Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse

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Cachinnans - nest Lelystad 127Z

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 123Z positioned on dam 1 south, 2 meters north of 62, visible from north side. Part of "control group Herring Gulls".
  • ID uncertain in 2022: likely both adults are Herring Gull.
  • ID uncertain in 2023: one adult trapped at nest = Herring Gull. Location is same as 2022.
location April 27th, 2022: location of nest. April 27th, 2 eggs. May 4th, 2022: 3 eggs.
 
partner 1 June 6th, 2023: r[7.M] feeding at dump Almere. July 8th, 2023: adult now ringed, r[7.M]. .
   

Visits and data:
Estimation egg laying: A-egg = April 25 2022. Estimating hatching = May 23 2022.

date:              
19-04-2022 nest is empty        
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
27-04-2022 A-egg 47,5 69,5   0 - tip on bottom    
  B-egg 47,2 69,1   0 - tip on bottom    
               
01-05-2022 adult Herring Gull breeding at nest  
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
04-05-2022 A-egg 47,4 69,3 --      
  B-egg 47,1 69,2      
  C-egg 47 66,3 --  
sum nest: --
04-05-2022 adult Herring Gull breeding at nest  
   
09-05-2022 3 eggs
       
17-05-2022 3 eggs      
       
22-05-2022 3 eggs    
       
30-05-2022 2 eggs, and no chick found.
   
21-06-2022 2 eggs, rotten
   
nest 127-2023 same 2021-22
dam: dam 1 south
location: 2 mtr noord van (achter) nest 62, alleen zichtbaar vanaf noordzijde
breeders: teus x teus
OBSERVATIONS:
22-04-2023 eggs: 0x
03-05-2023 adult:  trapped adult at nest: r-7M.
eggs: 3x eggs
18-05-2023 eggs: 3x eggs
27-05-2023 pulli: 2x very small chicks, not ringed. 1x dead pullus in nest.
                   
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
teus 03-05-2023 6214905 r-7M nn. 416 113 47,7 19,2 4 Herring Gull female

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:
r-7.M (2024) teus teus 71,3 49,7 88,68 71,2 48,7 85,02 69,3 49,2 84,46 258,16
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 28-4-2024 26-5-2024
   
dam: dam 1 east
location: most eastern nest on dam 1. same as 2023, with white/red isolation foam
parents? same as 2023
   
ring pulli: 31-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
02-05-2024 r-7M .6214905 cluster 60-62-63 ZM F >4CY 410 804 110,7 45 63,5 21,1 5
                           
OBSERVATIONS:
31-03-2024 adult: r-7M on bread.
26-04-2024 eggs 1 egg, not measured.
02-05-2024 nest: 3 eggs, not measured.
adults: trapped r-7M Herring Gull (2023 adult).
05-05-2024 nest: 3 eggs.
14-05-2024 nest: 3 eggs.