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

Home

Herring Gull argenteus NLA 6.525.104 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Metal NLA 5.625.104, ringed as pullus Larus argentatus at nest 62 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Jeroen Nagtegaal ringing team.
ID certain in 2022: same female as in 2021 (probably hybrid Caspian Gull cachinnans with broad medial band on P10, thin broken band on P5). Uncertainty about partner.

Visits and data 2022:
Estimation egg laying: A-egg = April 13 2022. Estimating hatching = May 11 2022.
   
12-04-2022 empty nest.
   
15-04-2022 2 eggs in nest.            
  egg no: width (mm) length (mm) volume (cm3):         
15-04-2022 A egg 50,1 68,1 --        
15-04-2022 B egg 51,6 68,4 -- water test on April 27th:       
27-04-2022 C egg 50,3 66,8 -- floating halfway      
  sum nest: --        
   
01-05-2022 Adult at nest 62: very thin line on P5 but clear cachinnans influences
   
09-05-2022 3 eggs: small crack in blue egg.
   
17-05-2022 1 pullus and 2 eggs present.
  prey: half fish at nest probably Rudd.
    metal code darvic mass  
  pullus NLA 5.625.104 - 165 Large pullus (16-18 days old), likely cachinnans from nest 60.
   
22-05-2022 Blue egg still present. No chicks found near nest, but hiding in Blackberry complex.

below: Herring Gull argenteus NLA 6.525.104 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.