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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Breeding species
Hybrid scores
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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

Argenteus - nest Lelystad 61Z

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 61Z positioned on dam 1 south section, cluster of nests also containing one cachinnans.
  • Nest included for "Herring Gull control nests".
  • ID uncertain in 2022: one parent is Herring Gull, partner unknown (but most likely also Herring Gull, we did not have another Caspian here, and several Herrings).
  • ID certain in 2023: both parents are Herring Gull argenteus.
location May 1st, 2022: nest location. April 27th, 2022: 3 eggs. .
   
partner 1 May 1st, 2022: partner 1 is argenteus. April 27th, 2022: partner 1 is argenteus. .
 
pullus May 17th, 2022: pullus metal ringed. May 17th, 2022: pullus r[6.G], sibling of r[6.F]. .
   
pullus May 27th, 2023: pullus g[8|+]. May 27th, 2023: pullus g[9|E]. May 27th, 2023: pullus g[9|F] (LBBG chick from neighbour).
 

Visits and data:
Estimation egg laying: A-egg = April 19 2022. Estimating hatching = May 17 2022.

date:              
15-04-2022 adult near empty nest.  
               
19-04-2022 2 adult Herring gulls present.  
               
  egg no: width (mm): length (mm): volume (cm3):       
27-04-2022 A 48,4 66 -- 35 - tip bottom 3 eggs  
  B 47,6 66,7 -- 80 - tip bottom  
C 48,6 66,9 -- 50 - 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 Herring Gull at nest.
   
04-05-2022 3 eggs.
   
09-05-2022 3 eggs.
   
17-05-2022 2 eggs.
A egg hatching, small hole.
C egg in tact,
B chick ringed, only metal ring.
   
  metal darvic mass H+B wing    
17-05-2022 .5625101 -- -- -- -- (chick just hatched, 1 day old)
           
22-05-2022 .5625101 r-6.G 186 62,6 38
22-05-2022 .5625159 r-6.F 114 57 33 chick near nest 61Z, but very likely (99%) from nest 123. >> see 123Z
22-05-2022 C egg still in nest (infertile). Chick rate: 1 out of 3 eggs.
   
  metal darvic mass H+B wing bill  
30-05-2022 .5625101 r-6.G 490 81 95 32
30-05-2022 .5625159 r-6.F 385 77,8 70 29
   
12-07-2022 picture of r[6.G].
 
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 61Z 67,3 49 81,36 -- -- -- -- -- -- 81,36 same as 2022
ring pulli: nn laying A egg: nn hatch A egg: nn
 
catch: date: metal: darvic: mass: wing: head+bill:
Pullus 27-5-2023 5.625.280 g-8|+ 210 -- teus in cluster van nesten.
Pullus 27-5-2023 5.625.282 g-9|F 218 -- KMM Observed it with 2 LBBG parents (positive interaction).
Pullus 27-5-2023 5.625.283 g-9|E 230 -- teus in cluster van nesten.
   
61Z Herring Gulls
dam: dam 1 west
location: Is in front of n[F|N]. Same as 61-2023.
breeders: teus x teus
OBSERVATIONS:
22-4-2023 nest 1 egg.
27-4-2023 adult: 2x Herring Gull partners.
13-5-2023 adult: 2x Herring Gull partners.
27-5-2023 pulli: 2x teus pulli ringed. Later a 3rd (g-9|F) pullus ringed at this very same location, believed to belong to 61 as well. But from boat we observed it with LBBG parents (positive interaction).