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 222

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 222 positioned high on breakwater dam 2 at the north side, 8 meters east of nest 17.
  • ID uncertain in 2022, female is argenteus, male is hybrid type (rich yellow legs, red orbital, bulbuous bill, pale iris, broad band P5, broad medial band on P10, darker grey deck).
location May 1st, 2022: nest (view from north). April 29th, 2022: 2 eggs. April 29th, 2022: 2 eggs.
 
partner 1 May 1st, 2022: female argenteus. May 4th, 2022: female argenteus. May 4th, 2022: female argenteus.
 
partner 2 May 4th, 2022: male is hybrid "river gull". May 4th, 2022: male is hybrid "river gull". May 4th, 2022: male is hybrid "river gull".
 

Visits and data.

date            
29-04-2022 2 eggs egg no: width (mm) length (mm) volume (cm3):  water test on April 29th: 
    A 73,8 51,6 -- 15 - flat on bottom
    B 73,1 52,7 -- 10 - flat on bottom
01-05-2022 2 birds at nest, male 'river gull' hybrid type (rich yellow legs, red orbital, bulbuous bill, pale iris, broad band P5, broad medial band on P10). Female is Herring Gull.
04-05-2022 2 birds at nest. Female breeds.
09-05-2022 3 eggs.