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

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Cachinnans - nest Lelystad n-F|+

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 n-F|+ positioned on dam 2: east at blocks, 15 mtr W of y-XCHP, low at dam 2.
  • ID certain in 2023: male is 4CY n-F|+ and partner is sub-adult female cachinnans.
location April 27 2023: 3 eggs. April 27 2023: nest at dam 2. .
   
partner 1 April 09 2023: n-F|+. April 09 2023: n-F|+. April 09 2023: n-F|+.
 
partner 2 May 13 2023: Caspian Gull. May 13 2023: Caspian Gull. May 13 2023: Caspian Gull.
 

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 cach n-F|+ 2023 69,3 46,6 75,77 67,4 47,1 75,28 67,3 47 74,85 225,91 new nest
ring pulli: May 18 laying A egg: April 13 hatch A egg: May 11
   
n-F|+ 2023 New nest
dam: dam 2 east, blacks
location: 20 mtr SW of nest 55, 15 mtr W of XCHP, low at dam 2. In front of wood. Red spot sprayed.
breeders: cach x cach
OBSERVATIONS:
27-04-2023 nest: 3 eggs measured. Water test. A: 90 - tip bottom
adult: breeding adult cachinnans is n[F|+]. B: 60 - tip bottom
30-04-2023 adult: partner is also cachinnans. C: 80 - tip bottom
n-F|+ at nest.
13-05-2023 adult: n-[F|+] & partner are immatures.
18-05-2023 nest: 1 egg hatching, no chicks found
27-05-2023 pulli: 1x chick dead in nest, age 1 day. No other chicks found. Several dead chicks in this section (55, XCHP, n-F|+).
25-06-2023 adult: not present, no birds here.