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 227

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 227 positioned on old Spoonbill nest, between bushes at dam 2. East of blue sign VHF20, about 25 meters: nest with the "blue rope".
  • ID certain in 2022: both immature cachinnans, one is 4CY male and one is 5CY female.
location April 29th, 2022: nest with blue rope. April 29th, 2022: nest behind bushes. April 29th, 2022: 2 eggs, already floating.
 
partner 1 April 29th, 2022: male 4CY cachinnans. April 29th, 2022: 4CY cachinnans. April 29th, 2022: 4CY cachinnans.
 
partner 2 May 4th, 2022: female 5CY cachinnans. May 4th, 2022: 5CY cachinnans. May 4th, 2022: 5CY cachinnans.
 
pullus May 9th, 2022: pullus r[C.P]. May 9th, 2022: pullus r-[C.R]. .
   

Visits and data.

date: egg no: width (mm): length (mm): volume (cm3):       
29-04-2022 A 48,2 69,3 -- float - 4 mm    
  B 48,2 67,6 -- float - 4 mm  
sum nest: --
4CY is breeding.  
   
04-05-2022 5Cy at nest.
   
09-05-2022 Loads of fish in nest. Smelly.
2 pulli.    
NLA 5625065 r-C.P    
NLA 5625066 r-C.R