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

Home

Project Info
International trend
National trend
Site characteristics
Breeding biology
Fecundity
Food resources
Nonbreeding season
Breeding species
Hybrid scores
Ring codes
Future

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.V 1CY, May - October 2021, De Kreupel, the Netherlands, Saint-Aubin-sur-Mer, France & Morecambe Bay, U.K. Picture: Leon Kelder, Paul Ellis & Julien Yvon.

Red tibia ring r[K.V], ringed as pullus Larus cachinnans on May 14 2021 at nest L02 in colony De Kreupel, the Netherlands.
ID is uncertain: one parent is Caspian Gull cachinnans, and one parent is Caspian Gull cachinnans hybrid-type.

Date: details:          
9-4-2021 2 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
https://waarneming.nl/observation/210431163/ A egg 50.1 70.5
  B egg 50.3 71.5
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  C egg 50.0 68.6
  A egg 50.5 70.3
Attempt to trap breeding adult. Failed. B egg 50.2 71.4
         
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214663702/ NLA 5.556.725 Red K.T 319 70.9 44.7
  NLA 5.556.726 Red K.U 272 70.2 42.2
NLA 5.556.727 Red K.V 164 62.2 36.2
           
20-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: wing:
Prey: Perch 1x. NLA 5.556.725 Red K.T 675 88.1 105.5
  https://waarneming.nl/observation/214708986/ NLA 5.556.726 Red K.U 606 85.7 98.0
    NLA 5.556.727 Red K.V 400 77.8 65.5
             
28-5-2021 Camera trap near nest: 3 pulli & 2 unringed adults. Adults are Caspian Gull cachinnans.
  https://waarneming.nl/observation/222467166/          
   
4-6-2021 No chicks present at visit, but 3 chicks today at camera trap!
  Prey: Russian Carp! https://waarneming.nl/observation/216519972/
   
11-6-2021 2 pulli near nest. metal: tibia: mass (gr): head + bill: wing:
Prey: large Eel. NLA 5.556.725 Red K.T 1162 125.0 331.0
  https://waarneming.nl/observation/216987685/ NLA 5.556.726 Red K.U 1214 122.7 317.5

Red tibia R-KV and metal NLA 5.556.727, 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:
20-5-2021 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
15-8-2021 Saint-Aubin-sur-Mer (Strand), Seine-Maritime, FRANKRIJK 4.919,00 N 23,00 W colourring read Julien Yvon

below: Caspian Gull cachinnans K.V 1CY, October 24-25 2021, Cocker’s Dyke - Morecambe Bay, U.K. (53.56.21N 002.57.17W). Picture: Paul Ellis.

Completely matching a perfect cachinnans.

below: Caspian Gull cachinnans K.V 1CY, August 15 2021, Saint-Aubin-sur-Mer, Seine-Maritime, France. Picture: Julien Yvon.

below: Caspian Gull cachinnans K.V 1CY, June 04 2021, De Kreupel - L, the Netherlands. Picture: Leon Kelder.

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