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|+

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|+ positioned on dam 2: east at blocks, 15 mtr W of y-XCHP, low at dam 2.
  • ID certain in 2023: male is 4CY n-F|+ and partner is sub-adult female cachinnans.
  • ID certain in 2024: male is 5CY n-F|+ and partner is adult female cachinnans.
location April 27 2023: 3 eggs. April 27 2023: nest at dam 2. .
   
  April 21st, 2024: nest n-F|+ now at dam 1. April 21st, 2024: 3 eggs. April 21st, 2024: situation at cluster.
 
partner 1 April 09 2023: n-F|+. April 09 2023: n-F|+. March 26 2024: male n-F|+.
 
partner 1 March 26 2024: male n-F|+. April 30 2024: trapped male n-F|+. .
   
partner 2 May 13 2023: Caspian Gull. May 13 2023: Caspian Gull. May 13 2023: Caspian Gull.
 
chicks May 31 2024: chick g-C|2. May 31 2024: chick g-C|3. June 04 2024: fish bolus from g-C|2.
 

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 n-F|+ 2023 69,3 46,6 75,77 67,4 47,1 75,28 67,3 47 74,85 225,91 new nest
ring pulli: May 18 laying A egg: April 13 hatch A egg: May 11
   
n-F|+ 2023 New nest
dam: dam 2 east, blacks
location: 20 mtr SW of nest 55, 15 mtr W of XCHP, low at dam 2. In front of wood. Red spot sprayed.
breeders: cach x cach
OBSERVATIONS:
27-04-2023 nest: 3 eggs measured. Water test. A: 90 - tip bottom
adult: breeding adult cachinnans is n[F|+]. B: 60 - tip bottom
30-04-2023 adult: partner is also cachinnans. C: 80 - tip bottom
n-F|+ at nest.
13-05-2023 adult: n-[F|+] & partner are immatures.
18-05-2023 nest: 1 egg hatching, no chicks found
27-05-2023 pulli: 1x chick dead in nest, age 1 day. No other chicks found. Several dead chicks in this section (55, XCHP, n-F|+).
25-06-2023 adult: not present, no birds here.

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|+ 2024 cach cach 74,6 48,6 88,72 72,1 50 90,76 70,7 47 78,63 258,11
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  3 16-4-2024 14-5-2024
   
dam: dam 1 south
location: dam 1 south, near cluster nest 60, but 5 mtr S, at Blackberry edge.
parents? n-F|+-2023 was at dam 2. Now new breeder at dam 1.
   
ring pulli: 18-May
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
30-04-2024 n-F|+ .5552921 Dam 1 PONT M 5CY 464 1180 135 60,3 71 19,6 5
31-05-2024 g-C|2 .5631128 N-F|+ PONT 1CY              
31-05-2024 g-C|3 .5631129 N-F|+ PONT 1CY              
04-06-2024 g-C|2 .5631128 N-F|+ PONT 1CY 127   91,9        
04-06-2024 g-C|3 .5631129 N-F|+ PONT 1CY 220 809 108,7        
                           
OBSERVATIONS:
12-04-2024 eggs: no nest found.
21-04-2024 eggs: 3 eggs, measured.
nest: cluster again: 60, 69, PAM0, n-F|+, and 2 Herrings to follow soon.
30-04-2024 adults: trapped n-F|+.
02-05-2024 eggs: 3 eggs.
05-05-2024 nest: 3 eggs, not measured.
14-05-2024 nest: 2 eggs, no chick found in dense vegetation.
31-05-2024 chicks: 2x ringed.
04-06-2024 chick: g-C|2 & C|3 present. measured.
  food: fish bolus.