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 251

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 251 positioned on dam 2 west section: 1 mtr N blue sign VHF20, 2 mtr behind "the white buoy". Could be parents nest 12-2020/2022.
  • ID uncertain in 2023: one parent is cachinnans, other parent unknown. Likely both cachinnans, but, might be Herring blood involved, as the chicks show intermediate traits.
  • ID certain in 2024. Female cachinnans is same as in 2023. Male is also cachinnans.
location April 9th, 2023: nest location dam 2. April 9th, 2023: full clutch, with 3 eggs. April 21st, 2024: full clutch, with 3 eggs.
 
partner 1 April 27th, 2023: breeding adult cachinnans. April 27th, 2023: adult cachinnans. .
   
partner 1 April 23rd, 2024: female cachinnans. April 23rd, 2024: female cachinnans. April 23rd, 2024: female cachinnans.
 
partner 2 April 23rd, 2024: male cachinnans. April 23rd, 2024: male cachinnans. April 23rd, 2024: male cachinnans.
 
  April 23rd, 2024: male cachinnans. . .
     
pullus November 29th, 2023: fledged r[7.U]. June 25th, 2023: fledged g[7|V]. .
   
pullus June 18th, 2024: chick g-A|=. May 7th, 2024: chick g-B|A. May 7th, 2024: chick g-B|B.
 

Data for nest 251-2023:

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 251-2023 70,7 50 88,99 68,1 51,4 90,59 67,7 49,1 82,18 261,76 was 12-2022???
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 5.625.193 r-7.U 315 75.0 75.0 two other chicks? Chicks not found
Pullus 18-5-2023 5.556.411 g-7|V 490 86,3 86,3
Pullus 18-5-2023 5.625.193 r-7U not measured, but was present.
Pullus 27-5-2023 5.625.193 r-7U 896
Pullus 18-6-2023 5.625.193 r-7U
Pullus 18-6-2023 5.556.411 g-7|V
   
251-2023 nest "White Buoy".
dam: dam 2 west
location: 1 mtr N blue sign VHF20, 2 mtr behind of white buoy. Could be parents nest 12-2020/2022. Parents guarding from VHF20?
breeders: cach x cach
OBSERVATIONS:
09-4-2023 nest: 3 eggs measured. Watertest C-egg: 35 - tip bottom
27-4-2023 adult: breeding adult cach.
11-5-2023 pulli: 1 chick ringed r-7U, 2 more chicks?
18-5-2023 pulli: 2 chicks present. 1 ringed (R-7U), other unringed. The unringed one is now ringed today g-7|V.
27-5-2023 pulli: 1x chick measured, r-7U.
18-6-2023 pulli: g-7|V and r-7U together.
25-6-2023 pulli: G-7|V and r-7U together: 2 chicks fledged from this nest.

Visits and data 2024.

NEST code parent 1 parent  2 A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST:
  70,7 50,7 91,50 69 51 90,36 69,3 47,3 78,06 259,93
251-2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 17-4-2024 15-5-2024
   
dam: dam 2 west
location: Ariel / white Buoy, 4 mtr north of Blue sign
parents? Same as 2023?
   
ring pulli: 20-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
07-05-2024 g-A|= 5.631.244 251 Ariel PONT 1CY 71          
07-05-2024 g-B|A 5.631.245 251 Ariel PONT 1CY 81          
07-05-2024 g-B|B 5.631.246 251 Ariel PONT 1CY 82          
                           
OBSERVATIONS:
21-04-2024 eggs: 3 eggs, measured.
02-05-2024 eggs: 3 eggs.
07-05-2024 chicks: 3x ringed.
18-06-2024 chick: CONTROLL: g-B|B and g-A|= at water.