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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Breeding biology
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Nests at 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-6B
nest r-CG
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 154
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

 

Caspian Gull cachinnans hybrid 8.+ 1CY, May - September 2023, Lelystad & Amsterdam, the Netherlands. Picture: Jan Zorgdrager, Thijs Horst & Mars Muusse.

Tibia ring R-8|+ and metal NLA 5.556.485, ringed as pullus Larus cachinnans hybrid (L. argentatus x L. cachinnans) on May 18 2023 in nest 154 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.

Recoveries:
20-9-2023 Amsterdam-Westpoort (Vuilverwerking), Noord-Holland, NL 5.224,00 N 451,00 E colourring read Jan Zorgdrager

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 154-2023 74,6 51 97,70 70,6 51,9 95,75 55,2 50,5 70,88 264,33 NEW NEST
ring pulli: laying A egg: hatch A egg
 
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
adult 03-05-2023 6214907 r-7.P nn 449 137,2 62,2 21,3 7 male cachinnans.
pullus 18-05-2023 5556485 r-8.+ 124 56
pullus 27-05-2023 5556485 r-8.+ 329
   
154-2023 NEW NEST
dam: dam 1 west
location: most western nest selected in 2023 at dam 1.
breeders: cach x teus
OBSERVATIONS:
22-04-2023 nest: 3 eggs, water test: flat bottom - 3 times (recently laid).
27-04-2023 adult: Male cachinnans & female argenteus. Female breeding.
03-05-2023 adult: Trapped male cach at nest: r-7.P
13-05-2023 adult: Cach r-7P guarding, female teus incubating.
18-05-2023 pullus: 1 chick ringed, other 2 not found
27-05-2023 pullus: 1x control chick.

below: Caspian Gull cachinnans hybrid 8.+ 1CY, September 20 2023, Amsterdam, the Netherlands. Picture: Jan Zorgdrager.

below: Caspian Gull cachinnans hybrid 8.+ 1CY, May 27 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 8.+ 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.