Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse

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Cachinnans - nest Lelystad 117Z

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 117 positioned on dam 1 south section, 40 meter west of nest 61Z. Control group Herring Gull nest to compare parameters.
  • ID certain in 2022: both are adult Herring Gull argenteus.
location April 27th, 2022: location of nest. April 27th, 2022: 3 eggs. May 4th, 2022: 3 eggs in nest.
 
partner 1:   May 4th, 2022: adult at nest. May 30th, 2022: food bolus is sausage.
 
pullus May 30th, 2022 pullus r[5.=]. May 30th, 2022 pullus r[5.+]. .
   

Visits and data:
Estimation egg laying: A-egg = April 19 2022. Estimating hatching = May 17 2022.

27-Apr-22 3 eggs A egg 68,8 48,3 tip bottom - 35 gr
B egg 70,1 48,1 tip bottom - 80 gr
C egg 68,5 48 tip bottom - 50 gr
01-May-22 adult Herring near nest
04-May-22 3 eggs with Herring Gull
09-May-22 3 eggs
17-May-22 2 eggs male is Herring, female possibly Caspian?
metal darvic mass wing Head+Bill
22-May-22 pullus 5625146 r-5+ 205 44 64,4
pullus 5625147 r-5= 98 29 54,2
1 egg intact          
metal darvic mass wing H+B Bill
30-May-22 pullus 5625146 r-5+ 375 72 78 30,5
pullus 5625147 r-5= 336 51 72,3 25,8
  1 egg infertile
  food: r[5.=] threw up sausage
17-Jun-22 adult present