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 047

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 047 positioned high on artificial breakwater dam 2, location is 17 meters east of blue sign, between Spoonbill nests (temporarily labeled "nest 13 2021", then renamed "47").
  • ID in 2021 uncertain: at least one of the partners is Caspian Gull cachinnans.
location Eggs April 16th, 2021: 3 eggs. April 26th, 2021: partner 1 at nest. April 26th, 2021: partner 1 at nest.
 
partner 1 April 26th, 2021: partner 1 = cachinnans. April 26th, 2021: partner 1 = cachinnans. April 26th, 2021: partner 1 = cachinnans.
 

Visits and data.

date:              
  egg no: width (mm): length (mm): volume (cm3):  water test on April 24th: laying date:  
16-04-2021 A 52,1 73,5 100,45 40 - tip bottom   nest with 3 eggs.
16-04-2021 B 50,5 71 91,17 40 - tip bottom  
16-04-2021 C 48,3 70 82,22 30 - tip bottom  
sum nest: 273,84
     
26-04-2021 1 parent at eggs. Constantly fights with Spoonbills, which nest within 1 meter. Therfore, no visit.
       
15-05-2021 Attacking parent. Nest is empty, but sound of chicks in vegetation. However, impossible to trace the chicks.
       
28-05-2021 No visit, nest was empty last week anyway.
       
08-06-2021 No chicks, no parent present / visible.