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 7.F 1CY-3CY, May 2022 - April 2024, Lelystad, the Netherlands. Picture: Thijs Horst, Harry Kuipers, Mars Muusse & Daanjan Wisselink.

Red tibia ring r[7.F] and metal NLA 5.625.118, ringed as pullus Larus cachinnans at nest 26 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs ringing team.
ID certain, both parents are Caspian Gull cachinnans.

Recoveries:
30-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E captured by ringer Albert de Jong
23-05-2023 Hasselt (Zeldenrust), Overijssel, NL 5.234,00 N 605,00 E colourring read G.J. Gerritsen
30-06-2023 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
30-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Harry Kuipers & Thijs Horst
11-04-2024 Wijhe (Buitenwaarden), Overijssel, NL 5.223,00 N 608,00 E colourring read Daanjan Wisselink

Visits and data 2022 for nest 26:
Estimation egg laying: A-egg = April 15 2022. Estimating hatching = May 13 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):       
15-04-2022 A 48,7 72,0 --   1 egg.  
sub-adult Caspian near nest.
     
19-04-2022 sub-adult Caspian near nest.  
   
  egg no: 3 eggs.        
27-04-2022 A - - tip bottom - 90      
  B 49,6 70,2 tip bottom - 70    
C 50,0 72,5 tip bottom - 90
               
    metal          
17-05-2022 pullus 5625117 2 days old.        
  pullus 5625118          
1x egg: infertile.  
   
    metal colour mass wing head + bill Bill
30-05-2022 pullus 5625117 r-7.E 612 126 95,7 38,1
  pullus 5625118 r-7.F 522 96 88,2 36,6
1x egg: infertile.  
   
02-06-2022 r7E & r7F present.
   
17-06-2022 r7E & r7F present.
   
21-06-2022 r7E & r7F present
   
28-06-2022 r7E & r7F present
   
12-07-2022 r7E & r7F present
  Male cachinnans 4CY & female cachinnans.

below: Caspian Gull cachinnans 7.B 3CY, May 14 2024, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.F 3CY, April 11 2024, Wijhe, the Netherlands. Picture: Daanjan Wisselink.

below: Caspian Gull cachinnans 7.F 3CY, March 30 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Harry Kuipers.

below: Caspian Gull cachinnans 7.F 1CY, July 17 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.F 1CY, July 12 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7.F 1CY, June 28 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

r[7.F] cachinnans from nest 26. Picture: May 30th, 2022.
Fledged. Sibling r[7.E] also fledged. 3rd egg infertile.

below: Caspian Gull cachinnans 7.F 1CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.