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 003

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 003 positioned high on artificial breakwater 1 between blocks, west of nest 001.
  • Certainty on ID in 2020, breeders are Caspian Gull cachinnans. In 2021: same birds.
location Nest in vegetation: 2020. April 26th, 2021: male cachinnans at nest. .
   
eggs April 15th, 2020: 1 egg clutch. April 27th, 2020: 3 eggs clutch. April 16th, 2021: nest cachinnans, marked code '3'.
 
partner 1 May 7th, 2020: male cachinnans. May 7th, 2020: male cachinnans. June 2nd, 2020: male cachinnans.
 
  April 26th, 2021: male cachinnans. April 26th, 2021: male cachinnans. April 26th, 2021: male cachinnans.
 
partner 2 May 7th, 2020. May 7th, 2020. .
   
  April 16th, 2021: female cachinnans. July 9th, 2021: female cachinnans.  
   
pulli May 21st, 2020 pullus n[F|R]. May 21st, 2020 pullus n[F|S]. May 21st, 2020 pullus n[F|T].
 
  May 28th, 2021 pullus r[F.D]. May 28th, 2021 pullus r[F.E]. July 9th, 2021: unringed chick & female cachinnans.
 

Visits and data.

date: egg no: width (mm) length (mm) volume (cm3):  water test on April 27th: laying date:  
15-04-2020 A 50,3 72,3 92,10 90 - floating, 4mm above surface    
             
27-04-2020 B 50,1 71,5 90,36 90 - hafway in water   Both parents have cachinnans wing pattern.
27-04-2020 C 47,9 70,3 81,21 90 - tip at bottom  
   
sum nest: 263,68  
21-05-2020 pulli Empty nest, 3 chicks near nest, ringed n[F|R], n[F|S], n[F|T].
     
     
date:    
16-04-2021 One adult is 100% certain partner 2 2020. Alert adult near nest.
  Nest with 3 eggs.
  egg no: width (mm) length (mm) volume (cm3):  water test on April 16th:  
  A egg 50,5 75,1 96,43 35 - tip at bottom  
  B egg 50,4 72,1 92,21 40 - tip at bottom  
  C egg 49,5 72,3 89,20 30 - tip at bottom  
      sum nest: 277,84  
         
24-04-2021 3 eggs present.
         
26-04-2021 Adult very reluctant to leave the nest.
         
06-05-2021 No visit.
   
13-05-2021 No visit, due to Spoonbills settling.
     
15-05-2021 No visit, due to thunder.  
         
28-05-2021   metal tibia mass (gr) head + bill (mm)  
  pullus .5559428 r-F.D 707 93,3  
  pullus .5559429 r-F.E 641 93  
         
08-06-2021 One guarding adult, near location where we ringed chicks.
         
26-06-2021 No visit, due to narrow timeframe.
   
09-07-2021 Female at blocks, right beneath nest 3, with fledged unringed juvenile.