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 M06 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 "M06" in season 2021.
pulli: May 14th, 2021: pullus r[K.5]. May 14th, 2021: pullus r[K.6]. June 11th, 2021: parent & pullus.
 
prey: May 20th, 2021: Rounded Goby 1x. May 28th, 2021: Cormorant egg 5x. May 28th, 2021: Roach 2x.
 
  May 28th, 2021: Black-headed Gull pull 1x. May 28th, 2021: large white-headed gull egg 1x.  
 

Visits and data.

Date: details:          
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 67.9 49.5
  B egg 65.1 48.8
  C egg 71.4 50.2    
Attempt to trap breeding adult. Failed.          
           
14-5-2021 2 pulli & 1 hatching egg in nest. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214664240/ NLA 5.556.739 r-K.5 66 49.0 28.9
  NLA 5.556.740 r-K.6 72 49.8 28.2
         
20-5-2021 1 pullus present. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Rounded Goby 1x; Black-headed Gull pull 2x NLA 5.556.739 r-K.5 153 60.8  
https://waarneming.nl/observation/214907849/          
           
28-5-2021 No chicks present. Many prey left-overs.          
https://waarneming.nl/observation/215271016/          
             
11-6-2021 Camera trap: 1 pullus & 1 adult. https://waarneming.nl/observation/224226687/