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 Lelystad 008

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 008 positioned on open tarmac patch (but next to Elderberry) of breakwater 1 west of T-split.
  • Certainty on ID, breeders are Caspian Gull cachinnans, one partner is ringed green XLDT from Germany, and one unringed partner.
  • In 2021 we did not find back g-XLDT in the colony, despite its presence at a nearby waste treatment plant in February 2021.
location Nest location on April 15th, 2020. Nest location on April 27th, 2020. Eggs April 15th, 2020: 2 eggs clutch. Eggs April 27th, 2020: 3 eggs clutch.
 
partner 1 May 7th, 2020: cachinnans g[XLDT]. May 7th, 2020: cachinnans g[XLDT]. April 15th, 2020: cachinnans g[XLDT]. April 15th, 2020: cachinnans g[XLDT].
 
partner 2 May 7th, 2020: cachinnans unringed. April 15th, 2020: cachinnans unringed. . .
     
pullus April 27th, 2020: n[F|L]. HY=2019. . . .
       

Visits and data.

datum: egg no: width (mm) length (mm) volume (cm3):  water test on April 27th:  
15-04-2020 A 50,8 74 96,15 90 - floating, 2mm above surface 2 eggs in nest.
15-04-2020 B 50,1 74,2 93,77 90 - floating, 1mm above surface
       
27-4-2020 C 50,7 71,6 92,67 90 - hafway in water 3rd egg now as well in nest.
  sum nest: 282,59
07-05-2020 eggs     B-egg start to hatch.
   
21-05-2020 --     Nest unsuccessful. No left-overs, no shit, no chicks, no alarming parents.
     
02-06-2020 --   Nest empty, but parents still around.