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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Cachinnans - nest Lelystad 231

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 108 positioned on dam 1 at T split. 10 meters from nest 21.
  • ID certain in 2022: both immature (4CY) cachinnans, one trapped at the nest and ringed r[C.S].
location April 27th, 2022: location of nest. April 15th, 2022: location of nest. April 15th, 2022: 1 egg.
       
       
       
partner 2 May 4th, 2022 4CY cachinnans. May 4th, 2022 4CY cachinnans. .
       
pullus May 17th, 2022 pullus r[5.G]. May 17th, 2022 pullus r[5.H]. .
       
prey      
       

Visits and data.

date:              
11-04-2022 nest ready. Still empty.
   
12-04-2022 2 birds at nest site.
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
15-04-2022 A 48,1 70,9 -- --    
27-04-2022 A       float - 1 mm  
27-04-2022 B 67,9 47,7 -- 80 - tip on bottom
sum nest: --
   
04-05-2022 4CY at nest.
   
09-05-2022 4CY trapped at nest. Rings: metal = NLA 5.625.067 & darvic = r[C.S].
Biometrics: wing 446; tarsus 69,2; head+bill 127,2; bill 59,1; gonys 18,0; mass 1025 gr.
       
17-05-2022   metal darvic mass
pullus NLA 5.625.106 r-5.G 151
pullus NLA 5.625.107 r-5.H 89
prey Roach & Eel (50 cm).