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 y-PNED

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 002 positioned high on artificial breakwater in reedbed, between some small Elderberry bushes and dense Blackberry vegetation. 2 meters from nest 001.
  • ID certain in 2020, breeders are Caspian Gull cachinnans PNED 8CY and unringed adult partner.
  • ID certain in 2021, same breeders are Caspian Gull cachinnans PNED 9CY and unringed adult partner.
  • ID certain in 2022, same breeders are Caspian Gull cachinnans PNED 10CY and unringed adult partner.
location Nest in vegetation. April 16th, 2021: nest location. April 16th, 2021: nest location with Albert.
 
eggs Eggs April 15th, 2020: 1 egg clutch. Eggs April 27th, 2020: 3 eggs clutch. .
   
partner 1 May 7th, 2020: y PNED May 7th, 2020: y PNED June 2nd, 2020: y PNED
 
  June 2nd, 2020: y PNED April 26th, 2021: y PNED April 27th, 2022: y PNED
 
partner 2 May 7th, 2020: unringed partner May 7th, 2020: unringed partner April 27th, 2022: unringed partner
 
  May 7th, 2020: unringed partner 2021: unringed partner of y-PNED. 2022, May 4th: unringed partner of y-PNED.
 
pulli May 21st, 2020 pullus n[F|X]. June 2nd, 2020 unringed pullus, assumed nest 002. .
   
  May 28th, 2021 pullus red-F.F. May 28th, 2021 pullus red-F.G. June 14th, 2021: parents + 3 chicks (picture Camilla Dreef).
 
  June 8th, 2021 juvenile r-F.G. July 9th, 2021 juvenile r-F.G. July 9th, 2021 juvenile r-F.G.
 
  May 17th, 2022: r-C.E dead. June 21st, 2022: r-C.D fledged. June 28th, 2022: r-C.D fledged.
 

Visits and data.

date: egg no: width (mm): length (mm): volume (cm3):  water test on April 27th: laying date:  
15-04-2020 A 51,8 71,3 96,33 90 - floating, 4mm above surface    
             
27-04-2020 B 51,3 75,5 100,04 90 - floating, 4mm above surface  
  C 50,5 68,1 87,44 90 - hafway in water  
sum nest: 283,81
     
21-05-2020 pullus Empty nest, 1 chick near nest, ringed Noir F|X
     
date:    
16-04-2021 y[PNED] present at nest guarding at blocks, nest with 3 eggs.
  egg no: width (mm): length (mm): volume (cm3):  water test on April 16th:  
  A egg 52,1 77,3 105,65 35 - tip bottom  
  B egg 52 76 103,47 35 - tip bottom  
  C egg 50,8 69,5 90,30 35 - tip bottom  
    sum nest: 299,42  
     
26-04-2021 PNED present and alarming. Fight with neighbour or partner.
  Partner PNED also present.
     
06-05-2021 Picture of partner.
  2 eggs hatching, 1 pullus just emerging.
     
15-05-2021 No visit.
     
28-05-2021   metal tibia mass head + bill  
  pull .5559430 red-F.F 908 105  
  pull .5559431 red-F.G 673 94,8  
     
08-06-2021 At north side of dam 1: r-F.G and another chick at the blocks (is this maybe r-F.F?).
     
14-06-2021 Picture Camilla Dreef: 2 ringed + 1 unringed chick together with parents at blocks.
     
26-06-2021 No visit.
     
09-07-2021 Picture of r-F.G added, now a handsome juvenile.
   
date:    
11-04-2022 y[PNED] present at nest.
   
12-04-2022 y[PNED] present at nest.
   
15-04-2022 y[PNED] present at nest.
  egg no: width (mm): length (mm): volume (cm3):  water test on April 15th:  
  A egg 50,4 71,6 -- 70 - tip bottom  
  B egg 51 73,4 -- 80 - tip bottom  
  C egg 50,5 75,8 -- 90 - tip bottom  
    sum nest: --  
     
19-04-2022 y[X56A] present at nest for a short while, took off again.
     
27-04-2022 y[PNED] present at nest. Place yellow-black flag.
  egg no: width (mm): length (mm): volume (cm3):  water test on April 15th:  
  A egg     -- 2 mm - floating  
  B egg     -- 4 mm - floating  
  C egg     -- 3 mm - floating  
     
01-05-2022 y[PNED] guarding at nest. Partner breeding.
     
09-05-2021   metal tibia mass head + bill  
  pull 5625055 r-C.D -- --  
  pull 5625056 r-C.E -- --  
  food r-CE throws up 1 Rounded Goby.
  egg 1 old egg.
   
17-05-2022 r-CE dead, stuck between rocks.
   
30-05-2022 r-CD swimming between dams. Aggressively protected by y-PNED.
   
17-06-2022 r-CD swimming/flying between dams. Aggressively protected by y-PNED.
   
21-06-2022 r-CD swimming/flying between dams. Aggressively protected by y-PNED.
   
28-06-2022 r-CD swimming/flying between dams. Aggressively protected by y-PNED.