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 L02 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 north.
location Nest in vegetation. Eggs April 10th, 2020: 3 eggs clutch. Eggs April 10th, 2020: 3 eggs clutch.
 
partner 1 date: April 10th, 2020. . .
     
pulli May 21st, 2020 pullus p[F2]. May 21st, 2020 pullus p[F3]. May 21st, 2020 pullus p[F4].
 
 
pulli . June 12th, 2020 pullus p[F3]. June 12th, 2020 pullus p[F4].
   
   
   
   
   
   

Visits and data.

date: egg no: width (mm): length (mm): volume (cm3):      comments:
10-4-2020 A 49,3 68,1 115,12     3 eggs in nest.
10-4-2020 B 48,4 65,7 105,19    
10-4-2020 C 48,9 71,7 126,57    
             
24-4-2020 Attempt to trap parents at nest. Unsuccessful. 3 warm eggs.
             
      WING: HEAD + BILL: BILL: WEIGHT:
8-5-2020 pullus NLA 5.545.419 & p[F2] -- 54.3 19.6 98 3 pulli at nest.
8-5-2020 pullus NLA 5.545.420 & p[F3] -- 54.4 19.9 101
8-5-2020 pullus NLA 5.545.421 & p[F4] -- 51.0 19.5 78  
       
21-5-2020 pullus NLA 5.545.419 & p[F2] 120.0 94.7 38.3 680 3 chicks at the nest.
21-5-2020 pullus NLA 5.545.420 & p[F3] 124.5 94.1 37.6 672  
21-5-2020 pullus NLA 5.545.421 & p[F4] 99.5 88.6 37.7 550  
             
12-6-2020 NLA 5.545.420 & p[F3] 346.5 126.7 55.0 1117 2 chicks at the nest.
12-6-2020 NLA 5.545.421 & p[F4] 327.0 126.1 52.4 1221