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 107Z

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 107Z positioned on dam 1 south, 50 meters west of nest y-PHSV. Part of "control group Herring Gulls".
  • ID certain in 2022: both adults are Herring Gull. Early breeder, at Blackberry complex. same nest as in 2021, then not monitored as Herring Gull. Now in control group.
  • ID in 2023 certain: again Herring Gulls at nest. Trapped one adult in May 2023, now r-F.8.
location April 15th, 2022: location of nest. April 19th, 2022: location of nest. April 15th, 2022: 1 egg.
 
  April 27th, 2022: 3 eggs. May 17th, 2022: unfertile egg & Roach-type fish. .
   

Visits and data:
Estimation egg laying: A-egg = April 15 2022. Estimating hatching = May 13 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):  water test    
15-04-2022 A-egg 52,7 71,5 -- -- not tested. Like last year 2021, again an early Herring nest.
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
27-04-2022 A-egg -- -- -- 1 mm - floating  
  B-egg 51,6 71,7   1 mm - floating
  C-egg 48,3 67,8 -- 90 gr - tip bottom
sum nest: --
     
09-05-2022 3 eggs
       
17-05-2022 1 egg unfertile: C-egg
  no chicks found in large Blackberry complex.
food: fishes = Roach-type  
       
22-05-2022 unfertile C-egg removed.
  no chicks found in large Blackberry complex.
   
02-06-2022 abandoned?
 
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?
teus x teus nest 107 -- -- -- -- -- -- -- -- -- -- same as 2022
ring pulli: laying A egg: hatch A egg
 
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
teus 03-05-2023 6214902 r-F8 650? 428 114,4 66,8 19,4 nn Herring Gull
   
nest 107 same 2021-22
dam: dam 1 south
location: 30 mtr east of nest 60 cluster
breeders: teus x teus
OBSERVATIONS:
22-04-2023 nest: empty.
03-05-2023 adult:  trapped adult Herring Gull at nest. Now r-F.8.
03-05-2023 nest: 3 eggs.