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 De Kreupel 2020
nest r-02P4 20
nest y-X804 20
nest D01 20
nest D02 20
nest D03 20
nest L01 20
nest L02 20
nest L03 20
nest M02 20

Nests at De Kreupel 2021
nest r-02P4 20
nest w-201U 21
nest g-XLHD 21
nest r-KA 21
nest r-KB 21
nest r-KC 21
nest r-KD 21
nest r-KE 21
nest r-KF 21
nest r-KH 21
nest r-KJ 21
nest r-KK 21
nest A01 21
nest C03 21
nest C04 21
nest C06 21
nest D01 21
nest D03 21
nest D05 21
nest D06 21
nest D07 21
nest D08 21
nest E01 21
nest H01 21
nest L01 21
nest L02 21
nest L05 21
nest L06 21
nest L07 21
nest M01 21
nest M04 21
nest M06 21
nest Q01 21

Caspian Gull cachinnans FW 1CY, May 14 2021, De Kreupel - D, the Netherlands. Picture: Leon Kelder.

Pale blue tibia ring p[FW] and metal NLA 5.556.718, ringed as pullus on May 14 2021 at nest D02 21 in colony De Kreupel island D, the Netherlands. Ringer: Leon Kelder.
ID uncertain: 1 parent is Caspian Gull cachinnans, other parent is unknown.

Recoveries:
20-05-2021 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
11-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
28-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
30-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read J. van Assema & T. Horst
05-08-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst, M. Muusse & T. Muusse

Data for 2021:

Date: details:            
           
9-4-2021 1 egg in nest. egg no: width (mm): length (mm): volume (cm3): 
https://waarneming.nl/observation/210431375/ A egg 51.2 73.5
           
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 51.3 73.7
B egg 50.8 74.4      
C egg 49.1 71.1      
           
metal: tibia: wing: head + bill: bill:  
Adult trapped at nest: Caspian Gull. NLA 6.211.441 Red-K.F 484.0 138.3 67.3  
    mass: tarsus: moult score: bill height: grey scale Swob
    1095 74.5 10x0 20.0 6.5 1082
   
14-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  https://waarneming.nl/observation/214662455/ NLA 5.556.716 Pale FU 126 57.4 33.1
    NLA 5.556.717 Pale FV 185 63.5 38.6
    NLA 5.556.718 Pale FW 174 62.7 37.9
             
20-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
    NLA 5.556.716 Pale FU 335 73.5 65.5  
    NLA 5.556.717 Pale FV 466 81.8 77.0  
    NLA 5.556.718 Pale FW 430 79.8 78.5  

below: Caspian Gull cachinnans FW 4CY, July 28 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans FW 1CY, May 14 2021, De Kreupel - D, the Netherlands. Picture: Leon Kelder.