Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Leon Kelder
Mars Muusse

Home

Cachinnans - nest De Kreupel L02 21

General remarks:

  • Eggs: Volume measured by Stonehouse (1964) and Spaans & Spaans (1975), which make comparison possible with data from Texel (Camphuysen pers comm 16.04.2020).
  • Nest on island "L". Nest coded "L02" in season 2021.
eggs: April 9th, 2021. April 9th, 2021. April 9th, 2021.
 
partner 1: May 14th, 2021: unringed Caspian Gull cachinnans. May 29th, 2021: Caspian Gull cachinnans. May 29th, 2021: female Caspian Gull cachinnans.
 
partner 2: May 28th, 2021: Caspian Gull hybrid type. May 28th, 2021: Caspian Gull hybrid type. May 30th, 2021: Caspian Gull hybrid type.
 
  June 4th, 2021: male Caspian Gull hybrid type.    
     
pulli: May 14th, 2021: pullus r[K.T]. May 14th, 2021: pullus r[K.U]. May 14th, 2021: pullus r[K.V].
 
  June 4th, 2021: 3 chicks. June 11th, 2021: pullus r[K.U]. .
   
  June 11th, 2021: pullus r[K.T]. June 11th, 2021: pullus r[K.T]. June 11th, 2021: pullus r[K.T].
 
  June 11th, 2021: pullus r[K.U]. June 11th, 2021: pullus r[K.U]. June 11th, 2021: pullus r[K.U].
 
prey: May 20th, 2021: Perch 1x. June 4th, 2021: Russian Carp. June 11th, 2021: Eel.
 

Visits and data.

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