Larus cachinnans in the Netherlands

(last update: August 16, 2020)
Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse

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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 248

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 248 positioned on dam 2 west section: 22 mtr W of blue sign VHF20 and 22 mtr east of lighthouse. Between bushes, top of dam, visible from N side. Coded 248.
  • ID uncertain in 2023: oner parent is cachinnans, other parent unknown. Likely, both cachinnans.
  • ID uncertain in 2024: oner parent is cachinnans, other parent unknown. Likely, both cachinnans.
location April 9th, 2023: nest location dam 2. April 9th, 2023: full clutch, with 3 eggs. April 21st, 2024: full clutch, with 3 eggs.
 
partner 1 April 23rd, 2024: cachinnans. April 23rd, 2024: cachinnans. April 23rd, 2024: cachinnans.
 
partner 2 June 04 2024: adult Caspian Gull. June 04 2024: adult Caspian Gull. June 04 2024: adult Caspian Gull.
 
pullus July 8th, 2023: fledged r[7.0]. June 25th, 2023: fledged r[7.1]. June 18th, 2023: fledged r[7.Z].
 
pullus May 14th, 2024: chick g-B|C. May 14th, 2024: chick g-B|D. .
   
food May 7th, 2024: fish. May 7th, 2024: fish, Roach. May 14th, 2024: fish, Roach.
 

Data for nest 248-2023:

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 248-2023 71,2 52,5 98,81 71,2 51,7 95,82 72,5 51,3 96,07 290,70 No.
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 NLA 5625196 r 7.Z largest chick
Pullus 11-5-2023 NLA 5625197 r 7.0 smallest chick
Pullus 11-5-2023 NLA 5625198 r 7.1 middle chick
Pullus 18-6-2023 r-7Z
Pullus 18-6-2023 r-71
Pullus 18-6-2023 r-70
 
248-2023
dam: dam 2 west
location: 22 mtr W of blue sign VHF20 and 22 mtr east of lighthouse. Between bushes, top of dam, visible from N side. Coded 248
breeders: cach x cach
OBSERVATIONS:
04-04-2023 adult 1 cach at nest location.
09-04-2023 3 eggs. 3 eggs measured. No watertest, chick ringing in 1st session.
26-04-2023 3 eggs.
11-05-2023 3 pulli ringed
27-05-2023 nest empty, no chicks found.
18-06-2023 pulli r-70, r-71 & r-7Z have fledged.
25-06-2023 pulli r-70, r-71 & r-7Z present, all 3 chicks 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 73,3 52,2 100,56 72,8 52 99,11 71 50,2 90,09 289,77
248-2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 4-4-2024 2-5-2024
   
dam: dam 2 west
location: between lighthouse and blue sign, visible from north side. Sign: yellow helmet. Nest in line with 3 poles of nets.
parents? Same as 2023?
   
ring pulli: 6-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
07-05-2024 g-B|C .5631250 248 helmet PONT 1CY 89          
07-05-2024 g-B|D .5631151 248 helmet PONT 1CY 147          
14-05-2024 g-B|C .5631250 248 PONT 1CY 297   CONTROLL      
14-05-2024 g-B|D .5631151 248 PONT 1CY 394   CONTROLL      
04-06-2024 g-B|C .5631250 248 PONT 1CY 255 1049 115,4 CONTROLL      
                           
OBSERVATIONS:
21-04-2024 eggs: 3 eggs, measured.
02-05-2024 eggs: 2 eggs, 1x hatched halfway.
02-05-2024 chicks: 1 wet chick, hatched this morning.
07-05-2024 chicks: 2x ringed; 3rd chick not found. No eggs in nest.
  food: several fish species, including Roach.
14-05-2024 chicks: 2x ringed chicks CONTROLL
food:

3x Roach type.
04-06-2024 pullus: g-B|C present, measured.
food: 2x Silver Bream (Blicca bjoerkna), Dutch: Kolblei.
18-06-2024 chicks: g-B|C & g-B|D & unringed sibling present. Nest with 3 chicks.