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
Fecundity
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Nonbreeding season
Breeding species
Hybrid scores
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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 7|J 1CY, May - September 2023, the Netherlands. Picture: Leon Kelder, Casper Swiebel, Thijs Horst & Mars Muusse.

Tibia ring G-7|J and metal NLA 5.556.401, ringed as pullus Larus cachinnans on May 18 2023 in nest 139 at Lelystad, the Netherlands. Ringed by Roland-Jan Buijs ringing team.

Recoveries:
09-08-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
22-09-2023 Almere (Oostvaardersplassen), Flevoland, NL 5.226,00 N 517,00 E colourring read Casper Swiebel

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 139 74,2 51 97,17 74,2 49,7 92,28 72,7 50,7 94,09 283,55 same as 2022
ring pulli: May 12. laying A egg: April 7. hatch A egg: May 5.
     
catch: date: metal: darvic: mass: wing: head+bill: bill: gonys: greytone:
Pullus 18-5-2023 5556401 G-7|J 161 -- 66 --
Pullus 18-5-2023 5556402 G-7|K 116 -- 57,4 --
 
139-2023
dam: dam 1 east
location: easternmost nest with yellow/black flag. On N side with red/white foam.
breeders: cach x cach
OBSERVATIONS:
04-04-2023 adult:  1x cachinnans guarding and at nest
09-04-2023 nest:  no eggs, nest is ready. Y/B flag near nest.
adult:  1x cachinnans guarding and at nest
26-04-2023 adult:  breeding cachinnans
eggs: 3x egg, measured A 80 - punt bodem
B 60 - punt bodem
C 90 - punt bodem
13-05-2023 adult: male and female are cachinnans.
18-05-2023 pulli: 2 chicks ringed, 3rd not found
27-05-2023 pulli: dense vegetation, nothing found.
25-06-2023 pulli: g-7|K and g-7|J present

below: Caspian Gull cachinnans 7|J 1CY, September 22 2023, Almere, the Netherlands. Picture: Casper Swiebel.

below: Caspian Gull cachinnans 7|J 1CY, September 11 2023, Wervershoof, the Netherlands. Picture: Leon Kelder.

below: Caspian Gull cachinnans 7|J 1CY, August 09 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|J 1CY, July 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|J 1CY, July 15 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|J 1CY, July 08 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans 7|J 1CY, June 25 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans 7|J 1CY, May 18 2023, Lelystad colony, the Netherlands. Picture: Thijs Horst.