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 KF 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 "D". Nest coded "D02" in season 2021, but renamed after trapping adult, now coded as ring code.
  April 9th, 2021. April 9th, 2021. April 9th, 2021.
 
partner 1: April 23rd, 2021: adult r-K.F (more images). . .
     
pulli: May 14th, 2021: pullus p[FU]. May 14th, 2021: pullus p[FV]. May 14th, 2021: pullus p[FW].
 

Visits and data.

Date: details:            
           
9-4-2021 1 egg in nest. egg no: width (mm): length (mm): volume (cm3): 
https://waarneming.nl/observation/210431375/ A egg 51.2 73.5
           
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 51.3 73.7
B egg 50.8 74.4      
C egg 49.1 71.1      
           
metal: tibia: wing: head + bill: bill:  
Adult trapped at nest: Caspian Gull. NLA 6.211.441 Red-K.F 484.0 138.3 67.3  
    mass: tarsus: moult score: bill height: grey scale Swob
    1095 74.5 10x0 20.0 6.5 1082
   
14-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  https://waarneming.nl/observation/214662455/ NLA 5.556.716 Pale FU 126 57.4 33.1
    NLA 5.556.717 Pale FV 185 63.5 38.6
    NLA 5.556.718 Pale FW 174 62.7 37.9
             
20-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
    NLA 5.556.716 Pale FU 335 73.5 65.5  
    NLA 5.556.717 Pale FV 466 81.8 77.0  
    NLA 5.556.718 Pale FW 430 79.8 78.5