Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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

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Cachinnans - nest 167

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 167 positioned on section "dam 1 blocks", just 2,5 meters south of nest y-P:U60. Nest visible from south side. Discovered late in season.
  • ID certain in 2023: both parents are adult Caspian Gull cachinnans.
nest May 13th, 2023: 2 eggs & 1 chick hatching. . .
     
partner 1 May 13th, 2023: adult cachinnans. May 13th, 2023: adult cachinnans. May 13th, 2023: adult cachinnans.
 
partner 1 May 13th, 2023: adult cachinnans. . .
     
partner 2 May 13th, 2023: adult cachinnans. May 13th, 2023: adult cachinnans. May 13th, 2023: adult cachinnans.
 
partner 2 May 13th, 2023: adult cachinnans. . .
     
pullus June 25th, 2023: juvenile g[7|E]. June 25th, 2023: juvenile g[7|F]. .
   

Visits and data:

egg sizes & volume 2023
SPECIES NEST  
cach x cach 167-2023
ring pulli: May 18th.
 
catch: date: metal: darvic: mass: wing: head+bill:
pullus 18-5-2023 5556497 G-7|E 167 60,5
pullus 18-5-2023 5556498 G-7|F 123 56,4
pullus 18-6-2023 g-7|E
pullus 18-6-2023 g-7|F
   
167-2023 NEW NEST
dam: dam 1 
location: Blocks dam 1 - 2,5 mtr SW of PU60. Visible from South.
breeders: cach x cach
OBSERVATIONS:
13-05-2023 eggs 1 egg, 1 egg hatching, 1 small pullus
13-05-2023 adult partner 2 = partner 1 nest 26-2022, that time 4cy cach.
18-05-2023 pulli: 2 chicks ringed, 3rd dead in nest
18-06-2023 adult partner 1 with chicks.
18-06-2023 pulli: both chicks g-7|E & g-7|F present.
25-06-2023 pulli: both chicks g-7|E & g-7|F present. Two chicks fledged.