Larus cachinnans

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

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

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

Caspian Gull cachinnans F|X 1CY-4CY, May 2021 - July 2024, the Netherlands & UK. Picture: Ian Bartlett, Bethany Wilson, Albert de Jong, Thijs Horst & Mars Muusse.

Tibia B-F|X and metal NLA Arnhem 5.559.409, ringed as pullus Larus cachinnans on 28-05-2021 at nest 64 in colony Lelystad (Bataviahaven), Holland (NL 5230.00 N 525.00 E) - ringer Roland-Jan Buijs.
ID certain in 2021, both breeders are Caspian Gull cachinnans, y[PHSV] is 11CY and unringed adult partner.

Recoveries
14-10-2021, Cotesbach (waste dump), Leicestershire, ENGLAND (5.225,00 N 112,00 W) - Ian Bartlett
18-06-2022, Great Livermere, (Livermere Lakes), Suffolk, ENGELAND 5.218,00 N 45,00 E colourring read Bethany Wilson
17-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
26-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
26-03-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
02-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
08-06-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
28-06-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Leon Kelder
19-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse

Visits and data.

date:
24-04-2021	2 partners present, one is y[PHSV] and unringed adult. Nest allows trapping breeders, easily. 3 eggs in nest.
	egg no:	width (mm)	length (mm)	volume (cm3):	water test on April 24th:
	A egg	49,4	75,7	93,01	45 - tip bottom
	B egg	50,6	76,6	98,75	45 - tip bottom
	C egg	51,6	73,7	98,80	65 - tip bottom
			sum nest:	290,56

26-04-2021	Both partners present. Partner 2 with small black spot on primary coverts.

13-05-2021	Both partners present.
	1 chcick: 1,5 days old.
	1 chick: hatching
	1 egg: still in tact.

15-05-2021	1 chick: mass = 88 gr.
	1 chick: mass = 107 gr.
	1 egg just hatching.

28-05-2021		metal	tibia	mass	head + bill
	pull	.5559409	b-F\|X	>400	85
	pull	.5559410	b-F\|Y	>400	88,5
	pull	.5559411	b-F\|Z	>400	78,3
	Partner 2 has fishgear in beak.

08-06-2021	2 partners at nest. partner 2 has no longer hooked with fishline.

26-06-2021	No activity.

**below: Caspian Gull cachinnans F|X 4CY, July 19 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.**

below: Caspian Gull cachinnans F|X 3CY, March 17 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans F|X 2CY, June 18 2022, Livermere, England. Picture: Bethany Wilson.

below: Caspian Gull cachinnans F|X 1CY, November 14 2021, Cotesbach (waste dump), Leicestershire, ENGLAND (5.225,00 N 112,00 W). Picture: Ian Bartlett.