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 207

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 207 positioned on old Spoonbill nest on dam 2, just 7 meters east of blue sign VHF20.
  • ID certain in 2022: both cachinnans.
  • ID certain in 2023: both cachinnans. Exact same location on old Spoonbill nest. Partner 1 same as in 2022.
location April 19th, 2022: nest location. April 29th, 2022: 2 eggs, 1 egg missing. April 29th, 2022: 1 egg hatching.
 
nest April 9th, 2023: full clutch (3 eggs). . .
     
partner 1 April 29th, 2022: partner 1 is cachinnans. April 29th, 2022: partner 1 is cachinnans. April 29th, 2022: partner 1 is cachinnans.
 
partner 1 April 11th, 2023: top of P8 broken. April 11th, 2023: top of P8 broken. May 27th, 2023: same adult cachinnans as in 2022.
 
partner 2 April 29th, 2022: partner 2 is cachinnans. April 19th, 2022: partner 2 is cachinnans. April 29th, 2022: partner 2 is cachinnans.
 
pullus May 9th, 2022: pullus r-C.K. June 25th, 2023: 1 chick fledged r-7.T. .
   

Visits and data.

date:            
12-04-2022 2 adults near nest.
             
  egg no: width (mm): length (mm): volume (cm3):     
15-04-2022 A 48 69 -- 90 - tip bottom 3 eggs
  B 51 69,2   90 - tip bottom  
  C 52,6 73,1 -- 90 - tip bottom  
sum nest: --
   
19-04-2022 2 adults near nest.  
   
29-04-2022 2 eggs. One egg is hatching, small hole. 1 egg may rolled out of the nest (old Spoonbill nest).
   
09-05-2022 2 adults at nest. One chick located and ringed.
1 pullus.
NLA 5625061 r-C.K    
   
 
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 207-2023 73,4 52 99,93 72,5 51,4 96,44 71,6 50 90,13 286,50 same as 2022
     
ring pulli: May 10 laying A egg: April 05 hatch A egg: May 03
     
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 11-5-2023 NLA5625192 r 7.T 468 -- 80.8
   
207-2023 "Nest Blikkie"
dam: dam 2 west
location: nest S-side, 7 mtr E of VHF20. Is 207-2022 on old Spoonbill nest. 
breeders: cach x cach
 
OBSERVATIONS:
09-04-2023 nest: 3 eggs measured. Watertest C-egg: 35 - tip bottom
26-04-2023 nest: 3 eggs.
11-05-2023 pull 1 ei (rotten), 1 pull ringed, 2nd pull?
18-05-2023 nest: nest empty, no chicks found
27-05-2023 adult: partner 1: almost thayeri in right wing P10.
25-06-2023 pull r-7T flying around well, came to bread on the far side of dam 1