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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Breeding biology
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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 132

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 132 positioned on dam 1 blocks T-split, between nest 53 and nest yPU60.
  • ID uncertain in 2022: one adult is Yellow-legged Gull michahellis. Most likely, partner is female Herring Gull argenteus g-97.
  • ID uncertain in 2023: again the Yellow-legged Gull michahellis. Partner unknown.
location April 27th, 2022: location of nest. April 27th, 2022: 3 eggs. May 30th, 2022: situation at nest.
 
nest: April 26th, 2023: nest location with 2 eggs. April 26th, 2023: 2 eggs. April 26th, 2023: 2 eggs.
 
partner 1: May 30th, 2022: adult michahellis at nest. May 30th, 2022: adult michahellis at nest. June 21st, 2022: adult michahellis.
 
partner 1: May 13th, 2023: adult michahellis at nest. May 13th, 2023: adult michahellis at nest. .
   
pullus: May 30th, 2022 pullus r[7.K]. June 21st, 2022 pullus r[7.K]: fledged. May 27th, 2023 pullus NLA 5.625.271 (only metal).
 

Data for nest 132-2022:
Estimation egg laying: A-egg = April 23 2022. Estimating hatching = May 21 2022.

27-Apr-22 3 eggs A egg 69,5 50,9 tip bottom - 20 gr
B egg 68,7 49,8 tip bottom - 20 gr
C egg 64,1 48,7 flat
   
17-May-22 3 eggs
         
metal darvic mass wing H+B Bill
30-May-22 pullus 5625189 r-7.K 280 46 68 25,2
adult: michahellis present between many LBBG. Micha next to the chick.
   
21-Jun-22 adult: michahellis present but also Herring Gull g[97]!!!
   
12-Jul-22 adult: michahellis present but also Herring Gull g[97],
and chick r[7K].
 
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?
micha x teus? 132-2023 70 47,9 80,87 69 48 80,04 0 0 0,00 160,91 same as 2022?
ring pulli: laying A egg: hatch A egg
 
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 27-5-2023 5.625.272 132 code at white code 132 (3 mtr E of red dot 132): 3x only metal: NLA 5625272, 273, 274
Pullus 27-5-2023 5.625.273 132 code at white code 132 (3 mtr E of red dot 132): 3x only metal: NLA 5625272, 273, 274
Pullus 27-5-2023 5.625.274 132 code at white code 132 (3 mtr E of red dot 132): 3x only metal: NLA 5625272, 273, 274
Pullus 27-5-2023 5.625.271 132 red dot red dot (3 mtr W of code 132): 1x egg, 1x tiny one, hatched today, 1x metal NLA 5625271
Pullus 18-6-2023 5625273 649 98,8 LBBG type, seemingly no micha-hybrid
Pullus 18-6-2023 5625272 366 87,1 LBBG type, seemingly no micha-hybrid
   
132-2023 see also: 129.
dam: dam 1 blokken
location: is nest 132-2022, michahellis nest.
breeders: micha x teus?
OBSERVATIONS:
26-04-2023 adult: michahellis landed next to red spot.
nest: 1 m East of red spot, nest with 2 eggs.
eggs: 2x egg, measured. No water test.
11-05-2023 eggs: 3 eggs
13-05-2023 adult: michahellis.
27-05-2023 nest: At nest 132 red spot, 1x metal. 
At nest 132 digits, 3x metal.
18-06-2023 nest: In retrospect: the nest of michahellis must have been with chick NLA 5.625.271.