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 L03 20

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 "L", positioned in centre.
location Google Map plot.      
         
pulli May 21st, 2020 pullus p[F7]. May 21st, 2020 pullus p[F8].    
     
pulli June 12th, 2020 pullus p[F7]. June 12th, 2020 pullus p[F8].    
     
     
     
     
     
       

Visits and data.

date: egg no: width (mm): length (mm): volume (cm3):      comments:
24-4-2020 A 50,7 71,8 131,60    
24-4-2020 B 50,8 70,8 128,21     Attempt to trap parents at nest. Unsuccessful. 3 warm eggs.
24-4-2020 C 50,2 73,9 138,04    
             
8-5-2020 A, B, C           3 warm eggs.
      WING: HEAD + BILL: BILL: WEIGHT:
21-5-2020 pullus NLA 5.545.427 & p[F7] -- 68.5 25.3 232 2 chicks at the nest.
21-5-2020 pullus NLA 5.545.428 & p[F8] -- 72.4 28.6 282  
             
12-6-2020 pullus NLA 5.545.427 & p[F7] 269.5 118.5 46.2 1142 2 chicks at the nest.
12-6-2020 pullus NLA 5.545.428 & p[F8] 276.0 120.9 48.4 1182