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 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 244Z

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 244 positioned on dam 1 south section, 40 meters west of nest 118 (for 2022 is the most western nest).
  • ID uncertain in 2022: immature (5CY) cachinnans, other partner likely (99%) Herring Gull. Offspring 2022 clearly with strong Herring fenotypics.
  • ID uncertain in 2023: probably both parents are Herring Gull; one trapped ta nest now r-7.R.
location May 17th, 2022: code May 17th, 2023: 3 eggs. May 22nd, 2023: 3x metal ring.
 
parent 1 May 17th, 2022: sub-adult cachinnans May 17th, 2022: sub-adult cachinnans .
   
parent 2 November 12th, 2023: Herring Gull r-7.R. . .
     
pullus July 12th, 2022: fledged r[6.5]. May 30th, 2022: ringed pullus r[6.7]. September 24th, 2022: fledged r[6.8].
 
pullus May 27th, 2023: pullus g[9|C]. May 27th, 2023: pullus g[9|D]. .
   

Data for nest 244-2022:
Estimation egg laying: A-egg = April 22 2022. Estimating hatching = May 20 2022.

4-May-22 3 eggs A egg 65,4 51 floating - 4 mm
B egg 67,8 49 floating - 4 mm
C egg 63,4 47,6 floating - 4 mm
sub-adult cachinnans at this nest.
metal darvic mass wing H+B age
22-May-22 pullus .5625150 - 73 27 50,8 2 days, too small for darvic ring.
pullus .5625151 - 68 24 50,2 2 days, idem.
pullus .5625152 - 60 22 47 1st day, idem.
metal darvic mass wing H+B bill
30-May-22 pullus .5625150 r-68 267 45 67,6 26
pullus .5625151 r-67 258 46 68,1 24
pullus .5625152 r-65 244 38 63,6 23
02-Jun-22 probably Herring Gull at this nest? But be aware of other nest close by.
17-Jun-22 adult Herring Gull near nest.
21-Jun-22 pullus darvic mass H+B Bill Tarsus Wing
r-68 888 111 42,2 77,5 255
           
fledged: 2 or maybe even 3, at least r-65 and r-68 have fledged.
 
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?
teus x teus 244-2023 68,9 50,7 89,17 67,4 50,7 87,23 0 0 0,00 176,41 NEW NEST
ring pulli: laying A egg: hatch A egg
 
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
adult 03-05-2023 6.214.908 r-7.R nn 409 nn nn nn 5 female Herring Gull
pullus 27-05-2023 5.625.268 g-9|C 229
pullus 27-05-2023 5.625.284 g-9|D 260
pullus 18-06-2023 5.625.284 g-9|D 648 233 100,1
   
244-2023 NEW NEST
dam: dam 1 west
location: on tarmac. Code sprayed in red.
breeders: teus x teus
OBSERVATIONS:
22-04-2023 nest: 2 eieren in nest
03-05-2023 adult: Trapped female teus at nest: r-7.R
27-05-2023 pulli: 2x chicks ringed and measured.
18-06-2023 pulli: control of g-9|D.

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:
244-2024 teus teus 70,6 48,4 83,27 68,5 47,7 78,47 65,6 49 79,30 241,05
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3    
   
dam: dam 1 south
location: dam 1 western section, nest 244-2023, 55 mtr south of n-F|N.
parents? same as 2023?
   
ring pulli: June 03?
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
                           
OBSERVATIONS:
05-05-2024 eggs 3x, measured.