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 KD 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 "L". Nest coded "L04" in season 2021, but renamed after trapping adult, now coded as ring code.
partner 1: April 23rd, 2021: r-K.D (more images) & Leon Kelder. June 2nd, 2021: male Caspian Gull cachinnans r-K.D. June 1st, 2021: male Caspian Gull cachinnans r-K.D.
 
  May 30th, 2021: pullus b[D|9] & 1x unringed pullus. May 29th, 2021: male Caspian Gull cachinnans r-K.D. May 30th, 2021: male Caspian Gull cachinnans r-K.D.
 
partner 2: May 30th, 2021: female Caspian Gull cachinnans. May 29th, 2021: female Caspian Gull cachinnans. May 31th, 2021: female Caspian Gull cachinnans.
 
pulli: May 20th, 2021: pullus b[D|9]. . .
     

Visits and data.

Date: details:          
23-4-2021 2 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 48.4 69.3
  B egg 48.6 70.3
         
Attempt to trap breeding adult. Adult trapped. metal: tibia: wing: head + bill: bill:
Adult male Caspian Gull cachinnans. NLA 6.211.439 Red-K.D 472.0 141.0 70.5
  mass: moult score: bill height: grey scale: Tarsus: & Swob:
  1145 10x0 19.8 6.5 74.2 & 1080
           
14-5-2021 2 eggs in nest.          
         
20-5-2021 1 pullus & 1 hatching egg. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214709154/ NLA 5.556.761 b-D|9 76 51.5 28.8
         
28-5-2021 2 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
  NLA 5.556.761 b-D|9      
  NLA 5.556.775 r-B.6 285 70.3 42.0
         
31-5-2021 Camera trap near nest: 2 pulli (1x unringed???!!!) & 2 unringed adults.
https://waarneming.nl/observation/221650519/