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 025

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 025 positioned at breakwater 2 high on the top, "nest near the wooden beam, which is the lookout".
  • ID 2020 certain, Caspian Gull cachinnans; one partner 4CY with obvious sub-adult patterns, other partner probably 5CY.
location April 27th, 2020: nest location. April 27th, 2020: 2 eggs clutch.  
   
partner 1 May 7th, 2020: cachinnans 4CY? May 7th, 2020: cachinnans 4CY? May 7th, 2020: cachinnans 4CY?
 
partner 2 May 7th, 2020: cachinnans. . .
     
pulli May 21st, 2020: pullus b[F|A]. May 21st, 2020: pullus b[F|B]. .
   

Visits and data.

datum: egg no: width (mm) length (mm) volume (cm3):   
27-04-2020 A 45,3 70,3 72,64 2 eggs in the nest. Sub-adult Caspian at the lookout.
27-04-2020 B 47,5 68 77,25  
  sum nest: --
21-05-2020 pulli   Nest empty. Two chicks close-by, ringed b[F|A] & b[F|B].