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 027

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 027 positioned at breakwater 2 near white-red lighthouse (nest 11).
  • ID certain, Caspian Gull cachinnans; on April 27th two partners with right wingtip pattern. One partner with sub-adult patterns.
  • Nest visited at May 7th, 2020: no trace of breeding attempt, hence season failed.
location April 27th, 2020: 3 eggs clutch.
 

Visits and data.

datum: egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
27-04-2020 A 52 70 95,30 90 - tip on bottom 3 eggs in the nest, partners okay for cachinnans.
27-04-2020 B 51,4 66,6 88,59 90 - tip on bottom  
27-04-2020 C 51,2 70,4 92,92 90 - tip on bottom
  sum nest: 276,82
07-05-2020 --     Nest empty. No egg shells.