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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Lelystad 2021
nest y-PNED
nest y-PLDP
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nest y-P:A02
nest y-P:U60
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nest 001
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nest 011
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nest 016B
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nest 034
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nest 040
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nest 045
nest 046
nest 047
nest 048
nest 053
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nest 065
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nest 072

 

Caspian Gull cachinnans F|L 1CY-3CY, May 2021 - April 2023, the Netherlands & Portugal. Picture: Mónika Ballmann, Thijs Horst, Mars Muusse, Rui Ferreira & Susana Bilber, Joao Lima.

Tibia B-F|L and metal Arnhem NLA 5.559.381, ringed as pullus Larus cachinnans on 28-05-2021 at nest 46 in colony Lelystad, the Netherlands (5230.00 N 525.00 E) - Roland-Jan Buijs.
ID certain, both parents are Caspian Gull cachinnans.

Recoveries:
01-12-2021 Figueira da Foz, Beira Litoral, PORTUGAL (4.009,00 N 851,00 W) - Rui Ferreira and Susana Bilber.
23-02-2022 Porto (da Foz da Ribeira da Granja), Douro Litoral, PORTUGAL (4.108,00 N 839,00 W) - Joao Lima.
17-08-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst.
01-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Jan Zorgdrager
04-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Mars Muusse
09-04-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
14-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland

Visits and data for nest 46.

date:              
  egg no: width (mm): length (mm): volume (cm3):  water test on April 16th: laying date:  
16-4-2021 A 51,8 83,7 113,08 90 - tip bottom   "the giant egg"!!!
16-4-2021 B 48 75,6 87,70 20 - tip bottom  
16-4-2021 C 48,1 73,5 85,62 35 - tip bottom  
sum nest: 286,40
   
24-4-2021 2 eggs, giant egg disappeared! water test on April 24th:  
24-4-2021 B egg 75 - tip bottom  
24-4-2021 C egg 90 - tip bottom  
26-4-2021 2 partners present.  
    mass  
15-5-2021 pullus 114 Food around nest: fish. Round Goby & Roach or Rudd (no head)
15-5-2021 pullus 172 Roach/Rudd probably from fishermen trap (dead by-catch).
    metal ring darvic ring mass head + bill  
28-5-2021 pullus .5559381 b-F|L 583 90,3 Food around nest: fish. Pike Perch & Roach (extremely unlikely
    parents caught this, must have been by-catch from fishermen).
           
08-6-2021             No visit.
26-6-2021             No chicks found, despite intensive search between blocks.
              Intense smell of fish and lots of left-overs. No alarming parents.

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

below: Caspian Gull cachinnans F|L 3CY, April 04 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans F|L 2CY, August 17 2022, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans F|L 2CY, February 23 2022, Porto, Portugal. Picture: Joao Lima.

below: Caspian Gull cachinnans F|L 1CY, December 01 2021, Figueira da Foz, Beira Litoral, Portugal. Picture: Rui Ferreira & Susana Bilber.

below: Caspian Gull cachinnans F|L 1CY, May 15 2021, Lelystad, the Netherlands. Picture: Mónika Ballmann.