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 n-F|8

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 n-F|8 positioned on dam 2: central, 8 mtr NW of 17, only visible from N side.
  • ID certain in 2023: male is 4CY n-F|8 and partner is adult female cachinnans.
partner 1 April 27 2023: n-F|8 at dam 2. April 27 2023: n-F|8 at dam 2. .
   
  May 13 2023: n-F|8. May 13 2023: n-F|8. .
   
pullus Fledged juvenile g-7|Y, June 25 2023. Fledged juvenile g-8|A, June 25 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 nF|8 72,2 52,2 99,06 71,1 49,1 86,30 71 51,1 93,35 278,71 new nest
ring pulli: -- laying A egg: -- hatch A egg: --
 
catch: date: metal: darvic: mass: wing: head+bill:      
Pullus 18-05-2023 5.556.417 g-7|Y 163 -- 64,3
Pullus 27-05-2023 5.556.417 g-7|Y 470 -- --
Pullus 27-05-2023 5.625.191 g-8|A 487 -- --
 
n-F|8
dam: dam 2 central.
location: Dam 2 central, 8 mtr NW of 17, only visible from N side. Behind red crate, close to bushes. Code sprayed.
breeders: cach x cach
OBSERVATIONS:
27-04-2023 adult:
30-04-2023 nest: 3 eggs. Measured. Watertest: A: 1 mm - floating
adult: nF8 breeding. Later: unringed partner. Both large birds. B: 2 mm - floating
11-05-2023 nest: 3 eggs hatching C: 1/2 way - floating
18-05-2023 pulli: 1 chick ringed, other 2 not found
27-05-2023 pulli: 1x control, 1x new chick ringed
25-06-2023 pulli: g-7|Y, g-8|A and n-F|8 present