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 031

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 031 positioned at breakwater 2, 15 meters west of blue VHF20, on top of old Spoonbill nest.
  • ID 2020 certain, both Caspian Gull cachinnans, one parent has sub-adult patterns in wing.
location May 7th, 2020: nest location: old Spoonbill nest. .
   
partner 1 May 7th, 2020: sub-adult cachinnans. May 7th, 2020: sub-adult cachinnans.
 
pullus May 21st, 2020: pullus b[F|E]. .
   

Visits and data.

date: egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
07-05-2020 A 48,2 74,5 87,15 90 - tip on bottom 3 eggs in the nest, both partners cachinnans, one sub-adult.
07-05-2020 B 50,7 72,6 93,96 90 - tip on bottom  
07-05-2020 C 48,2 73,8 86,33 90 - tip on bottom
      sum nest: 267,44    
21-05-2020 --     Nest empty, one chick found, ringed b[F|E].
Prey in nest: 4 fishes (3x roach, 1x perch).