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

Caspian Gull cachinnans C.X 1CY, May 09 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[C.X] and metal NLA 5.625.073, ringed as pullus Larus cachinnans at nest 17 on May 09 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID uncertain in 2022: female is cachinnans, male is very likely michahellis-type which eventually move to nest 41 in 2021.

Visits and data 2022:
Estimation egg laying: A-egg = April 06 2022?. Estimating hatching = May 04 2022.
   
11-04-2022 adult bird present. This is location nest 17-2021.
         
15-04-2022 A egg 77,8 50,2 No water test.
  B egg 77,3 49,9      
  C egg 70,9 48,5      
  Coded flag placed near nest. And red spot sprayed on stone near nest.
   
19-04-2022 adult bird present, same as April 11th. Neighbour is Herring Gull and behind 17 (on north side) is nest with y-X540.
             
29-04-2022 A egg float - 3 mm        
  B egg float - 2 mm        
  C egg float - 4 mm        
  Partner near nest seems to be a michahellis hybrid (River Gull), which moved from 17 to nest 41 in season 2021.
   
04-05-2022 both adults: cachinnans female and michahellis (-type) male.
             
09-05-2022 A egg infertile        
  pullus NLA 5625073 r-C.X      
  C egg infertile        
             
30-05-2022 both adults present: cachinnans female and michahellis (-type) male. Chick hides in vegetation.
             
17-06-2022 ringed juvenile at nest site, together with chicks from nest 223 (yX540)..
             
28-06-2022 both adults present.

below: Caspian Gull cachinnans C.X 1CY, May 09 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[C.X] cachinnans from nest 17. Picture: May 9th, 2022.
Only chick from nest 17, other 2 eggs infertile. On June 17th a ringed chick in nest 17, probably r[C.X].