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 055-2022

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 55 positioned at breakwater 2 - east, high between blocks; nest "with the orange jerrycan".
  • ID 2022 certain, both partners are adult Caspian Gull cachinnans.
location April 29th, 2022: nest location. May 9th, 2020: 2 eggs & 1 pullus just hatched. May 4th, 2022: 2 parents.
 
partner 1 May 4th, 2022: cachinnans male. May 4th, 2022: cachinnans male. April 29th, 2022: cachinnans male.
 
partner 2 May 4th, 2022: cachinnans female. May 4th, 2022: cachinnans female. May 4th, 2022: cachinnans female.
 

Visits and data.

15-apr-22 3 eggs A egg 72,3 50 tip bottom - 60 gr nest is location nest 55-2021. Orange jerrycan placed next to nest.
B egg 70,8 50 tip bottom - 30 gr  
C egg 66,4 48,5 tip bottom - 10 gr
29-apr-22 3 eggs A egg float - 4 mm
B egg float - 3 mm
C egg float - 4 mm
04-mei-22 adult 2 partners at nest.
in flight: inner edge of subterminal band P9 diffeernt. male has P4 spot.
09-mei-22 pull 1 chick (B egg), 2 eggs hatching.