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

Lelystad 2023:
nest y-PNED
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X60J
nest y-XCHP
nest w-327:U
nest n-F|6
nest n-F|8
nest n-F|+
nest n-F|N
nest r-6.B
nest r-7.P
nest r-C.G
nest w-8Z
nest 003
nest 006
nest 013
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 033
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 108
nest 109
nest 111
nest 112
nest 127Z
nest 131Z
nest 132 YLG
nest 135
nest 139
nest 147Z
nest 163
nest 167
nest 168
nest 204
nest 206
nest 207
nest 223
nest 227
nest 230Z
nest 231
nest 244Z
nest 245Z
nest 248
nest 251
nest 252
nest 253
nest 254
nest 255Z
nest 256Z
nest 262

Cachinnans - nest Lelystad 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.
 
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. .
   

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:
  cach cach 66,5 51 87,09 70,3 50,7 90,99 70,3 48,3 82,58 260,65
206-2024 # 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
                           
OBSERVATIONS:
12-4-2024 nest ready, but still empty
21-4-2024 eggs: 3 eggs, measured.
adult: 2x unringed cachinnans.