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 026

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 026 positioned on blocks dam 1, far east (was 34-2021?). Cluster of Caspian Gull nests (With Lessies and Herrings) between blocks.
    In 2023 again a nest at this location, but parents not known.
  • ID certain in 2022: both cachinnans.
  • ID in 2023: unknown.
  • ID in 2024: at least one is Caspian Gull.
location April 15th, 2022: nest location. April 15th, 2022: 1 egg. May 17th, 2022: 1 egg infertile.
 
  April 21st, 2024: 3 eggs clutch, nest "Blue Bucket". April 21st, 2024: 3 eggs clutch. .
   
partner 1 April 27th, 2022: partner 1 is sub-ad cachinnans. April 27th, 2022: partner 1 is sub-ad cachinnans. April 19th, 2022: partner 1 is sub-ad cachinnans.
 
  April 23 2024: Caspian Gull (foreground = 34). May 14 2024: partner 1. .
   
partner 2 May 17th, 2022: partner 2 is female cachinnans. May 17th, 2022: partner 2 is female cachinnans. June 18th, 2024: partner 2 is female cachinnans.
 
pullus May 17th, 2022: 2 chicks ringed metal NLA. May 30th, 2022: pullus r-7E. May 30th, 2022: pullus r-7F.
 
pullus May 27th, 2023: pullus g-8|0. May 27th, 2023: pullus g-8|4. May 27th, 2023: pullus g-8|5.
 
chicks May 31 2024: chick g-C|4. May 31 2024: chick g-C|5. .
   
food May 30th, 2022: fish bolus. June 04 2024: fish bolus from g-C|5. .
   

Visits and data 2022 for nest 26:
Estimation egg laying: A-egg = April 15 2022. Estimating hatching = May 13 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):       
15-04-2022 A 48,7 72,0 --   1 egg.  
sub-adult Caspian near nest.
     
19-04-2022 sub-adult Caspian near nest.  
   
  egg no: 3 eggs.        
27-04-2022 A - - tip bottom - 90      
  B 49,6 70,2 tip bottom - 70    
C 50,0 72,5 tip bottom - 90
               
    metal          
17-05-2022 pullus 5625117 2 days old.        
  pullus 5625118          
1x egg: infertile.  
   
    metal colour mass wing head + bill Bill
30-05-2022 pullus 5625117 r-7.E 612 126 95,7 38,1
  pullus 5625118 r-7.F 522 96 88,2 36,6
1x egg: infertile.  
   
02-06-2022 r7E & r7F present.
   
17-06-2022 r7E & r7F present.
   
21-06-2022 r7E & r7F present
   
28-06-2022 r7E & r7F present
   
12-07-2022 r7E & r7F present
  Male cachinnans 4CY & female cachinnans.
 
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?
? X ? 26-2023 0 0 0,00 0 0 0,00 0 0 0,00 0,00 nn
ring pulli: -- laying A egg: -- hatch A egg: --
 
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 27-5-2023 5.625.275 g-8|0 136 -- --
Pullus 27-5-2023 5.625.276 g-8|5 209 -- --
Pullus 27-5-2023 5.625.277 g-8|4 225 -- --
 
26-2023
dam: dam 1 blocks
location: nest has now red spot, tree stem erected next to nest, which is approx 10 mtr east of nest P:U60, and 2 mtr west of code red R on block.
breeders: ? X ?
OBSERVATIONS:
27-5-2023 pulli: 3 chicks ringed and measured.

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:
  cach   71,1 47,7 81,45 74,3 49,1 90,19 73,6 49 88,98 260,62
026-2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 15-4-2024 10-5-2024
   
dam: dam 1 blocks
location: Was nest 26 at blocks east side, now Blue Bucket, 3 mtr SE of Roodflapje, top of dam 1
parents? New?
   
ring pulli: 14-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
14-05-2024 .5631189 26 blauwe emmer PONT 1CY 68          
14-05-2024 .5631190 26 blauwe emmer PONT 1CY 69          
31-05-2024 g-C|4 .5631189 26 PONT 1CY       CONTROLL      
31-05-2024 g-C|5 .5631190 26 PONT 1CY       CONTROLL      
04-06-2024 g-C|4 .5631189 26 PONT 1CY 173 653 94,9 CONTROLL      
04-06-2024 g-C|5 .5631190 26 PONT 1CY 175 738 98,0 CONTROLL      
                           
OBSERVATIONS:
21-04-2024 eggs: 3 eggs, measured. 
nest: Caspian Gull incubating.
07-05-2024 eggs: 3x.
14-05-2024 chicks: 2x ringed, only metal.
adult: Caspian Gull
eggs: 1x hatching
31-05-2024 chicks: 2x ringed, darvic added.
04-06-2024 chicks: g-C|4 & g-C|5 present, measured.
  food: fish bolus by g-C|5 when processed = Roach.
18-06-2024 chicks: g-C|4, g-C|5 present.
adults: 1x Caspian Gull.