Great Black-backed Gull (Larus marinus)

(last update: October 12, 2011)
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.

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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.

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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

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 nos362734.jpg (86898 bytes)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.
8471j52c.jpg (85052 bytes)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.
1598.jpg (74227 bytes)Great Black-backed Gull JA420 (Larus marinus) 3cy: September 24 2010, Westkapelle, the Netherlands. Picture: M v Kleinwee.
8471j52c.jpg (85052 bytes)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.
1598.jpg (74227 bytes)Great Black-backed Gull JE464 (Larus marinus) 3cy: September 19 2011, Westkapelle, the Netherlands. Picture: M v Kleinwee.
gbbgGreat Black-backed Gull (Larus marinus) 3cy JE539 September 11 2011, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.
gbbgGreat Black-backed Gull (marinus) 2cy-3cy JE576 September 12 2011 & September 25 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
gbbgGreat Black-backed Gull (Larus marinus) 3cy DKC 3092175 September 24 2012, Boulogne sur Mer, France. Picture Jean-Michel Sauvage.
9149.jpg (76564 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 23 2011, Scheveningen, the Netherlands.
9149.jpg (76564 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 23 2011, Scheveningen, the Netherlands.
9149.jpg (76564 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 23 2011, Scheveningen, the Netherlands.
9149.jpg (76564 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 23 2011, Scheveningen, the Netherlands.
9149.jpg (76564 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 23 2011, Scheveningen, the Netherlands.
6195.jpg (63934 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 17 2001, Bergen op Zoom, the Netherlands (51.32 N - 04.26). Two images.
Most of the coverts and scapulars are blackish now. Primary P7 is fully grown.
2602.jpg (78918 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 24 2004,  IJmuiden, the Netherlands.
Primary P7 is fully grown while P10 still has to be shed.
2607.jpg (80867 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 24 2004,  IJmuiden, the Netherlands.
Primary P7 is fully grown. White tail.
2610.jpg (76387 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 24 2004,  IJmuiden, the Netherlands.
Primary P7 is fully grown while P10 still has to be shed.
2620.jpg (78084 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 24 2004,  IJmuiden, the Netherlands.
Very immature plumage, even in the scapulars.
6454.jpg (75822 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 30 2001, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E).
The general appearance in autumn: a dark blackish saddle created by the replaced scapulars and mantle, old variegated tertials, greater coverts and lesser coverts. The new inner median coverts are completely black.
6453.jpg (77573 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 30 2001, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E).
Again a dark blackish saddle created by the replaced scapulars and mantle, old variegated tertials, greater coverts and lesser coverts.
6464.jpg (49974 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 30 2001, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E).
Typical head pattern of 3cy Great Black-backed Gull.
6468.jpg (75557 bytes)Great Black-backed Gull (Larus marinus) 3cy: September 30 2001, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E).
A few greater and median coverts have been replaced for all-black new feathers. Note the old barred and variegated upper tertials, greater, median and lesser coverts and a few abraded brown scapulars.