimation egg laying: A-egg = May 1 2022. Estimating hatching = May 29 2022.

  egg no: width (mm): length (mm): volume (cm3):  water test April 27th:    
04-05-2022 A-egg 49,2 66,3 -- 10 - tip bottom 3 eggs  
  B-egg 50,6 69,1 -- 40 - tip bottom  
C-egg 50 70,6 -- 20 - tip bottom
sum nest: --
22-05-2022 3 eggs.
 
  metal: darvic: age:        
04-05-2022 .5625169 - 2 days old        
  .5625170 - 1 day old      
1 egg: in tact without cracks.
adults: 2 adult Herring Gulls at nest location.
   
02-06-2022 adults: 2 adult Herring Gulls at nest location.
   
12-07-2022 adults between nest 220 & nest 240: 2 adult Herring + 1 chick and 1 adult LBBG + 1 chick.