Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Leon Kelder
Mars Muusse

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Cachinnans - nest Lelystad 014

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 014 positioned at breakwater 2.
  • ID certain in 2020, both parents are Caspian Gull cachinnans.
  • ID certain in 2021, both parents are the same as previous year, Caspian Gull cachinnans.
  • ID certain in 2022, both parents are the same as previous year, Caspian Gull cachinnans.
location Nest location on April 15th, 2020. April 16th, 2021. April 26th, 2021: female on block.
 
eggs Eggs April 15th, 2020: 3 egg clutch. Eggs April 15th, 2022: 3 egg clutch. .
   
partner 1 April 27th, 2020: cachinnans. . .
   
partner 1 April 16th, 2021. April 16th, 2021: P9 with thin band. .
   
partner 1 April 12th, 2022: male is cachinnans. April 11th, 2022: male is cachinnans. April 11th, 2022: male is cachinnans.
 
partner 2 May 7th, 2020: cachinnans. May 7th, 2020: cachinnans. .
   
partner 2 April 26th, 2021: female cachinnans. April 26th, 2021: P9 with broad band. April 26th, 2021: female cachinnans.
 
partner 2 April 29th, 2022: female cachinnans. April 29th, 2022: female cachinnans. April 29th, 2022: female cachinnans.
 
pullus May 21st, 2020 pullus n[F|=]. May 21st, 2020 pullus n[F|+].  
   
pullus June 8th, 2021: female with chick. June 26th, 2021: pullus r[F.L] .
   
  June 26th, 2021: pullus r[F.M] June 26th, 2021: pullus r[F.N] .
   
pullus May 9th, 2022: pullus r[C.T]. May 9th, 2022: pullus r[C.U]. May 17th, 2022: pullus r[5.2].
 

Visits and data.

datum: egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
15-04-2020 A 50,5 76,9 98,74 35 - tip on bottom 3 eggs in nest.
  B 50,4 77,2 98,74 25 - tip on bottom  
  C 50,4 71,8 91,83 15 - tip on bottom  
  sum nest: 289,31
27-04-2020 Certainty about parents, cachinnans.
   
21-05-2020 pullus Nest empty, with fish. 2 chicks ringed. n[F|=].
  pullus Nest empty, with fish. 2 chicks ringed. n[F|+].
   
02-06-2020 pulli n[F|=] together with large juvenile, so nest with 3 juveniles fledged?
         
date:        
  egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
16-04-2021 A egg 52,2 73,9 101,39 40 - tip on bottom 3 eggs.
B egg 51,2 73,7 97,28 40 - tip on bottom  
C egg 50,2 68,7 87,17 30 - tip on bottom  
         
         
26-04-2021 Partner 1 at blocks in front of nest. Seemingly same parents as last year.
         
15-05-2021 3 eggs. (in retrospect: we should have checked for presence of letters on the eggs. Was this the still the same brood as on April 26th?)
         
28-05-2021 2 eggs + 1 chick (1 day old). What has been the breeding period for these eggs??? Was there a rapid 2nd attempt in late April???
  Female at nest, but P10 slightly ackward for pure cachinnans? (probably wrong bird?)
   
08-06-2021 Male is cachinnans.
  Female appears at blocks with one chick.
         
  metal tibia mass head + bill wing  
26-06-2021 .5550684 r-F.L 859 111,7 264 cachinnans
  .5550685 r-F.M 948 112,8 252 cachinnans
  .5550686 r-F.N 912 112,2 228 cachinnans
             
date:        
11-04-2022 adult near nest.
             
  egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
15-04-2021 A egg 51,7 70 -- 10 - tip on bottom 3 eggs.
B egg 51,7 76,7 -- 30 - tip on bottom  
C egg 51,7 72,1 -- 20 - tip on bottom  
         
19-04-2022 guarding adfult on block.
             
29-04-2022 A egg float - 1 mm      
  B egg float - 2 mm      
  C egg float - 1 mm      
             
  metal tibia mass head + bill wing  
09-05-2022 5625068 r-C.T       cachinnans
  5625069 r-C.U       cachinnans
  1 egg, hatching soon.    
             
  metal tibia mass head + bill wing  
17-05-2022 5625069 r-C.U 363 --   cachinnans
  5625136 r-5.2 206 69,7   cachinnans