Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
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 008-2020 positioned on open tarmac patch (but next to Elderberry) of breakwater 1 west of T-split.
  • Nest 008-2024 positioned on open tarmac patch (but next to Blackberry) of breakwater 1 opposite harbour.
  • Certainty on ID in 2020, 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.
  • ID 2024: again green XLDT at dam 1, together with brutal male Caspian Gull cachinnans.
location Nest location on April 15th, 2020. Nest location on April 27th, 2020. May 02 2024: new location at dam 1.
 
eggs Eggs April 15th, 2020: 2 eggs clutch. Eggs April 27th, 2020: 3 eggs clutch. May 02 2024: 3 eggs.
 
partner 1 May 7th, 2020: cachinnans g[XLDT]. May 7th, 2020: cachinnans g[XLDT]. April 15th, 2020: cachinnans g[XLDT].
 
partner 1 April 15th, 2020: cachinnans g[XLDT]. May 02 2024: cachinnans g[XLDT]. May 02 2024: cachinnans g[XLDT].
 
partner 2 May 7th, 2020: cachinnans unringed. April 15th, 2020: cachinnans unringed. May 02 2024: unringed male cachinnans.
 
pullus April 27th, 2020: n[F|L]. HY=2019. . .
     
pullus May 14th, 2024: pullus g-C|K. May 14th, 2024: pullus g-C|L. May 14th, 2024: pullus g-C|M.
 
food May 14th, 2024: 14x fish around nest. . .
     

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.

Visits and data 2024.

NEST code parent 1 parent  2 A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST:
XLDT 2024 cach cach 73 49,9 91,52 76,3 49,7 94,89 76,7 51 100,45 286,86
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 25-4-2024 23-5-2024
   
dam: dam 1 west
location: Opposite the harbour
parents? g-XLDT & male cach
   
ring pulli: 28-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
14-05-2024 g-C|K .5631104 nest XLDT PONT 1CY 158          
14-05-2024 g-C|L .5631105 nest XLDT PONT 1CY 126          
14-05-2024 g-C|M .5631106 nest XLDT PONT 1CY 88          
                           
OBSERVATIONS:
02-05-2024 adults: XLDT & male cachinnans at nest site, incubating male. Attempt to trap male, failed.
eggs: 3x, measured.
14-05-2024 chicks: 3x ringed. Fish bolus (yellow) when processed.
food: 14x fishes: among other Perch, Roach, Goby.
18-06-2024 chicks: 3x chicks present at dam. With unringed father & g-XLDT.