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 De Kreupel XLHD 21

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 on island "B". Nest coded "B01" in 2021, but renamed after the code on ringed adult.
location April 9th, 2021. April 9th, 2021. .
   
partner 1: April 9th, 2021: male g[XLHD] hybrid type. April 9th, 2021: male g[XLHD] hybrid type. June 17th, 2021: male g[XLHD] hybrid type.
 
partner 2: April 9th, 2021: female Herring Gull. April 9th, 2021: female Herring Gull. .
   
pulli: May 14th, 2021: pullus p[FG]. May 14th, 2021: pullus p[FJ]. .
   
       

Visits and data.

Date: Egg no: Width (mm)  Higth (mm) Volume (cm3)   Details:
9-4-2021 A egg 51.5 70.3     3 eggs. Male is German g[XLHD], female is unringed.
  B egg 51.1 69.5     https://waarneming.nl/observation/210425539/
  C egg 51.9 72.3      
             
23-4-2021         3 eggs. Attempt to trap adult with cage. Failed.
   
14-5-2021 Metal: Tibia: Head + Bill: Tasus: Mass (gr): No eggs. 2 chicks out of nest. Where is 3rd chick?
5556706 Pale FG 62.8 38.7 162 https://waarneming.nl/observation/214568915/
5556707 Pale FJ 63.5 40.6 203
       
     
20-5-2021     No chicks near nest, but recent shit traces present. Alarming parents. .
     
28-5-2021     Alarming male approx 50 meters west. Pulli guarded to better hiding place?
    https://waarneming.nl/observation/215267282/
4-6-2021     Alarming male.
    https://waarneming.nl/observation/216519571/
17-6-2021     Alarming male.
    https://waarneming.nl/observation/217411696/