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 M01 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 "M". Nest coded "M01" in season 2021.
location: April 9th, 2021. April 9th, 2021. April 9th, 2021.
 
pulli: May 14th, 2021: pullus r[K.8]. May 14th, 2021: pullus r[K.9]. May 14th, 2021: pullus b[D|A].
 
prey: May 14th, 2021: Roach / Rudd 1x.    
     

Visits and data.

Date: details:          
9-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
https://waarneming.nl/observation/210426774/ A egg 52.9 74.5
  B egg 50.9 73.9
C egg 51.3 71.4
23-4-2021 3 eggs in nest.
Attempt to trap breeding adult. Failed.
           
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Roach / Rudd 1x. NLA 5.556.742 r-K.8 233 68.7 44.7
https://waarneming.nl/observation/214663900/ NLA 5.556.743 r-K.9 314 74.5 48.6
    NLA 5.556.744 b-D|A 311 73.4 73.4
         
20-5-2021 No chicks near nest, nest is empty, but shit traces.