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 167

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 167 positioned on section "dam 1 blocks", just 2,5 meters south of nest y-P:U60. Nest visible from south side. Discovered late in season.
  • ID certain in 2023: both parents are adult Caspian Gull cachinnans.
  • ID uncertain in 2024: one parent is adult Caspian Gull cachinnans. Other unknown, but likely Caspian.
nest May 13th, 2023: 2 eggs & 1 chick hatching. April 12th, 2024: 3 eggs clutch. May 31st, 2024: nest 167.
 
partner 1 May 13th, 2023: adult cachinnans. May 13th, 2023: adult cachinnans. May 13th, 2023: adult cachinnans.
 
partner 1 May 13th, 2023: adult cachinnans. June 04 2024: 2 parents at nest. .
   
partner 2 May 13th, 2023: adult cachinnans. May 13th, 2023: adult cachinnans. May 13th, 2023: adult cachinnans.
 
partner 2 May 13th, 2023: sub-adult cachinnans. May 05 2024: adult cachinnans. .
   
pullus June 25th, 2023: juvenile g[7|E]. June 25th, 2023: juvenile g[7|F]. .
   
pullus May 7th, 2024: chick g-A|4. May 31 2024: chick g-A|5. June 18th, 2024: chick g-A|7.
 

Visits and data:

egg sizes & volume 2023
SPECIES NEST  
cach x cach 167-2023
ring pulli: May 18th.
 
catch: date: metal: darvic: mass: wing: head+bill:
pullus 18-5-2023 5556497 G-7|E 167 60,5
pullus 18-5-2023 5556498 G-7|F 123 56,4
pullus 18-6-2023 g-7|E
pullus 18-6-2023 g-7|F
   
167-2023 NEW NEST
dam: dam 1 
location: Blocks dam 1 - 2,5 mtr SW of PU60. Visible from South.
breeders: cach x cach
OBSERVATIONS:
13-05-2023 eggs 1 egg, 1 egg hatching, 1 small pullus
13-05-2023 adult partner 2 = partner 1 nest 26-2022, that time 4cy cach.
18-05-2023 pulli: 2 chicks ringed, 3rd dead in nest
18-06-2023 adult partner 1 with chicks.
18-06-2023 pulli: both chicks g-7|E & g-7|F present.
25-06-2023 pulli: both chicks g-7|E & g-7|F present. Two chicks fledged.

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:
167-2024 cach 77,3 53 109,33 76,5 52,6 106,57 74,3 52,3 102,33 318,22
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 8-4-2024 3-5-2024
   
dam: dam 1 blocks
location: Blocks dam 1 - 2,5 mtr SW of PU60. Visible from South.
parents? same as 2023?
   
ring pulli: 09-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
07-05-2024 g-A|4 .5631238 167 PONT 1CY 150          
07-05-2024 g-A|5 .5631239 167 PONT 1CY 160          
07-05-2024 g-A|7 .5631240 167 PONT 1CY 162          
04-06-2024 g-A|4 .5631238 167 PONT 1CY 291 1007 113,2        
                           
OBSERVATIONS:
12-04-2024 eggs: 3 eggs, measured. Long, and brown.
21-04-2024 eggs: 3 eggs, not measured.
07-05-2024 chicks: 3x ringed.
17-05-2024 chicks: g-A|7 with parent Caspian Gull.
31-05-2024 chicks: 3x chicks & parents Caspian Gulls.
04-06-2024 chicks: g-A|4 present, measured. Also present: g-A|5.
  adult: 2x Caspian Gull present.
18-06-2024 chick: CONTROLL: g-A|7 at water, g-A|4 & g-A|5 at nest site.