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 118Z

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 118 positioned on dam 1 south section. Control group Herring Gull nest to compare parameters.
  • ID certain in 2022: both adult Herring Gull argenteus.
location April 27th, 2022: location of nest. April 27th, 2022: 3 eggs. May 1st, 2022: adult at nest.
 
partner 1: May 4th, 2022: adult at nest. June 21st, 2022 food bolus. June 21st, 2022 food bolus.
 
pullus May 30th, 2022 pullus r[6.9]: fledged. May 30th, 2022 pullus r[6.+]. June 21st, 2022 pullus NLA 5.625.148: fledged.
 

Data for nest 118Z-2022:
Estimation egg laying: A-egg = April 22 2022. Estimating hatching = May 20 2022.

27-Apr-22 3 eggs A egg 68 47,9 tip bottom - 0 gr
B egg 71 49,8 tip bottom - 20 gr
C egg 69 51,1 tip bottom - 20 gr
01-May-22 adult breeding
04-May-22 3 eggs 2 adults are Herring Gull.
09-May-22 3 eggs
17-May-22 3 eggs
metal darvic mass wing age
22-May-22 pullus 5625148 - 116 33 3 days
pullus 5625149 - 64 27 2 days
metal darvic mass wing H+B Bill
30-May-22 pullus 5625149 r-69 287 45 68,8 24,5
pullus 5625180 r-6+ 230 42 65,7 22,4
17-Jun-22 adult present
    ring mass H+B Bill Tarsus Wing
21-Jun-22 pullus 5625148 869 117,3 41,7 70 270
pullus r-6.+ 635 98 38,9 68,6 207
             
12-Jul-22 picture of r-69.