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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Lelystad 2023:
nest y-PNED
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X60J
nest y-XCHP
nest w-327:U
nest n-F|6
nest n-F|8
nest n-F|+
nest n-F|N
nest r-6.B
nest r-7.P
nest r-C.G
nest w-8Z
nest 003
nest 006
nest 013
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 033
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 108
nest 109
nest 111
nest 112
nest 127Z
nest 131Z
nest 132 YLG
nest 135
nest 139
nest 147Z
nest 163
nest 167
nest 168
nest 204
nest 206
nest 207
nest 223
nest 227
nest 230Z
nest 231
nest 244Z
nest 245Z
nest 248
nest 251
nest 252
nest 253
nest 254
nest 255Z
nest 256Z
nest 262

Cachinnans - nest Lelystad n-F|8

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 n-F|8 positioned on dam 2: central, 8 mtr NW of 17, only visible from N side.
  • ID certain in 2023: male is 4CY n-F|8 and partner is adult female cachinnans.
  • ID certain in 2024: male is 5CY n-F|8 and partner is adult female cachinnans.
eggs: April 21st, 2024: 1 egg. March 31 2024: n-F|8 & partner at nest.

April 23rd, 2024: orange crate.
 
partner 1 April 27 2023: n-F|8 at dam 2. April 27 2023: n-F|8 at dam 2. May 13 2023: n-F|8.
 
  May 13 2023: n-F|8. March 25 2024: n-F|8.

April 23rd, 2024: n-F|8.
 
 

April 23rd, 2024: n-F|8.

April 23rd, 2024: n-F|8.

 .
   
partner 2 March 25 2024: n-F|8 & unringed partner.

April 23rd, 2024: female partner n-F|8.

 .
   
pullus Fledged juvenile g-7|Y, June 25 2023. Fledged juvenile g-8|A, June 25 2023. May 31 2024: chick g-C|8.
 
food May 14th, 2024: fish prey = Goby. . .
     

Visits and data:

egg sizes & volume 2023
SPECIES NEST A_length A_width A_volume B_length B_width B_volume C_length C_width C_volume TOTAL NEST: known parents?
cach x cach nF|8 72,2 52,2 99,06 71,1 49,1 86,30 71 51,1 93,35 278,71 new nest
ring pulli: -- laying A egg: -- hatch A egg: --
 
catch: date: metal: darvic: mass: wing: head+bill:      
Pullus 18-05-2023 5.556.417 g-7|Y 163 -- 64,3
Pullus 27-05-2023 5.556.417 g-7|Y 470 -- --
Pullus 27-05-2023 5.625.191 g-8|A 487 -- --
 
n-F|8
dam: dam 2 central.
location: Dam 2 central, 8 mtr NW of 17, only visible from N side. Behind red crate, close to bushes. Code sprayed.
breeders: cach x cach
OBSERVATIONS:
27-04-2023 adult:
30-04-2023 nest: 3 eggs. Measured. Watertest: A: 1 mm - floating
adult: nF8 breeding. Later: unringed partner. Both large birds. B: 2 mm - floating
11-05-2023 nest: 3 eggs hatching C: 1/2 way - floating
18-05-2023 pulli: 1 chick ringed, other 2 not found
27-05-2023 pulli: 1x control, 1x new chick ringed
25-06-2023 pulli: g-7|Y, g-8|A and n-F|8 present

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:
n-F|8 2024 cach cach 72 50,2 91,36 0,00 0,00 91,36
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 21-4-2024 19-5-2024
   
dam: dam 2 central
location: is n-F|8 - 2023, orange crate
parents? n-F|8 and partner 2023?
   
ring pulli: 24-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
31-05-2024 g-C|8 .5631132 n-F|8 PONT 1CY              
                           
OBSERVATIONS:
25-03-2024 adult: n-F|8 near nest site 2023.
31-03-2024 adult: n-F|8 & partner near nest site 2023.
21-04-2024 eggs: 1 egg, measured
23-04-2024 adult: n-F|8 & partner near nest.
26-04-2024 eggs: still only 1 egg.
07-05-2024 nest: 1 tiny chick, not ringed.
14-05-2024 nest: no chick found.
food: 2x Round Goby & 1x Perch.
31-05-2024 chicks: 1x ringed. Is only chick.
18-06-2024 nest: 2x adults present. g-C|8 dead. Failed season.