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 KB 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 "M03" in season 2021, but renamed after trapping adult, now coded as ring code.
location: April 9th, 2021. April 9th, 2021. .
   
partner 1: April 23rd, 2021: adult male Caspian Gull cachinnans (or hybrid?) r-K.B (more images).  
     
pulli: May 14th, 2021: pullus r[K.2]. May 14th, 2021: pullus r[K.3]. May 14th, 2021: pullus r[K.4].
 
prey: April 23rd, 2021: adult vomited Spike Perch 2x. . .
     

Visits and data.

Date: details:          
9-4-2021 2 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
https://waarneming.nl/observation/210427139/ A egg 53.2 73.6
  B egg 53.2 72.1
         
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  C egg 51.6 70.9
  A egg 53.4 73.7
B egg 53.3 71.9    
         
Attempt to trap breeding adult. Adult trapped. metal: tibia: wing: head + bill: bill:
Adult male Caspian x Herring Gull hybrid type. NLA 6.211.437 Red-K.B 454 128.3 48.5
Adult vomited Spike Perch. mass: moult score: bill height: grey scale: Tarsus: & Swob:
https://waarneming.nl/observation/211828921/ -- 10x0 17.1 6 73.1 & 1078
           
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214663982/ NLA 5.556.736 r-K.2 281 69.3 45.8
  NLA 5.556.737 r-K.3 260 62.2 45.3
  NLA 5.556.738 r-K.4 319 62.2 51.8
         
20-5-2021 Found back only 1 pullus. metal: tibia: mass (gr): head + bill: wing:
  NLA 5.556.738 r-K.4 567 90.6 121.5