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 g-A|3 (56)

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 056 positioned high on breakwater dam 2, near black table (flotsam and jetsam nearby nest), hence nest called "black table nest".
  • ID certain in 2021, both parent's characteristics match pure Caspian Gull cachinnans.
  • ID certain in 2024, both parent's Caspian Gull cachinnans. Trapped female in May 2024, now g-A|3.
location Nest "black table" on top of dam April 26th, 2021. Nest April 24th, 2021: 3 eggs clutch. Nest 15th, 2021: 1 hatched chick & 2 eggs.
 
  April 21st, 2024: full clutch, with 3 eggs. April 21st, 2024: full clutch, with 3 eggs. .
   
partner 1 April 24th, 2021: cachinnans parent, moulting. April 24th, 2021: cachinnans parent, moulting. April 24th, 2021: cachinnans parent, moulting.
 
partner 1 April 26th, 2021: cachinnans parent, moulting. April 21st, 2024: cachinnans male. April 21st, 2024: cachinnans male.
 
partner 1 April 23 2024: cachinnans male. April 23 2024: cachinnans male. April 23 2024: cachinnans male.
 
partner 2 May 13th, 2021: cachinnans parent. May 13th, 2021: cachinnans parent. April 21st, 2024: cachinnans female.
 
  May 7th, 2024: cachinnans female, now g-A|3. May 02 2024: female cachinnans. May 02 2024: female cachinnans.
 
chicks May 31 2024: chick g-C|9. . .
     

Visits and data 2021.

date            
16-04-2021 Patrolling adult and landing at location. We did not climb the dam to search.
24-04-2021 3 eggs egg no: width (mm) length (mm) volume (cm3):  water test on April 24th: 
    A 50,5 71,1 91,30 20 - flat on bottom
    B 49,8 67,2 83,91 30 - flat on bottom
    C 48,4 63,3 74,66 20 - flat on bottom
    sum nest: 249,87  
26-04-2021 Moulting parent attacks from nest and start patrolling.
13-05-2021 Partner 2 at nest and aggressive. Do they have chicks maybe?
15-05-2021 2 eggs in nest.
  1 hatched chick (1 day old). Mass = 61 gr.
28-05-2021 1 egg rotten in nest.
  Alarming parent, but chicks not found in dense vegetation, despite intense search.
08-06-2021 No birds present.
26-06-2021 No chicks found.

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:
g-A|3 cach cach 74,5 48 86,42 71,7 49,5 88,46 71,9 49,2 87,63 262,51
056-2024 # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 10-4-2024 8-5-2024
   
dam: dam 2 east
location: was Black table 2020/2021, 15 mtr E of 17B, now with white jerrycan. Deep in Blackberries.
parents? New?
   
ring pulli: 12-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
07-05-2024 g-A|3 .5631237 56 black table PONT F >4CY 449 1030 131,5 60,1 71,2 20,3 7
31-05-2024 g-C|9 .5631130 56 black table PONT 1CY              
                           
OBSERVATIONS:
21-04-2024 eggs: 3 eggs, measured. 
adult: 2x Caspian Gull: incubating and guarding.
02-05-2024 eggs: 3 eggs.
07-05-2024 adult: 1x trapped at nest. Food: pork chop & chicken drumstick (likely landfill feeder)
14-05-2024 nest: all eggs hatched.
chicks: 2x heard in vegetation, but not found. No ringed.
31-05-2024 chicks: 1x ringed.
04-06-2024 nest: no chick found.
18-06-2024 chick: CONTROLL: g-C|9.