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 Lelystad 229

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 229 positioned on dam 2: 25 mtr east of lighthouse, old Spoonbill nest, between bushes = nest 229-2022 of sub-adults.
  • ID certain in 2022: both immature (4CY) cachinnans.
  • ID certain in 2023: location now occupied by female is y-X56A (from nest 206-2022). Partner is adult male cachinnans.
location April 27 2023: location of nest. May 11 2023: egg hatching. .
   
partner 1 April 09 2023: cachinnans y-X56A. April 27 2023: cachinnans y-X56A. April 27 2023: cachinnans y-X56A.
 
partner 2 May 13 2023: male cachinnans partner. May 13 2023: male cachinnans partner. .
   
pullus cachinnans r-7.Y fledged in 2023. cachinnans r-7.8 fledged in 2023. cachinnans g-7|U fledged in 2023.
 

Visits and data:

egg sizes & volume 2023
SPECIES NEST A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST: known parents?
cach x cach 229-2023 74 50 93,15 72,7 50,5 93,35 70,2 51,5 93,75 280,24 X56A &cach
ring pulli: 15-mei laying A egg: 10-apr hatch A egg: 8-mei
     
catch: date: metal: darvic: mass: wing: head+bill:      
pullus 11-5-2023 5.556.455 r-7Y -- -- --
pullus 11-5-2023 5.556.456 r-78 -- -- --
pullus 18-5-2023 5.556.410 g-7|U 166 -- 63
pullus 18-5-2023 5.556.455 r-7Y 221 -- 65
pullus 27-5-2023 5.556.410 g-7|U 362 -- --
pullus 27-5-2023 5.556.455 r-7Y 499 -- --
pullus 25-6-2023 5.556.456 r-78 1028 355 128,1
   
229-2023 y[X56A] is breeding in 229 (X56A was at nest 206 in 2022)
dam: dam 2 west
location: 25 mtr east of lighthouse, old Spoonbill nest, between bushes = nest 229-2022 of sub-adults.
breeders: cach x cach
OBSERVATIONS:
09-04-2023 y-X56A present north of dam. (27/4: yX56A not breeding at this nest in 2023).
26-04-2023 eggs: 3 eggs. Measured and water test: A/B/C:all are 90 - tip bottom.
nest: code 229 sprayed on entrance block.
27-04-2023 adult: parent 1 = yX56A
11-05-2023 pulli: 2 chicks ringed, 3rd egg hatching.
13-05-2023 adult: partner 2 is cach.
18-05-2023 pulli: 2 chicks present (R-7Y and unringed one, which is now ringed).
27-05-2023 pulli: 2x ringed birds measured: g-7|U & r-7Y.
18-06-2023 adult: ad yX56A easy at bread.
25-06-2023 pulli: r-78 and g-7|U present.