Larus cachinnans in the Netherlands

(last update: August 16, 2020)
Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse

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Nests at 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 argentatus hybrid 6.Y 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[6.Y] and metal NLA 5.625.176, ringed as pullus Larus argentatus hybrid at nest 44 on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs ringing team.
ID certain in 2022: one parent is female adult argentatus, and father is male hybrid type ("River Gull").

Visits and data 2022 for nest 44:
Estimation egg laying: A-egg = April 19 2022. Estimating hatching = May 17 2022.

15-4-2022 empty nest
               
    length (mm) width (mm) volume (cm3):  water test on April 29th:     
29-04-2022 A egg 68,2 49,0 -- 80 gr - tip bottom    
  B egg 66,7 49,4 -- 85 gr - tip bottom    
  C egg 66,0 51,0 -- 80 gr - tip bottom    
One parent is argenteus (female partner)  
   
01-05-2022 female Herring Gull argenteus next to nest. River Gull male at blocks, guarding.
   
04-05-2022 Herring Gull at blocks near nest.
   
    metal darvic mass wing H+B bill
17-05-2002 pullus NLA 5625134 - 78 < 2 days od    
  pullus NLA 5625135 - 71      
A-egg is hatching.
 
    metal darvic mass wing H+B bill
30-05-2002 pullus NLA 5625176 r-6.Y 302 49 70 26,1
 
28-06-2022 1x Juvenile present, but no good view on legs to read the ring code.

below: Herring Gull argentatus hybrid 6.Y 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[6.Y] hybrid argentatus from nest 44. Picture: May 30th, 2022.
Ringed on May 30th. No observations since. Sibling NLA5625134 & NLA5626135 ringed on May 17th. No observations since. However, at least one chick present near nest at June 28th (but no good view on legs).