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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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

Cachinnans - nest Lelystad 001

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 001 positioned high on artificial breakwater in reedbed, between some small Elderberry bushes and dense Blackberry vegetation.
• ID in 2020 uncertain, presumed breeders are Caspian Gull cachinnans adult x Yellow-legged Gull michahellis 4CY.
• Nest in dense cluster of several nests; from the water it proved to be difficult to pin down the parents for this particular nest in 2020.
• ID in 2021 uncertain, adult female is pure Caspian Gull cachinnans, adult male most likely Caspian Gull cachinnans too.

location	Nest in vegetation.	April 26th, 2021: nest location.	April 26th, 2021: nest location.
eggs	Eggs April 15th, 2020: 2 eggs clutch.	Eggs April 27th, 2020: 3 eggs clutch.
partner 1 2020	date: ? (presumed nest 1 breeder).	June 02 2020, micha-type at nest or neighbour?	.
partner 1 2021	April 26th, 2021: male.	April 26th, 2021: male.	.
partner 2	date: ? (uncertain nest 1 breeder).	date: ? (uncertain nest 1 breeder).	April 15th, 2020 (uncertain nest 1 breeder).
partner 2 2021	April 26th, 2021: female.	April 26th, 2021: female.	April 26th, 2021: female.
pullus	May 21st, 2020 pullus n[F|Y].	.	.

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