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 248

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 248 positioned on dam 2 west section: 22 mtr W of blue sign VHF20 and 22 mtr east of lighthouse. Between bushes, top of dam, visible from N side. Coded 248.
  • ID uncertain in 2023: oner parent is cachinnans, other parent unknown. Likely, both cachinnans.
location April 9th, 2023: nest location dam 2. April 9th, 2023: full clutch, with 3 eggs. .
   
pullus July 8th, 2023: fledged r[7.0]. June 25th, 2023: fledged r[7.1]. June 18th, 2023: fledged r[7.Z].
 

Data for nest 248-2023:

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: known parents?
cach x cach 248-2023 71,2 52,5 98,81 71,2 51,7 95,82 72,5 51,3 96,07 290,70 No.
ring pulli: May 10 laying A egg: April 05 hatch A egg: May 03
     
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
Pullus 11-5-2023 NLA 5625196 r 7.Z largest chick
Pullus 11-5-2023 NLA 5625197 r 7.0 smallest chick
Pullus 11-5-2023 NLA 5625198 r 7.1 middle chick
Pullus 18-6-2023 r-7Z
Pullus 18-6-2023 r-71
Pullus 18-6-2023 r-70
 
248-2023
dam: dam 2 west
location: 22 mtr W of blue sign VHF20 and 22 mtr east of lighthouse. Between bushes, top of dam, visible from N side. Coded 248
breeders: cach x cach
OBSERVATIONS:
04-04-2023 adult 1 cach at nest location.
09-04-2023 3 eggs. 3 eggs measured. No watertest, chick ringing in 1st session.
26-04-2023 3 eggs.
11-05-2023 3 pulli ringed
27-05-2023 nest empty, no chicks found.
18-06-2023 pulli r-70, r-71 & r-7Z have fledged.
25-06-2023 pulli r-70, r-71 & r-7Z present, all 3 chicks fledged.