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

Home

Cachinnans - nest Lelystad 154

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 154 positioned on dam 1 western section. Most western nest for 2023.
  • ID certain in 2023: male parent is Caspian Gull, female parent is Herring Gull. Adult male Caspian Gull trapped at nest in 2023, now r[7.P].
partner 1 April 27th, 2023: adult male Caspian Gull r[7.P]. May 3rd, 2023: adult male Caspian Gull r[7.P] ringed. May 3rd, 2023: adult male Caspian Gull r[7.P] ringed.
 
pullus September 20th, 2023: pullus r[8.+] fledged. . .
     

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 teus 154-2023 74,6 51 97,70 70,6 51,9 95,75 55,2 50,5 70,88 264,33 NEW NEST
ring pulli: laying A egg: hatch A egg
 
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
adult 03-05-2023 6214907 r-7.P nn 449 137,2 62,2 21,3 7 male cachinnans.
pullus 18-05-2023 5556485 r-8.+ 124 56
pullus 27-05-2023 5556485 r-8.+ 329
   
154-2023 NEW NEST
dam: dam 1 west
location: most western nest selected in 2023 at dam 1.
breeders: cach x teus
OBSERVATIONS:
22-04-2023 nest: 3 eggs, water test: flat bottom - 3 times (recently laid).
27-04-2023 adult: Male cachinnans & female argenteus. Female breeding.
03-05-2023 adult: Trapped male cach at nest: r-7.P
13-05-2023 adult: Cachinnans r-7P guarding, female teus incubating.
18-05-2023 pullus: 1 chick ringed, other 2 not found
27-05-2023 pullus: 1x control chick.