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)

gbbg rings
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gbbg 2cy January
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Great Black-backed Gull 2cy August

Primary moult score of 2cy GBBG L. marinus. Ringed birds in August on this website.
P5 fully grown . .
P6 fully grown 6 JE638, JW068, JYY90, NOS392988, 1VM, 1VV
P7 fully grown 13 J28S, J43A, JT724, JU144, JU818, JW999, JYJ90, NOS337783, SVS9158322, NLA7103227, DEH3112361, 3HH, 5T9
P8 fully grown 2 JE409, DKC3096165
P9 fully grown . .
n (sample size): 21 .
m (average): 6,8 .
SD (stand dev): 0,75 .

Notes:
m (average) = number of fully grown new 2nd gen primaries. Fully grown score = tip of the feather exceeds the previous feather, even marginally.

.

Primary moult score of 2cy GBBG L. marinus. Ringed birds in August on this website.
P9-P10 old 3 JE638, JYY90, 1VM
P10 old 8 JT724, JU818, JW068, JYJ90, SVS9158322, DEH3112361, NLA7103227, 1VV
no old P's 11 J28S, J43A, JE409, JU144, JW999, JX330, NOS337783, NOS392988, DKC3096165, 3HH, 5T9
n (sample size): 22 .
m (average): 0,6 .
SD (stand dev): 0,73 .

Notes:
m (average) = number of fully grown new 2nd gen primaries. Fully grown score = tip of the feather exceeds the previous feather, even marginally.

.

remaining 
1
2
3
4
5
6
7
7
8
8
9
10
11
12
remain/new P       
rem
rem
rem
rem
rem
rem
rem
new
rem
new
new
new
new
n(tot) 213
jan
feb
mrch
apr
may
june
july
july
aug
aug
sept
oct
nov
dec
0
.
.
.
.
.
.
1
.
11
.
.
.
.
.
1
.
.
.
.
.
.
.
.
8
.
.
.
.
.
2
.
.
.
.
.
1
3
.
3
.
.
.
.
.
3
.
.
.
.
.
8
4
.
.
.
.
.
.
.
4
.
.
.
.
2
10
.
.
.
.
.
.
.
.
5
.
.
.
.
4
.
.
5
.
.
.
.
.
.
6
.
.
.
1
4
.
.
2
.
6
.
.
.
.
7
.
.
.
.
6
.
.
.
.
13
3
.
.
.
8
.
.
.
.
2
.
.
1
.
2
4
2
1
.
9
.
.
.
2
.
.
.
.
.
.
14
5
4
.
10
31
32
24
5
.
.
.
.
.
.
.
6
6
7
n=
31
32
24
8
18
19
8
8
22
21
21
13
11
7
average m:
10,0
10,0
10,0
9,3
6,1
3,5
2,3
5,6
0,6
6,8
8,5
9,3
9,5
10,0
95% CID
0,00
0,00
0,00
1,16
0,61
0,29
0,87
0,89
0,32
0,27
0,34
0,45
0,46
0,00
inverse 
2,04
2,04
2,07
2,36
2,11
2,10
2,36
2,36
2,08
2,09
2,09
2,18
2,23
2,45
Variance (s2)
0,00
0,00
0,00
1,93
1,52
0,37
1,07
1,13
0,53
0,36
0,56
0,56
0,47
0,00
SD (s)
0,00
0,00
0,00
1,39
1,23
0,61
1,04
1,06
0,73
0,60
0,75
0,75
0,69
0,00
SE (sx) 
0,00
0,00
0,00
0,49
0,29
0,14
0,37
0,38
0,15
0,13
0,16
0,21
0,21
0,00
Percentage
0
0
0
0
0
0
0
13
0
50
0
0
0
0
0
1
0
0
0
0
0
0
0
0
36
0
0
0
0
0
2
0
0
0
0
0
5
38
0
14
0
0
0
0
0
3
0
0
0
0
0
42
50
0
0
0
0
0
0
0
4
0
0
0
0
11
53
0
0
0
0
0
0
0
0
5
0
0
0
0
22
0
0
63
0
0
0
0
0
0
6
0
0
0
13
22
0
0
25
0
29
0
0
0
0
7
0
0
0
0
33
0
0
0
0
62
14
0
0
0
8
0
0
0
0
11
0
0
13
0
10
19
15
9
0
9
0
0
0
25
0
0
0
0
0
0
67
38
36
0
10
100
100
100
63
0
0
0
0
0
0
0
46
55
100
% Controll
100
100
100
100
100
100
100
100
100
100
100
100
100
100

Notes:
Sample of only ringed birds for: Jan, Febr, Mrch, July, Aug, Sept, Oct, Nov, Dec.
Sample of unringed birds for May & June
Sample of mixed ringed and unringed birds for April.

