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 KK 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 "C". Nest coded "C02" in season 2021, but renamed after trapping adult, now coded as ring code.
location April 9th, 2021. April 9th, 2021: 1 egg. April 9th, 2021: 1 egg.
 
partner 1: April 23rd, 2021: adult r-K.K (more images). . .
     
pulli: May 14th, 2021: pullus p[FP]. May 14th, 2021: pullus p[F0]. May 14th, 2021: pullus p[FN].
 

Visits and data.

Date: details:            
    egg no: width (mm): length (mm): volume (cm3): 
9-4-2021 1 egg in nest, cold.
https://waarneming.nl/observation/210432243/
A egg 50.0 72.5  
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
    B egg 51.6 74.0
    C egg 49.1 68.9
  A egg 50.0 72.2
metal: tibia: wing: head + bill: bill:  
Adult male trapped at nest. NLA 6.211.444 Red-K.K 459.0 124.2 53.8  
    mass: tarsus: moult score: bill height: grey scale Swob
    994 69.5 10x0 18.0 5.5 1086
   
14-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  https://waarneming.nl/observation/214661812/ NLA 5.556.710 Pale FN 115 57.3 33.8  
    NLA 5.556.711 Pale F0 223 67.4 43.6  
    NLA 5.556.712 Pale FP 211 67.6 44.4  
   
20-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
    5556710 Pale FN 321 72.2 56.5
    5556711 Pale F0 517 85.2 94.5
    5556712 Pale FP 506 84.0 90.0