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 g-A|J (206, was y-X56A in 2022)

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 206 positioned on dam 2, 8 meters west of blue sign VHF20.
  • ID certain in 2022: both cachinnans. One is female German ringed y-X56A. Y-X56A will move to nest 229 in season 2023 (few meters to the west).
  • ID uncertain in 2023: one parent is certianly cachinnans, other partner limited proof.
  • ID in 2024: Caspian Gulls.
location April 29th, 2022: nest location. April 9th, 2023: nest with 3 eggs. April 21st, 2024: location of nest.
 
eggs April 15th, 2022: 2 eggs. May 9th, 2022: 3 eggs. Hatching day. April 9th, 2023: full clutch: 3 eggs.
 
. April 21st, 2024: full clutch, with 3 eggs. . .
     
partner 1 April 29th, 2022: y-X56A is cachinnans. April 11th, 2022: y-X56A is cachinnans. April 29th, 2022: partner 1 y-X56A is cachinnans.
 
partnber 1 April 23rd, 2024: adult cachinnans. April 23rd, 2024: adult cachinnans. April 30 2024: female cachinnans trapped: g-A|J.
 
partner 2 April 29th, 2022: partner 2 is cachinnans. April 29th, 2022: partner 2 is cachinnans. April 29th, 2022: partner 2 is cachinnans with broad medial band on P10.
 
partner 2 April 4th, 2023: adult Caspian Gull. . .
     
pullus June 28th, 2022: r-5.3 fledged. June 28th, 2022: r-5.4 fledged. June 28th, 2022: r-5.5 fledged.
 
pullus October 20th, 2023: r-7.W fledged. October 20th, 2023: r-7.X fledged. May 14 2024: pullus g-B|Y.
 
pullus May 14 2024: pullus g-B|Z. . .
     

Visits and data.

visits in 2022:        
11-04-2022 yellow ring at this location, can it be y-X56A?
   
12-04-2022 2 adults near nest.
             
  egg no: width (mm): length (mm): volume (cm3):     
15-04-2022 A 52,2 74,5 -- 20 - tip bottom 3 eggs
  B 52,7 74,2   10 - tip bottom  
sum nest: --
   
19-04-2022 2 adults near nest.  
   
  egg no:     3 eggs, 2 adults (incl y-X56A).  
29-04-2022 A float - 3 mm        
  B float - 2 mm        
C float - halfway    
   
09-05-2022 3 eggs. Hatching day for B egg. Small hole in egg.
   
  metal colour mass      
17-05-2022 .5625139 r-54 251      
  .5625140 r-55 181      
.5625141 r-53 225  
   
02-06-2022 adult y-X56A present on bread.
   
17-06-2022 r-55 flying around; parent y-X56A ferociously protect the chick.
   
21-06-2022 adult y-X56A present. Chicks r-53, r-54, r-55 swimming around.
  food: we catch r-55, throws up fish food.
   
28-06-2022 adult y-X56A present. Chicks r-53 & r-55 photographed.
   
12-07-2022 Chick r-55 photographed.
 
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 206 71,3 50,5 91,55 67,3 51,3 89,18 67 48,8 80,34 261,07 one is same as 2022
ring pulli: May 10 laying A egg: April 05 hatch A egg: May 03
     
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
Pullus 11-5-2023 NLA5625194 r 7.W
Pullus 11-5-2023 NLA5625195 r 7.X
Pullus 18-6-2023 r-7X
Pullus 18-6-2023 r-7W
   
206 (was X56A)
dam: dam 2 west
location: 8 mtr W of blue sign VHF20, south side, on blocks
breeders: cach x cach
OBSERVATIONS:
26-4-2023 nest: 3 eggs.
27-4-2023 y-X56A is NOT the parent (27/4 confirmed).
27-4-2023 3 eggs measured. Watertest C-egg: 20 - tip bottom
11-5-2023 pull: 2 kuikens geringd, 3e kuiken?
11-5-2023 r-7X: baars en voorn uitgebraakt
18-5-2023 nest: nest empty, no chicks found
27-mei nest: nest empty, no chicks found
18-6-2023 pull: r-7X & r-7W present, 2 birds fledged.
25-6-2023 pull: r-7X and r-7W present, 2 birds 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:
g-A|J (206) cach cach 66,5 51 87,09 70,3 50,7 90,99 70,3 48,3 82,58 260,65
2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 15-4-2024 13-5-2024
   
dam: dam 2 west
location: 8 mtr SW of Blue sign, was 206-2023/2022.
parents? Same as 2023?
   
ring pulli: 18-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
30-04-2024 g-A|J .5631207 Dam 2 PONT F >4CY 439 919 122,0 53,1 67,0 18,5 5
14-05-2024 g-B|Y .5631176 nest 206 PONT 1CY 156          
14-05-2024 g-B|Z .5631177 nest 206 PONT 1CY 96          
04-06-2024 g-B|Y .5631176 nest 206 PONT 1CY 198 799 102,0        
                           
OBSERVATIONS:
12-04-2024 nest ready, but still empty
21-04-2024 eggs: 3 eggs, measured.
adult: 2x unringed cachinnans.
30-04-2024 adults: trapped female Caspian Gull, now g-A|J.
02-05-2024 eggs: 3 eggs.
07-05-2024 eggs: 3x.
14-05-2024 chicks: 2x ringed and measured.
04-06-2024 pullus: g-B|Y present, measured.
adult: 1x present.
18-06-2024 chick: trapped g-B|Y at water.