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 r-C.S (108)

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).
  • In 2022 nest s108 positioned on dam 1 at T split; 10 meters from nest 21.
  • ID certain in 2022: both immature (4CY) cachinnans, one trapped at the nest and ringed r[C.S].
  • ID certain in 2023: both are cachinnans, but partner 1 is not r[C.S].
  • ID certain in 2024: both are same cachinnans: partner 1 is r[C.S] again, male is now 6CY cachinnans.
location April 27th, 2022: location of nest. April 15th, 2022: location of nest. April 26th, 2023: 3 eggs.
 
  April 12th, 2024: 2 eggs. April 21st, 2024: 3 eggs clutch. .
   
nest April 15th, 2022: 1 egg. April 9th, 2023: 2 eggs. April 26th, 2023: 3 eggs.
 
  April 12th, 2024: 2 eggs. April 21st, 2024: 3 eggs clutch. .
   
partner 1 May 9th, 2022 4CY cachinnans r-C.S. May 9th, 2022 4CY cachinnans r-C.S. May 9th, 2022 4CY cachinnans r-C.S.
 
  March 08 2024: r-CS. March 19 2024: r-CS & male partner. .
   
partner 2 May 4th, 2022 4CY cachinnans. May 4th, 2022 4CY cachinnans. .
   
partner 2 April 27th, 2023: 5CY male cachinnans. April 27th, 2023: 5CY male cachinnans. April 27th, 2023: 5CY male cachinnans.
 
partner 2 April 23rd, 2024: 6CY male cachinnans. April 23rd, 2024: 6CY male cachinnans. April 23rd, 2024: 6CY male cachinnans.
 
partner 2 April 23rd, 2024: 6CY male cachinnans. April 23rd, 2024: 6CY male cachinnans. April 23rd, 2024: 6CY male cachinnans.
 
pullus May 17th, 2022 pullus r[5.G]. May 17th, 2022 pullus r[5.H]. June 18th, 2023: juvenile r[8.P] & r[8.4].
 
pullus May 11th, 2023: pullus r[8.V]. July 8th, 2023: pullus r[8.P]. July 8th, 2023: pullus r[8.4].
 
pullus June 4th, 2024: pullus g-C|S. June 4th, 2024: pullus g-C|A. .
   
prey May 17th, 2022 prey is Eel (50 cm). May 17th, 2022 prey is Roach (in mm). .
   

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

date:              
11-04-2022 nest ready. Still empty.
   
12-04-2022 2 birds at nest site.
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
15-04-2022 A 48,1 70,9 -- --    
27-04-2022 A       float - 1 mm  
27-04-2022 B 67,9 47,7 -- 80 - tip on bottom
sum nest: --
   
04-05-2022 4CY at nest.
   
09-05-2022 4CY trapped at nest. Ring metal = NLA 5.625.067.
darvic gonys wing tarsus head+bill bill mass
r[C.S] 18,0 446 69,2 127,2 59,1 1025 gr.
17-05-2022   metal darvic mass
pullus NLA 5.625.106 r[5.G] 151
pullus NLA 5.625.107 r[5.H] 89
prey Roach & Eel (50 cm).
 
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 nest 108 74 49,7 92,03 68,2 49,8 85,16 69,7 48,6 82,89 260,08 same as 2022
ring pulli: 12-mei laying A egg: 7-april hatch A egg: 5-mei
     
catch: date: metal: darvic:            
pull 11-05-2023 NLA 5.556.472 r 8.P
pull 11-05-2023 NLA 5.556.473 r 8.V
pull 11-05-2023 NLA 5.556.474 r 8.4
pull 18-06-2023 NLA 5.556.472 r-8.P
pull 18-06-2023 NLA 5.556.474 r-8.4
nest 108
dam: dam 1 T-split
location: on W-part, border bitumen - blocks. Top of dam. Coded. Exact spot as in 2022, then r[C.S] (which was at almere dump + partner, on 23/4).
breeders: cach x cach
OBSERVATIONS:
09-04-2023 nest:  2 eggs measured. No watertest.
adult:  1x cachinnans unringed. Still not sure if r-CS is partner this season.
26-04-2023 adult: legs not visible. 
nest: 1,5 m NW is another nest, 2 eggs. LBBG? (on 27/4: yes, this is LBBG).
eggs: 3x egg, measured. No water test, ringing date known.
27-04-2023 adult: 5CY male cach. Unringed.
11-05-2023 pulli: 3 chicks ringed.
13-05-2023 adult partner 1 present.
18-06-2023 pulli: r-8P and r-84 present. Large chicks. 2x juveniles fledged.
25-06-2023 pulli: r-8P present, other ring unreadable, probably r-8.4.

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:
r-C.S 2024 cach cach 74,6 50,1 94,28 72,1 49,8 90,03 71,1 50,3 90,57 274,88
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 10-4-2024 6-5-2024
   
dam: dam 1 T-split
location: Like 2023: on W-part, border bitumen - blocks. Visible from north side. Moved 2 mtr north, compared to 2023.
parents? R-CS is back, and with partner 2022?
   
ring pulli: 11-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
14-05-2024 g-C|S .5631197 nest r-CS / 108 PONT 1CY 252          
14-05-2024 g-C|A .5631198 nest r-CS / 108 PONT 1CY 183          
04-06-2024 g-C|S .5631197 nest r-CS / 108 PONT 1CY 235 610 103,9        
04-06-2024 g-C|A .5631198 nest r-CS / 108 PONT 1CY 221 778 105,7        
                           
OBSERVATIONS:
12-04-2024 eggs: 2 eggs, measured.
21-04-2024 eggs: 3 eggs, measured.
nest: orange safety ring added
23-04-2024 adults: present are r-CS and brutal male partner cachinnans with yellow legs.
07-05-2024 eggs: 1x hatching.
  chicks: 2x wet chicks, not ringed.
14-05-2024 chicks: 2x ringed, 3rd chick not found.
04-06-2024 chick: g-C|A & g-C|S present. measured.