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

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 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 D|G 1CY, June & August 2021, De Kreupel, the Netherlands & St. Mary's Island, UK. Picture: John Malloy & Leon Kelder.

Blue tibia ring b[D|G], ringed as pullus Larus cachinnans on May 14 2021 at nest r-02P4 /KG 21 in colony De Kreupel, the Netherlands.
ID certain, 2 parents are Caspian Gull cachinnans, one ringed in Poland.

Blue tibia B-D|G and metal NLA Arnhem 5.556.748, ringed as pullus Larus cachinnans on 14-5-2021 at IJsselmeer (De Kreupel), Holland ( NL 5247.00 N 513.00 E) - ringer Leon Kelder.

Recoveries:
2-8-2021 Kilnsea Wetlands, East Yorkshire, ENGELAND 5.237,00 N 7,00 E colourring read John Hewit
9-8-2021 Kilnsea Wetlands, East Yorkshire, ENGELAND 5.237,00 N 7,00 E colourring read Steve Webb
21-8-2021 St. Mary's Island (Intertidal zone), Tyne and Wear, ENGELAND 5.503,00 N 127,00 W colourring read John Malloy

Nest data 2021:

date: egg no: width (mm): length (mm): volume (cm3):      comments:
9-4-2021 A egg 51.2 74.1       r[02P4] & unringed adult male at nest.
  B egg 49.0 67.2       3 eggs.
  C egg 51.1 78.7       https://waarneming.nl/observation/210425398/
     
23-4-2021 eggs 3 eggs in nest.
    Attempt to trap adult at nest. Successful: r[02P4] trapped and new ring attached.
    metal: tibia: wing (mm) head + bill tarsus bill
  adult Gdansk DN31202 Red-K.G 445.0 126.0 65.3 59.1
    mass (gr) Moult score bill height grey scale Swob  
    858 10x0 17.1 5.5 1083  
     
      WING: HEAD + BILL: TARSUS: MASS (gr):  
14-5-2021 pullus NLA 5.556.747 & b[D|E] 86.0 83.1 54.1 433 2 chicks outside nest, ringed.
  pullus NLA 5.556.748 & b[D|G] 73.0 82.5 54.8 439 No eggs. What happened to 3rd chick?
  prey 5x Cormorant eggs; 1x Coot egg; 1x leg of pullus Grey-lagged Goose. https://waarneming.nl/observation/214661741/
     
20-5-2021 pullus Shit traces all over the place, but chicks not found.
    Alarming adults over nest location.
     
17-6-2021 juvenile 2 juveniles near nest, one is b-D|G. https://waarneming.nl/observation/217412355/
  adult Unringed male & female r-K.G present.

below: Caspian Gull cachinnans D|G 1CY, August 21 2021, St. Mary's Island, Tyne and Wear, UK. Picture: John Malloy.

below: Caspian Gull cachinnans D|G 1CY, August 21 2021, St. Mary's Island, Tyne and Wear, UK. Picture: John Malloy.

below: Caspian Gull cachinnans D|G 1CY, June 17 2021, De Kreupel nest KG 21, the Netherlands. Picture: Leon Kelder.