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 FT 1CY-2CY, May 2021 - April 2022, De Kreupel & Almere, the Netherlands & Gijón, Spain. Picture: César Fernández González, Eric Roeland, Thijs Horst & Leon Kelder.

Pale blue tibia ring p[FT], ringed as pullus on May 14 2021 at nest C06 21 in colony De Kreupel island C, the Netherlands.
ID uncertain: 1 parent seems to be Herring Gull argentatus-type, other parent is unknown. Still, picture June 2021 illustrates clear cachinnans influences.

Visits & data:

Date: details:          
           
14-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  Prey: 1x Roach; 2x Eel. NLA 5.556.713 Pale FR 92 54.6 31.9
  https://waarneming.nl/observation/214662060/ NLA 5.556.714 Pale FS 106 56.8 33.3
    NLA 5.556.715 Pale FT 76 51.3 29.1
   
20-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
  Prey: 1x Roach; 1x Rounded Goby. NLA 5.556.713 Pale FR 313 71.1 52.0
  https://waarneming.nl/observation/214706998/ NLA 5.556.714 Pale FS 296 72.4 57.5
    NLA 5.556.715 Pale FT 207 67.0 --
             
11-6-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
  Prey: 4x Roach & 1x Perch (vomited) NLA 5.556.713 Pale FR 1094 117.0 278.5
  https://waarneming.nl/observation/216984901/  NLA 5.556.714 Pale FS 917 113.4 277.5
    NLA 5.556.715 Pale FT 1104 114.7 253.0

P-FT and metal NLA Arnhem 5.556.715, ringed as pullus Larus cachinnans on 14-05-2021 at IJsselmeer (De Kreupel), Holland (NL 5247.00 N 513.00 E) - ringer Leon Kelder.

Recoveries:
20-05-2021, IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
11-06-2021, IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
17-07-2021, IJmuiden (Forteiland), Noord-Holland, NL 5.228,00 N 434,00 E colourring read Fred Cottaar
22-07-2021, Katwijk aan Zee (Buitenwatering), Zuid-Holland, NL 5.212,00 N 423,00 E colourring read Annelies Marijnis
04-08-2021, Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
13-10-2021, Gijón (Strand), Asturias, SPANJE 4.332,00 N 539,00 W colourring read César Fernández

below: Caspian Gull cachinnans FT 2CY, April 26 2022, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans FT 1CY, October 13 2021, Gijón, Asturias, Spain. Picture: César Fernández González.

In all respects resembling cachinnans.

below: Caspian Gull cachinnans F9 1CY, August 04 2021, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans FT 1CY, June 11 2021, De Kreupel - C, the Netherlands. Picture: Leon Kelder.

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