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-P:U60 (068)

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 068 positioned at breakwater 1, centre of large blocks east of T split. Parents has look-out with loads of shit.
  • ID certain in 2021, both are Caspian Gull cachinnans, female is 4CY Caspian Gull y[P:U60], male is large bird.
  • ID certain in 2022, same Caspian Gull cachinnans, female is 5CY Caspian Gull y[P:U60], male is large bird.
location March 24 2021: 2 partners at dam 1. March 30 2021: 2 partners at Almere waste dump
(17 km's distance from colony).
April 19 2022: partner 2.
 
nest April 15 2022: 3 eggs. April 27 2022: 3 eggs. April 27 2022: egg floating.
 
partner 1 March 24 2021: y-P:U60 female cachinnans. May 15 2021: y-P:U60 female cachinnans. June 08 2021: y-P:U60 female cachinnans.
 
  April 27 2022: y-P:U60 female cachinnans. April 27 2022: y-P:U60 female cachinnans. may 27 2022: y-P:U60 female cachinnans.
 
partner 2 April 27 2022: male cachinnans. May 30 2022: male cachinnans. May 30 2022: male cachinnans.
 
pullus June 21 2022: chick cachinnans r-5.R. June 21 2022: chick cachinnans r-5.S. June 21 2022: chick cachinnans r-5.T.
 
prey May 17 2022: Roach / Rudd. May 17 2022: Perch. .
   

Visits and data.

date: egg no: width (mm) length (mm) volume (cm3):  water test on May 7th:  
06-05-2021 A 50,1 73,3 91,34 90 - tip at bottom. 2 eggs in the nest, one partner is y[P:u60] 4CY cachinnans.
  B 49,2 70,9 92,28 90 - floating halfway.  
      sum nest: --    
13-05-2021 No visit, Camilla is trapping a spoonbill.
         
15-05-2021 2 eggs, still complete. y[P:U60] and partner is large Caspian Gull male.
         
28-05-2021 nest is empty. y[P:U60] and partner both alarming. Chicks not found between all those blocks.
         
08-06-2021 No activity visible from south side. Later, from north side y[P:U60] flying around.
   
date:            
12-04-2022 y-P:U60 present. Nest not excatly located yet, but close to place of previous season.
             
  egg no: width (mm) length (mm) volume (cm3):  water test on April 12th:  
15-04-2022 A 51,8 72,9 -- 40 - tip at bottom. 3 eggs in the nest.
  B 51,3 71,6 -- 30 - tip at bottom. Extrapolation: 1st egg laid on April 9th; 1st egg will hatch on May 7th. Ring: May 14th.
  C 50,1 70,5 -- 20 - tip at bottom.  
      sum nest: --    
   
27-04-2022 A       4 mm- floating. 3 eggs in the nest.
  B       3 mm- floating.  
  C       2 mm- floating.  
             
09-05-2022 y-P:U60 present.
   
  metal darvic mass  
17-05-2022 .5625114 r-5T 293 Much fish around nest, incl Roach / Rudd and Perch.
  .5625115 r-5S 191      
  .5625116 r-5R 329      
         
  metal darvic mass  
30-05-2022 .5625116 r-5R 680 y-P:U60 and partner are present, together with (at least) .
   
02-06-2022 2 adults and 3 large chicks present.
   
17-06-2022 2 adults and (at least) 2 chicks present.
   
21-06-2022 2 adults and all 3 large chicks r-5R, r-5S & r-5T present.
   
28-06-2022 2 adults and all 3 large chicks r-5R, r-5S & r-5T present.