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 111

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 111 positioned on dam 1, just east of bend, 40 mtr west of PNED.
  • ID certain in 2022: parents are male Caspian Gull type (short tongue on P10 may indicate hybrid, otherwise nice cachinnans) and female Caspian Gull.
location April 19th, 2022: nest location. May 1st, 2022: nest location with male. April 15th, 2022: 3 eggs.
 
partner 1 April 27th, 2022: female 1 is cachinnans. April 27th, 2022: female 1 is cachinnans. .
   
partner 2 May 1st, 2022: partner 2 is cachinnans type. April 27th, 2022: partner 2 is cachinnans type. .
   
pullus May 9th, 2022: pullus r[C.H]. May 9th, 2022: pullus r[C.J]. July 17th, 2022: juvenile r[C.J].
 

Visits and data 2022 for nest 111:
Estimation egg laying: A-egg = April 3 2022. Estimating hatching = May 1 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):       
15-04-2022 A 53,2 71,7 -- 90 - tip bottom 3 eggs  
  B 52,6 72,5 -- 60 - tip bottom  
C 50,5 70,8 -- 70 - tip bottom
sum nest: --
   
  egg no:     3 eggs, 1 adult has short white tongue on P10: hybrid?    
27-04-2022 A float - 1 mm          
  B float - 1 mm        
C float - 3 mm    
  Cach and cachinnans type at nest.
   
04-05-2022 Cachinnans type male at nest.
   
  metal darvic mass H+B      
09-05-2022 .5625058 r-C.H -- --
09-05-2022 .5625059 r-C.J -- --
17-05-2022 .5625058 r-C.H 416 81,8
21-05-2022 r-CH & r-CJ and another unringed chick swimming and flying between the dams.
28-06-2022 r-CH & r-CJ photos.
17-07-2022 r-CH & r-CJ photos.