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

Home

Cachinnans - nest Lelystad y-X56A

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 206 positioned on dam 2, 8 meters west of blue sign VHF20.
  • ID certain in 2022: both cachinnans.
location April 29th, 2022: nest location. April 15th, 2022: 2 eggs. May 9th, 2022: 3 eggs. Hatching day.
 
partner 1 April 29th, 2022: y-X56A is cachinnans. April 11th, 2022: y-X56A is cachinnans. April 29th, 2022: partner 1 y-X56A is cachinnans.
 
partner 2 April 29th, 2022: partner 2 is cachinnans. April 29th, 2022: partner 2 is cachinnans. April 29th, 2022: partner 2 is cachinnans with broad medial band on P10.
 
pullus June 28th, 2022: r-5.3 fledged. June 28th, 2022: r-5.4 fledged. June 28th, 2022: r-5.5 fledged.
 

Visits and data.

date:              
11-04-2022 yellow ring at this location, can it be y-X56A?  
     
12-04-2022 2 adults near nest.  
               
  egg no: width (mm): length (mm): volume (cm3):       
15-04-2022 A 52,2 74,5 -- 20 - tip bottom 3 eggs  
  B 52,7 74,2   10 - tip bottom  
sum nest: --
   
19-04-2022 2 adults near nest.  
   
  egg no:     3 eggs, 2 adults (incl y-X56A).    
29-04-2022 A float - 3 mm          
  B float - 2 mm        
C float - halfway    
   
09-05-2022 3 eggs. Hatching day for B egg. Small hole in egg.
   
  metal colour mass        
17-05-2022 .5625139 r-54 251        
  .5625140 r-55 181      
.5625141 r-53 225  
   
02-06-2022 adult y-X56A present on bread.
   
17-06-2022 r-55 flying around; parent y-X56A ferociously protect the chick.
   
21-06-2022 adult y-X56A present. Chicks r-53, r-54, r-55 swimming around.
  food: we catch r-55, throws up fish food.
   
28-06-2022 adult y-X56A present. Chicks r-53 & r-55 photographed.
   
12-07-2022 Chick r-55 photographed.