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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Nests at Lelystad 2022
nest y-PNED
nest y-PHSV / r-CG
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X540
nest y-XCHP
nest w-327:U
nest n-F|N
nest r-6A
nest r-6B
nest r-6C
nest r-CS
nest r-FC
nest w-8Z
nest zy-MT
nest 003
nest 011
nest 012
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 058
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 109
nest 111
nest 112
nest 113
nest 117Z
nest 118Z
nest 123Z
nest 124Z
nest 125Z
nest 126Z
nest 127Z
nest 128Z
nest 129Z
nest 131Z
nest 132 YLG
nest 133
nest 134
nest 135
nest 136
nest 137
nest 138
nest 139
nest 143Z
nest 203
nest 204
nest 207
nest 222Z
nest 227
nest 228Z
nest 229
nest 230Z
nest 231
nest 240Z
nest 244
nest 245Z

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 hybrid - nest Lelystad y-X71A

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 y-X71A positioned in section dam 1 south. Nest at edge of Blackberry complex, at transition to tarmac dam, about 25 meters west of nest n-F|N.
    In 2023 approx at same location.
  • ID uncertain in 2022, one partner is male hybrid cachinnans y-X71A. Partner most likely Herring Gull.
  • ID uncertain in 2023, one partner is male hybrid cachinnans y-X71A. Partner is Herring Gull.
  • ID uncertain: this year no observations of y-X71A.
location May 4th, 2022: 3 eggs at nest. May 4th, 2022: nest location. May 4th, 2022: y-X71A at nest.
 
partner 1 May 4th, 2022: y-X71A at nest. May 4th, 2022: y-X71A at nest. May 1st, 2022: y-X71A with possible Herring Gull partner.
 
  April 11th, 2022: male is hybrid Caspian Gull y-X71A. April 15th, 2022: male is hybrid Caspian Gull y-X71A. April 27th, 2022: male is hybrid Caspian Gull y-X71A.
 
  April 27th, 2023: 6CY male is hybrid Caspian Gull y-X71A. April 9th, 2023: 6CY male is hybrid Caspian Gull y-X71A. .
   
partner 2 April 09 2023: partner is female Herring Gull. April 09 2023: partner is female Herring Gull. .
   
food May 30th, 2022: food is Eel. . .
     

Visits and data:
Estimation egg laying: A-egg = April 26 2022. Estimating hatching = May 24 2022.

date            
27-04-2022 Again, y-X71A standing high on dam, guarding the area.
  Nest located here with 1 egg. Label: nest 119Z (part of control group Herring Gulls).
  1 egg egg no: width (mm) length (mm) volume (cm3):  water test on April 27th: 
    A egg 51,2 71,2 -- 00 - tip on bottom
             
01-05-2022 y-X71A standing high on dam, about 25 meters from nest 61, near 119Z. y-X71A classified as male cachinnans hybrid..
             
04-05-2022 y-X71A steps from nest, was breeding. Code 119Z sprayed near nest.
  3 eggs egg no: width (mm) length (mm) volume (cm3):  water test on May 4th: 
    A egg 51,2 71,3 -- --
    B egg 47,7 68,8 -- --
    C egg 47,5 65,8 -- --
   
09-05-2022 3 eggs.
   
17-05-2022 3 eggs.
   
22-05-2022 3 eggs. First crack in shell. Decided not to try to trap adult at nest. y-X71A present.
   
30-05-2022 1 chick present: chick r-5+ (which belongs to nest 117Z). No chicks of nest 119Z found in vegetation.
  food: large Eel (25 cm's) next to nest. No sign of adults.
   
  In 2022 no chicks ringed in this nest and no data on fledging.
 
 
 
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?
hybrid x teus X71A 73,4 51 96,12 73,2 50,8 95,11 70,8 48,4 83,51 274,74 same as 2022
ring pulli: 20-mei laying A egg: -- hatch A egg: --
 
X71A 122-2023
dam: dam 1 west
location: Coded 122 on tarmac, nest is next to sprayed white spot
breeders: hybrid x teus
OBSERVATIONS:
05-04-2023 adult:  yX71A present.
09-04-2023 nest:  seems ready.
adult:  Male is yX71A, female is teus. Guarding on top of dam.
22-04-2023 nest:  3 eggs, watertest: tip at bottom 70, 50, 20 degrees respectively.
27-04-2023 adult:  Male is yX71A, female is argenteus. Guarding on top of dam.
03-05-2023 adult:  Cage on nest 119 border tarmac-vegetation (was location 119-2022). Now trapped a LBBG here.
X71A moved to location 122-2022? In retrospect: yes.
25-06-2023 adult:  X71A present on dam, unknown if he has any chicks.

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:
119-2024 teus teus 65,1 48,6 77,42 67,5 47,7 77,33 0,00  
  # eggs A-egg hatch # ringed chicks # all chicks # fledged chicks comments
  2    
   
dam: dam 1 south
location: dam 1 western section, nest 119-2023, was y-X71A in 2023
parents? one same as 2023?
   
ring pulli: June 03?
date darvic metal location / nest# species sexe age wing mass head+ bill bill tarsus gonys greyscale
                           
OBSERVATIONS:
05-05-2024 eggs 2x, measured.