Gull Research Organisation

Great Black-backed Gull (Larus marinus)

(last update: July 12, 2015)

Coordinators:
Jean-Michel Sauvage (France)
Morten Helberg (Norway)
Nils Helge Lorentzen (Norway)
Mars Muusse (Netherlands)

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Great Black-backed Gull 3cy September

Primary moult score of 3cy GBBG L. marinus. September 21 2002 - Boulogne/Mer, NW France (50.43N,01.37E). Bert-Jan Luijendijk & Mars Muusse.
P7 fully grown	7
P8 fully grown	1
P9 fully grown	0
P10 fully grown	0
n (sample size):	8
m (average):	7,1
SD (stand dev):	0,35
Notes: m (average) = number of fully grown new 3rd gen primaries. Fully grown score = tip of the feather exceeds the previous feather, even fractionally. 7x P7 fully grown, one bird with retained 2nd gen P10.

*Primary moult score of September 3cy GBBG L. marinus, birds in the section of this website. Ringed birds, (+ unringed in brackets).*
P6 fully grown	(1)	.
P7 fully grown	1 (+7)	NOS362734,
P8 fully grown	6	JH5R, JA420, JA640, JE464, JE539, JE576, DKC3092175
P9 fully grown	(1)	.
P10 fully grown	0	.
n (sample size):	16	.
m (average):	7,4	.
SD (stand dev):	0,73	.
Notes: m (average) = number of remaining old juvenile primaries. 8x P7 fully grown, one ringed bird with retained juvenile P10 (NOS362734) and two unringed bird.. One bird P6/P9.

marinus age scored against fully grown new primaries, September 21 2002, Boulogne-sur-Mer, NW France (on the roof).
.	p5 new	p6 new	p7 new	p8 new	p9 new	p10 new	m =	n =	SD =
2nd cy	-	-	2	6	2	-	8,0	10	0,67
3rd cy	-	-	7	1	-	-	7,1	8	0,35
4th cy	-	1	3	-	-	-	6,8	4	0,25
adult	35	40	-	-	-	-	5,4	82	0,65

Great Black-backed Gull (Larus marinus) NOS 362734 3cy: September 24 2004, IJmuiden, the Netherlands.
Mirror on 2nd generation P10 and white 3rd generation tail.

Great Black-backed Gull JH5R (Larus marinus) 3cy, September 26 2007, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.

Great Black-backed Gull JA420 (Larus marinus) 3cy: September 24 2010, Westkapelle, the Netherlands. Picture: M v Kleinwee.

Great Black-backed Gull (Larus marinus) 3cy JA640 September 11 2010, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.

Great Black-backed Gull (Larus marinus) JC055 3CY, May - September 2017, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.

Great Black-backed Gull JE464 (Larus marinus) 3cy: September 19 2011, Westkapelle, the Netherlands. Picture: M v Kleinwee.

Great Black-backed Gull (Larus marinus) 3cy JE539 September 11 2011, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.

Great Black-backed Gull (marinus) 2cy-3cy JE576 September 12 2011 & September 25 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.

Great Black-backed Gull (Larus marinus) JT477 3cy, September 24 2015, Boulogne-sur-Mer, France. Picture: Jean-Michel Sauvage.

Great Black-backed Gull (Larus marinus) JT724 2CY-3CY, February 2015 - September 2016, IJmuiden, the Netherlands.

Great Black-backed Gull (Larus marinus) JT811 2CY-3CY, July 2015 - September 2016, Boulogne-sur-Mer, France. Picture: Jean-Michel Sauvage.

Great Black-backed Gull (Larus marinus) JU153 2CY - 4CY, February 2015 - October 2017, the Netherlands.

Great Black-backed Gull (Larus marinus) JU754 1CY-3CY, December 2014 - September 2016, IJmuiden, the Netherlands.

Great Black-backed Gull (Larus marinus) JZ005 1CY & 3CY, October 2014 & September 2016, Zandvoort & IJmuiden, the Netherlands.

Great Black-backed Gull (Larus marinus) 3cy DKC 3092175 September 24 2012, Boulogne sur Mer, France. Picture Jean-Michel Sauvage.

Great Black-backed Gull (Larus marinus) NLA 7105682 3cy, September 24 2014, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.

Great Black-backed Gull (L. marinus) 8J9 3rd pre-basic moult (3CY), September 04 2015, High Head, North Truro, Barnstable County, Massachusetts. Picture: Steve Arena.

Great Black-backed Gull (Larus marinus), 3CY, September 24 2015, IJmuiden, the Netherlands.

Great Black-backed Gull (Larus marinus), 3CY, September 20 2015, IJmuiden, the Netherlands.

Great Black-backed Gull (Larus marinus), sub-adult, September 24 2015, IJmuiden, the Netherlands.

Great Black-backed Gull (Larus marinus), 3CY, September 24 2015, IJmuiden, the Netherlands.

Great Black-backed Gull (Larus marinus) 3cy: September 23 2011, Scheveningen, the Netherlands.