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 036

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 036 positioned at breakwater 1, 20 meters west of y[PNED]. Code marked at block near nest.
  • ID 2020 uncertain, male scores good for Caspian Gull cachinnans, female could be hybrid.
location May 7th, 2020: hatching eggs. May 7th, 2020: hatching eggs, A = pullus. May 7th, 2020: hatching eggs: B = small hole.
 
partner 1 May 7th, 2020: female cachinnans? May 7th, 2020: female cachinnans? May 7th, 2020: female cachinnans?
 
partner 2 May 7th, 2020: male cachinnans. May 7th, 2020: male cachinnans. May 7th, 2020: male cachinnans.
 

Visits and data.

date: egg no: width (mm) length (mm) volume (cm3):  pullus:  
07-05-2020 A   Chick - 2 days old. Eggs hatching.
07-05-2020 B 50,5 71,5 91,81 Egg intact - small hole.  
07-05-2020 C 49,7 68,1 84,70 Egg intact - complete.
      sum nest: --    
21-05-2020 pulli     Nest empty, but shit traces. Chicks audible, calling from underneath dense Blackberry, not caught.