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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Nests at Lelystad 2022
nest y-PNED
nest y-PHSV / r-CG
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X540
nest y-XCHP
nest w-327:U
nest n-F|N
nest r-6A
nest r-6B
nest r-6C
nest r-CS
nest r-FC
nest w-8Z
nest zy-MT
nest 003
nest 011
nest 012
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 058
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 109
nest 111
nest 112
nest 113
nest 117Z
nest 118Z
nest 123Z
nest 124Z
nest 125Z
nest 126Z
nest 127Z
nest 128Z
nest 129Z
nest 131Z
nest 132 YLG
nest 133
nest 134
nest 135
nest 136
nest 137
nest 138
nest 139
nest 143Z
nest 203
nest 204
nest 207
nest 222Z
nest 227
nest 228Z
nest 229
nest 230Z
nest 231
nest 240Z
nest 244
nest 245Z

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.
location April 15th, 2022: nest location. April 15th, 2022: 1 egg. May 17th, 2022: 1 egg infertile.
 
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.
 
partner 2 May 17th, 2022: partner 2 is female cachinnans. May 17th, 2022: 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.
 
food May 30th, 2022: fish bolus. . .
     

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.