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 019

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 019 positioned high on artificial breakwater dam 1, 20 meters west of y-PNED. Nest in dense complex of Blackberry vegetation, with cluster with Spoonbills.
  • ID in 2021 certain: both partners are Caspian Gull cachinnans.
  • Nest marked with red flag. Location is close to nest 36-2020.
location Nest between Spoonbills, April 26, 2021. Eggs April 16th, 2021: 3 eggs clutch. June 8th, 2021: partners & 2 chicks at blocks.
 
partner 1 June 8th, 2021: partner 1 = male cachinnans. June 8th, 2021: partner 1 = male cachinnans. June 8th, 2021: partner 1 = male cachinnans.
 
partner 2 April 26th, 2021: female in Blackberry complex. June 8th, 2021: partner 2 = female cachinnans. June 8th, 2021: partner 2 = female cachinnans.
 
partner? On May 6th, 2021, we assumed this to be one of the partners: male Caspian Gull cachinnans. Note different P5 pattern.
     

Visits and data.

date:              
  egg no: width (mm): length (mm): volume (cm3):  water test on April 16th: laying date:  
16-04-2021 A 48,4 70,9 83,63 30 - tip bottom   3 eggs in nest.
16-04-2021 B 50,5 70,8 90,91 50 - tip bottom  
16-04-2021 C 49,4 68,8 84,54 55 - tip bottom  
sum nest: 259,07
       
26-04-2021 1 parent present at nest, between Spoonbills.
       
13-05-2021 No visit, Camilla is catching a Spoonbill.
   
06-05-2021 Picture of one partner: male cachinnans.
   
15-05-2021 No visit, thunder coming in.
   
28-05-2021 No visit.
   
08-06-2021 2 large pulli & 2 parents on the blocks near the waterfront at north side. Next time, easy to trap.