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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Project Info
International trend
National trend
Site characteristics
Breeding biology
Fecundity
Food resources
Nonbreeding season
Breeding species
Hybrid scores
Ring codes
Future

Lelystad 2020:
nest 001
nest 002 yPNED
nest 003
nest 005 yPLDP
nest 006 yPESV
nest 008 gXLDT
nest 009
nest 011
nest 012
nest 013
nest 014
nest 015
nest 016
nest 017
nest 018
nest 021
nest 025
nest 027
nest 028
nest 029
nest 031
nest 032
nest 033
nest 034
nest 035
nest 036
nest 037
nest 038
nest 039
pair A
pair B

Lelystad 2021
nest y-PNED
nest y-PLDP
nest y-PHSV
nest y-P:A02
nest y-P:U60
nest zy-MT
nest r-FB
nest r-FC
nest 001
nest 003
nest 006
nest 011
nest 012
nest 013
nest 014
nest 015
nest 016B
nest 017
nest 018
nest 019
nest 021
nest 034
nest 035
nest 038
nest 040
nest 041
nest 042
nest 044
nest 045
nest 046
nest 047
nest 048
nest 053
nest 055
nest 056
nest 058
nest 060
nest 062
nest 063
nest 065
nest 066
nest 067
nest 072

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 x argenteus - nest Lelystad 006

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 006 positioned on artificial breakwater 1 at T-split. Location is nest PLDP - 2020 (in 2021, PLDP moved to nest PESV).
    In 2023 location used by mixed pair Caspian Gull & Herring Gull.
  • Certainty on ID in 2021, breeders are male Caspian Gull cachinnans and female Herring Gull argenteus.
  • Certainty on ID in 2023, breeders are male Caspian Gull cachinnans and female Herring Gull argenteus.
location April 16th, 2021: male cach & female teus. May 6th, 2021: male cach & female teus. April 16th, 2021: male cach & female teus.
 
  April 27th, 2023. Caspian x Herring nest. April 27th, 2023. Caspian x Herring nest. .
   
  April 27th, 2023. Caspian "almost thayeri P10". April 27th, 2023. Caspian "almost thayeri P10". April 27th, 2023. Caspian "almost thayeri P10".
 
pulli May 28th, 2021: pullus, likely wrong nest. June 8th, 2021: too many cachinnans! .
   

Visits and data.

date:  
16-04-2021 Two adult at nest, photographed. Nest without eggs. Many Spoonbills breeding here, hampering visits in future.
   
24-04-2021 Correction on flag code. Now labeled "6". Nest abandoned, no eggs?
   
26-04-2021 No visit, Camilla is trapping a Spoonbill.
   
06-05-2021 egg no: width (mm) length (mm) volume (cm3):  water test on May 6th: 3 eggs in nest
  A egg 49,2 68,7 83,73 25 - tip at bottom
  B egg 50,7 71,7 92,80 30 - tip at bottom
  C egg 51,9 71,5 96,97 55 - tip at bottom
      sum nest: 273,50
       
15-05-2021 2 eggs in nest. Nest located at 'the flat stone' in dense, inaccessible Blackberry complex.
       
28-05-2021   metal tibia mass (gr) head + bill (mm)
  pullus .5559419 -- -- -- Chick is 1 day old. Only metal ringed. No certianty about species.
  1 egg: just hatching.
  In retrospect: this nest was situated 'too high' at dam 1, likely different nest. Hybrid nest is situated at flat stone, lower and central at dam (see May 15th).
       
08-06-2021 Sitiuation not clear: several cachinnans and argenteus here guarding 3 large chicks. Favorite place for chicks at the blocks near waterfront, below Blackberry complex.
 
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 teus 6-2023 71,2 49,7 88,55 69,7 49,2 84,95 69,7 47,4 78,85 252,35 New nest.
   
6-2023 OLD LOCATION PESV
dam: dam 1 T-split
location: old nest yPESV, N of Elder bush (Vlierstruik), visible from West.
breeders: cach x teus
OBSERVATIONS:
09-04-2023 1 adult Guarding cach type with yellow legs.
27-04-2023 adult: 1x teus and 1x cach at nest location. Quickly returning. Should check for nest here.
Check cach from pictures 2022: this is a known bird (the 'almost thayeri'.)…
13-05-2023 adult: again, the cach with limpy left leg.
27-05-2023 nest: 3 eggs measured.