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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International trend
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Site characteristics
Breeding biology
Fecundity
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Nonbreeding season
Breeding species
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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 K.W 1CY-3CY, May 2021 - April 2023, the Netherlands & France. Picture: Thijs Horst, Mars Muusse, Leon Kelder & Patrick Derrien.

Red tibia ring r[K.W] and metal NLA 5.556.728, ringed as pullus Larus cachinnans on May 14 2021 at nest L05 21 in colony De Kreupel - IJsselmeer, the Netherlands (5247.00 N 513.00 E) - ringer Leon Kelder.
ID is uncertain: mother is Caspian Gull cachinnans, father is unknown.

Recoveries:
20-05-2021 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder.
19-01-2022 Sonzay (Vuilstort), Indre-et-Loire, FRANKRIJK 4.730,00 N 28,00 E colourring read Patrick Derrien.
20-01-2022 Sonzay (Vuilstort), Indre-et-Loire, FRANKRIJK 4.730,00 N 28,00 E colourring read Patrick Derrien
30-07-2022 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
17-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
09-04-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst

Visits:

Date: details:          
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 50.7 70.0
  B egg 50.9 71.7
C egg 50.3 74.6
Attempt to trap breeding adult. Adult Caspian Gull cachinnans trapped, but escaped.
           
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Roach 3x. NLA 5.556.728 Red K.W 73 48.0 27.5
https://waarneming.nl/observation/214663776/ NLA 5.556.729 Red K.X 87 52.9 29.8
    NLA 5.556.730 Red K.Y 81 52.5 30.4
         
20-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill:  
Prey: Roach 2x. NLA 5.556.728 Red K.W 204 62.7  
https://waarneming.nl/observation/214709851/ NLA 5.556.729 Red K.X 271 69.0  
  NLA 5.556.730 Red K.Y 256 69.0  
         
28-5-2021 Camera trap near nest: 1 unringed adult. https://waarneming.nl/observation/224226824/

below: Caspian Gull cachinnans K.W 3CY, April 09 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans K.W 3CY, March 17 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Probably female.

below: Caspian Gull cachinnans K.W 2CY, August 02 2022, De Kreupel - H, the Netherlands. Picture: Leon Kelder / camera trap.

below: Caspian Gull cachinnans K.W 2CY, January 19 2022, Sonzay dump, France. Picture: Patrick Derrien.

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