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 112

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 112 positioned on dam 1, just east of bend, 25 mtr west of PNED.
  • ID certain in 2022: parents are male Caspian Gull type (short tongue on P10 may indicate hybrid, otherwise nice cachinnans) and female Caspian Gull.
  • ID certain in 2023: male Caspian Gull same as 2022, female is Caspian Gull thayeri (formerly nest 29-2020, 29-2021, 135-2022).
  • ID certain in 2024: male Caspian Gull same as 2022, female is Caspian Gull thayeri (formerly nest 29-2020, 29-2021, 135-2022).
location April 27th, 2022: nest location. April 27th, 2022: 3 eggs. April 26th, 2023: 3 eggs.
 
location April 26th, 2023: 3 eggs. April 12th, 2024: 1 egg. April 21st, 2024: full clutch, with 3 eggs.
 
partner 1 May 1st, 2022: partner 1 is cachinnans. May 13th, 2023: female is cachinnans 'thayeri'. May 13th, 2023: female is cachinnans 'thayeri'.
 
partner 1 April 30th, 2024: female cachinnans 'thayeri'. April 30th, 2024: female cachinnans 'thayeri'. April 30th, 2024: female cachinnans 'thayeri'.
 
partner 2 April 27th, 2022: partner 2 is cachinnans type. April 27th, 2022: partner 2 is cachinnans type. May 4th, 2022: partner 2 is cachinnans type.
 
partner 2 April 26th, 2023: male cachinnans type. May 13th, 2023: male cachinnans type with partner. April 21st, 2024: male cachinnans type.
 
partner 2 April 21st, 2024: male cachinnans type. April 21st, 2024: male cachinnans type. .
   
pullus May 9th, 2022: pullus r[C.F]. May 17th, 2022: pullus r[5.W]. May 17th, 2022: pullus r[5.X].
 
pullus July 18th, 2023: juvenile g[7|R]. July 8th, 2023: juvenile g[7|S]. October 10th, 2023: juvenile g[8|Z].
 
pullus May 14 2024: g-B|5. May 14 2024: g-B|6. .
   

Visits and data 2022 for nest 112:
Estimation egg laying: A-egg = April 3 2022. Estimating hatching = May 1 2022.

date:              
12-04-2022 adult near nest.  
               
  egg no: width (mm): length (mm): volume (cm3):       
15-04-2022 A 50,5 72,5 -- 50 - tip bottom 3 eggs  
  B 48,3 64,9 -- 70 - tip bottom  
C 51 71,7 -- 90 - tip bottom
sum nest: --
   
  egg no:     3 eggs, 1 adult has short white tongue on P10: hybrid?    
29-04-2022 A float - 4 mm          
  B float - 4 mm        
C float - 5 mm    
   
01-05-2022 Cach and hybrid type at nest.
   
04-05-2022 Cach at nest.
   
  metal darvic mass H+B      
09-05-2022 .5625057 r-C.F -- --
17-05-2022 .5625121 r-5W 515 85,9
17-05-2022 .5625122 r-5X 618 94,9
17-06-2022 No activity.
21-06-2022 No activity.
28-06-2022 r-CF 7 r-5W pictures. All chicks fledged: 3 out of 3.
 
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 112-2023 74,6 51,7 100,40 74,2 51 97,17 71,2 50,2 90,34 287,91 same as 2022
ring pulli: May 09. laying A egg: April 06. hatch A egg: May 04.
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 18-5-2023 5556407 G-7|R 123 59,6
Pullus 18-5-2023 5556408 G-7|S 84 53
Pullus 27-5-2023 5.556.407 g-7|R 382
Pullus 27-5-2023 5.625.270 G-8|Z 538
 
112-2023
dam: dam 1 east
location: Top of dam. On S-side: red/white traffic sign, nest 111 is just west of it. Same nest as 111-2022
breeders: cach x cach
OBSERVATIONS:
09-4-2023 adult: Unringed cach present at location. So search for nest today.
26-4-2023 adult: Unringed cach present at location.
nest: Almost within Elder (vliertje), old red spot visible. Yellow/black flag in Elder. Top of dam, 25 m W of 19.
eggs: 3x egg, measured. A 90 - tip bottom
B 90 - tip bottom
C 80 - tip bottom
11-5-2023 eggs: 3 eggs
13-5-2023 adult: female = cach thayeri. Male is Caspian too.
18-5-2023 pulli: 2 chicks ringed, 3rd not found
27-5-2023 pulli: 3rd chick ringed today, near waterfront at S-side.
18-6-2023 pulli: g-7|S at waterfront.
25-6-2023 adult: thayeri and all 3 chicks present, 3x 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 71,2 52,4 98,43 73,8 52 100,48 73,8 52,6 102,81 301,72
112-2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 11-4-2024 7-5-2024
   
dam: dam 1 east
location: Near waterfront on south side. Red/white traffic sign, nest 112 is just east of it.
parents? same as 2023?
   
ring pulli: 11-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
14-05-2024 g-B|5 .5631186 nest 112 PONT 1CY 147          
14-05-2024 g-B|6 .5631187 nest 112 PONT 1CY 111          
                           
OBSERVATIONS:
12-04-2024 eggs: 1 egg, measured. 
21-04-2024 adult: thayeri is one cach, male is cach-type (slightly broad medial band P10).
21-04-2024 eggs: 3 eggs, not measured. 
07-05-2024 eggs: 3x.
14-05-2024 chicks: 2x ringed.
  eggs: 1x in nest, warm, and no cracks.
  food: little Perches (baarsjes).
04-06-2024 nest: No chick found. Nest failed. New nest started 2 mtr westwards, already with 2 eggs. Eggs measured.
  Blue egg: 70,1 x 50,4
  Brown egg: 74,0 x 50,7