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 139

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 139 positioned on dam 1 eastern part, 65 mtr west of the lighthouse. Most eastern nest on dam 1. Nest on top of dam.
  • ID certain in 2022: parents are both adult Caspian Gulls.
location April 27th, 2022: nest location. April 27th, 2022: nest location. April 27th, 2022: 3 eggs.
 
partner 1 May 4th, 2022: partner 1 is cachinnans. April 27th, 2022: partner 1 is cachinnans. April 27th, 2022: partner 1 is cachinnans.
 
partner 1 May 4th, 2022: partner 1 is cachinnans. May 4th, 2022: partner 1 is cachinnans. May 4th, 2022: partner 1 is cachinnans.
 
partner 2 April 29th, 2022: partner 2 is Herring Gull type argenteus. April 29th, 2022: partner 2 is Herring Gull type argenteus. April 29th, 2022: partner 2 is Herring Gull type argenteus.
 
partner 2 April 29th, 2022: partner 2 is Herring Gull type argenteus.    
     
pullus May 22nd, 2022: pullus r[6.K]. June 22nd, 2022: pullus r[6.L]. May 22nd, 2022: pullus r[6.M].
 

Visits and data 2022 for nest 136:
Estimation egg laying: A-egg = April 12 2022. Estimating hatching = May 10 2022.

    egg no: width (mm): length (mm): water test April 27th:  
27-Apr-22 3 eggs A egg 73,5 50,5 tip bottom - 70 gr Flag 139 attached.
B egg 72,5 52,3 tip bottom - 40 gr
C egg 70 51 tip bottom - 40 gr
29-Apr-22 2 adults.  female has thin P5 band and standing bird is HG type.
male has cachinnans wing, but bulbuous bill
01-May-22 together with LBBGs
04-May-22 partner 1 present. Images
metal darvic mass wing H+B
22-May-22 pullus .5625162 r-6K 158 33 62,8
pullus .5625163 r-6L 160 35 63,4
pullus .5625164 r-6M 98 30 55,8
21-Jun-22 pullus r-6.L on blocks at nest 135. Both r-6L and r-6M fledged.
partner 2 is defending chick