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 252

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 252 positioned on dam 2 central section: 2 mtr W of nest 18 "nest with blue rope", on S-side of dam 2. Black plastic sprayed with white + sign, nicknamed "vuilnisbakkie".
  • ID certain in 2023: both parents are cachinnans, male is sub-adult.
location April 9th, 2023: nest location dam 2. April 26th, 2023: full clutch, with 3 eggs. May 13th, 2023: Caspian parents.
 
partner 1 April 27th, 2023: sub-adult male cachinnans. April 27th, 2023: sub-adult male cachinnans. April 27th, 2023: sub-adult male cachinnans.
 
partner 2 April 27th, 2023: adult female cachinnans. April 27th, 2023: adult female cachinnans. April 27th, 2023: adult female cachinnans.
 
pullus May 11th, 2023: pullus r[7.9]. May 11th, 2023: pullus r[7.+]. July 8th, 2023: fledged g[8|8].
 

Data for nest 252-2023:

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:
cach x cach 252-2023 73,5 48,1 85,62 74 49,2 90,19 70,5 49 85,23 261,04
ring pulli: May 12 laying A egg: April 07 hatch A egg: May 05
     
catch: date: metal: darvic:
pullus 11-5-2023 5.556.457 r-7.9 few days old
pullus 11-5-2023 5.556.458 r-7.+ few days old
pullus 18-5-2023 mass: head+bill: nothing present
pullus 27-5-2023 5.625.262 g-8|8 577 262
   
252-2023 Nest "dustbin" (Vuilnisbakkie)
dam: dam 2 central
location: 2 mtr W of nest 18 "nest with blue rope". Black plastic sprayed with white + sign.
breeders: cach x cach
OBSERVATIONS:
09-04-2023 nest: 2 eggs measured. No watertest.
26-04-2023 nest: 3 eggs. Measured.
27-04-2023 adult: adult female cach & 5/6CY male cach
11-05-2023 pulli: 2 chicks ringed, other chick?
13-05-2023 adult:
18-05-2023 pulli: Nest empty, no chicks found
27-05-2023 pulli: 1x extra pullus ringed and measured.
25-06-2023 pulli: G-8|8 present. At least 1 bird fledged.