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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Caspian Gull cachinnans 201:U 6CY & 8CY, May 2021 & December 2023, De Kreupel & Almere, the Netherlands. Picture: camera trap & Mars Muusse.

You can participate in this project too! Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl

Coordinator: Leon Kelder.
Ringers: Roland-Jan Buijs, Leon Kelder & Merijn Loeve.

White 201:U was observed in the Netherlands in it's first winter, but was also recorded back in Czechia in 3rd winter.
Nonetheless, it decided to start breeding in the recently established colony De Kreupel, in the Netherlands, as breeder of nest 201U 21 at island D, temporarily nest coded D04.

Ring data:
White ring 201:U and metal CZP CX1348, ringed as pullus Larus cachinnans on May 27 2016 at Pasohlávky, Jihomoravský kraj, Czechia (48°53'49"N 16°36'4"E) - ringer František Zicha.

Recoveries:
2017-01-20, Hazepad, Breda, Noord-Brabant, The Netherlands | 51.618516; 4.768643 | 893 km | Jeroen Nagtegaal
2017-03-31, Zwenkauer See, Zwenkau, Leipzig, Germany | 51.233333; 12.316667 | 401 km | Andreas Krüger
2017-04-06, Haselbacher Teiche, Haselbach, Thüringen, Germany | 51.073333; 12.444167 | 383 km | Steffen Wolf
2019-12-13, vodní nádrž Modlany, (Modlany), Ústecký kraj, Czechia | 50.650827; 13.882856 | 276 km | Václav Beran
2021-05-20, Island De Kreupel, Enkhuizen, Noord-Holland, The Netherlands | 52.798673 5.22688 | 907 km | Leon Kelder
2021-05-24, Noorderkwelweg, Den Oever, Noord-Holland, The Netherlands | 52.897; 5.038 | 923 km | Fred Visscher
2022-05-26 IJsselmeer, De Kreupel, Noord-Holland | The Netherlands | 52.7992; 5.2214 | 908 km | Leon Kelder
2023-09-28 Andijk, Noord-Holland | NL14 | The Netherlands | 52.755138; 5.205301 | 907 km | A.J. Laansma
2023-12-01 Almere - De Vaart, Flervoland | The Netherlands | Gabriel Mártin, Thijs Horst & Mars Muusse

Nest data for nest 201U-2021:

Date: details:            
           
23-4-2021 1 egg in nest. egg no: width (mm): length (mm): volume (cm3): 
Attempt to trap breeding adult. Failed. A egg 50.6 73.8
           
14-5-2021 2 eggs in nest.        
2 adults near nest. One ringed w[201:U].      
https://waarneming.nl/observation/214662645/            
           
20-5-2021 1 egg hatching & 1 chick. metal: tibia: mass (gr): head + bill: tarsus:  
Prey: 1x Roach. NLA 5.556.757 b-D|0 75 48.6 27.8  
https://waarneming.nl/observation/214707336/            
  Camera trap near nest: 1 pullus & 2 adults.            
  https://waarneming.nl/observation/223648760/            
   
28-5-2021 2 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  Unringed male Caspian & w[201:U] female Caspian. NLA 5.556.757 b-D|0 231 66.7 41.6  
    NLA 5.556.771 r-B.2 168 61.2 36.2  

Again breeding at de Kreupel, in 2022: nest D7-2022 on island D. Data for this nest:

Date: Egg code Height (mm)  Width (mm) Comments Metal NLA Colour ring Wing (mm) Head+ bill (mm) Bill (mm) Mass (gr) Tarsus Gonys Swab no
29-4-2022   3 eggs
trapped adult Herring Gull 6214039 Red 0.H 419 109.5 47.8 791 62.4 18.6 1073
13-5-2022 3 eggs
26-5-2022 1 pullus in nest 5623606 Red 4.F 50.7 90
Caspian Gull w-201:U alarming over nest location

below: Caspian Gull cachinnans 201:U 8CY, December 01 2023, Almere - De Vaart, the Netherlands. Picture Mars Muusse.

below: Caspian Gull cachinnans 201:U 6CY, May 20 2021, De Kreupel - L, the Netherlands. Picture: camera trap.