Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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

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Cachinnans - nest De Kreupel L01 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 "L01" in season 2021.
eggs: April 9th, 2021. April 9th, 2021. April 9th, 2021: 2 eggs in nest.
 
pulli: May 14th, 2021: pullus r[K.Z]. May 14th, 2021: pullus r[K.=]. May 14th, 2021: pullus r[K.+].
 

prey: May 28th, 2021: Rounded Goby 1x.    
     

Visits and data.

Date: details:          
9-4-2021 2 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
https://waarneming.nl/observation/210431063/ A egg 50.2 72.5
  B egg 50.7 71.2
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 49.9 72.2
  B egg 51.2 71.2
Attempt to trap breeding adult. Failed. C egg 49.9 72.9
         
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214663458/ NLA 5.556.731 Red K.Z 205 65.5 41.7
  NLA 5.556.732 Red K.= 250 67.3 43.6
NLA 5.556.733 Red K.+ 239 68.3 42.9
           
20-5-2021 Only 1 chick found between blocks. metal: tibia: mass (gr): head + bill: wing:
NLA 5.556.733 Red K.+ 547 85.6 90.0
             
   
28-5-2021 No chicks, but many shit traces.          
  Prey: Rounded Goby 1x https://waarneming.nl/observation/215269092/