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

Herring Gull argenteus 6.F 1CY, May 22 2022, Lelystad, the Netherlands. Picture: Jeroen Nagtegaal & Mars Muusse.

Red tibia ring r[6.F] and metal NLA 5.625.159, ringed as pullus Larus argentatus at nest 61Z on May 22 2022 in colony Lelystad, the Netherlands. Ringer: Jeroen Nagtegaal.
ID uncertain in 2022: one parent is Herring Gull, partner unknown (but most likely also Herring Gull). Nest included for "Herring Gull control nests".
Nest 61Z started with 3 eggs, 2 chicks ringed.

r[6.F] argenteus probably from nest 123Z, but in 61Z. Picture: May 22nd, 2022.

Visits and data nest 61Z:
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].

nest 123Z:

date:              
  egg no: width (mm): length (mm): volume (cm3):  water test    
27-04-2022 A-egg 44,8 72,3 -- 40 - tip on bottom    
  B-egg 46,1 62   20 - tip on bottom  
  C-egg 44,3 67,7 -- 20 - tip on bottom
sum nest: --
04-05-2022 3 eggs
09-05-2022 3 eggs
17-05-2022 3 eggs      
22-05-2022   metal darvic mass wing H+B
pullus NLA 5.625.157 r-6.D 90 30 53,4
pullus NLA 5.625.158 r-6.E 87 29 52,6
pullus NLA 5.625.159 r-6.F 114 33 57 (potentially chick from nest 61Z, found it that shrub)
    metal darvic mass wing H+B Bill
30-05-2022 pullus NLA 5.625.159 r-6.F 385 70 77,8 29,0
12-07-2022 pullus NLA 5.625.158 r-6.E picture

r[6.F] argenteus from nest 123. Pictures: May 22nd & 30th, 2022.
Ringed on May 22nd. Obsercved again on May 30th, no observations since. Same for sibling r[6.D]. Sibling r[6.E] fledged.

below: Herring Gull argenteus 6.F 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

below: Herring Gull argenteus 6.F 1CY, May 22 2022, Lelystad, the Netherlands. Picture: Jeroen Nagtegaal & Mars Muusse.