 

 8248.jpg (78691 bytes)Great Black-backed Gull (Larus marinus) J28S 2cy: August 21 2003, IJmuiden, the Netherlands.
Ringed in Norway. P8 fully grown.
7698j43a.jpg (80496 bytes)Great Black-backed Gull (Larus marinus) J43A 2cy: August 11 2003, Boulogne/Mer, France (50.42 N - 01.34 E).
Ringed in Norway, also present in March this year.
8471j52c.jpg (85052 bytes)Great Black-backed Gull (Larus marinus) JC090 (2CY), August 20 2016, IJmuiden, the Netherlands.
8471j52c.jpg (85052 bytes)Great Black-backed Gull JE409 (Larus marinus)2cy, August 26 2010, Westkapelle, the Netherlands.
8471j52c.jpg (85052 bytes)Great Black-backed Gull JE638 (Larus marinus)2cy, August 10 2011, Skjoldnes, Farsund, Vest-Agder, Norway. Picture Nils Helge Lorentzen.
gbbgGreat Black-backed Gull (Larus marinus) JT724 2CY-3CY, February 2015 - September 2016, IJmuiden, the Netherlands.
7095jp36.jpg (66909 bytes)Great Black-backed Gull (Larus marinus) JU144 2CY, August 22 2015 , IJmuiden, the Netherlands. Picture: Maarten van Kleinwee.
gbbgGreat Black-backed Gull (Larus marinus) JU818 1CY-2CY, October 2014 - August 2015 , IJmuiden, the Netherlands.
gbbg Great Larus marinus) 2cy JW068 August 07 2011, IJmuiden, the Netherlands.
gbbg Great Larus marinus) 2cy JW999 August 25 2012, Boulogne/Mer, France (50.42 N - 01.34 E).
Ringed in Norway, also present in April this year.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) JX330 2CY, August 16 2014, Boulogne sur Mer, France. Picture Jean-Michel Sauvage.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) JYJ90 2CY, August 26 2014, Boulogne sur Mer, France. Picture Jean-Michel Sauvage.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) JYY90 2CY, August 12 2015, Stellendam, the Netherlands. Picture: Merijn Loeve.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) NOS 337783 2CY August 14 2013, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) NOS 392988 2cy: August 23 2012, Boulogne/Mer, France (50.42 N - 01.34 E).
Ringed in Norway, also present in June this year.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) SVS 9158322 2cy: August 15 2003, Westkapelle, the Netherlands.
Ringed in Sweden, Stockholm 9158322. P8 fully grown.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) DKC 3096165 2CY, August 13 2014, Boulogne sur Mer, France. Picture Jean-Michel Sauvage.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) DEH 3112361 2cy, August - September 2012, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage. Ringed on a ship in the North Sea.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus)2cy NLA 7.103.227 August 13 2008, IJmuiden, the Netherlands.
7095jp36.jpg (66909 bytes)Great Black-backed Gull (Larus marinus) 1VM 2CY, August 23 2014, Howth, Ireland. Picture: Graham Prole.
7095jp36.jpg (66909 bytes)Great Black-backed Gull (Larus marinus) 1VV 1CY-3CY, November 2013 - July 2015, Dublin, Ireland. Picture: Graham Prole & Stephen Lawlor.
7095jp36.jpg (66909 bytes)Great Black-backed Gull (Larus marinus) 3HH 2CY, August 23 2014, Bulloch Harbour, Ireland. Picture: Graham Prole.
9101.jpg (76303 bytes)Great Black-backed Gull (L. marinus) 0Y4 2nd pre-basic moult (2CY), August 21 2015, Race Point - Hatches Harbor, Provincetown, Barnstable County, Massachusetts. Picture: Steve Arena.
9101.jpg (76303 bytes)Great Black-backed Gull (L. marinus) 2Y4 2nd pre-basic moult (2CY), August 12 2015, Race Point - Hatches Harbor, Provincetown, Barnstable County, Massachusetts. Picture: Steve Arena.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 5T9 1cy-3cy, August 27 2011 - June 29 2013, Sandy Point - Plum Island, Ipswich, MA. 
7662.jpg (51643 bytes)Great Black-backed Gull (Larus marinus) 2CY, August 14 2016, Brouwersdam, the Netherlands.
7662.jpg (51643 bytes)Great Black-backed Gull (Larus marinus) 2cy August 29 2012, IJmuiden, the Netherlands.
7662.jpg (51643 bytes)Great Black-backed Gull (Larus marinus) 2cy August 29 2012, IJmuiden, the Netherlands.
7662.jpg (51643 bytes)Great Black-backed Gull (Larus marinus) 2cy August 29 2012, IJmuiden, the Netherlands.
gbbgGreat Black-backed Gull (Larus marinus) 2CY, August 04 2015, IJmuiden, the Netherlands.
gbbgGreat Black-backed Gull (Larus marinus) 2CY, August 05 2015, IJmuiden, the Netherlands.
gbbgGreat Black-backed Gull (Larus marinus) 2CY, August 15 2015, IJmuiden, the Netherlands.
gbbgGreat Black-backed Gull (Larus marinus) 2CY, August 15 2015, IJmuiden, the Netherlands.
gbbgGreat Black-backed Gull (Larus marinus) 2CY, August 15 2015, IJmuiden, the Netherlands.
gbbgGreat Black-backed Gull (Larus marinus) 2CY, August 15 2015, IJmuiden, the Netherlands.
7662.jpg (51643 bytes)Great Black-backed Gull (Larus marinus) 2cy August 29 2012, IJmuiden, the Netherlands.
7662.jpg (51643 bytes)Great Black-backed Gull (Larus marinus) 2cy August 29 2012, IJmuiden, the Netherlands.
8471j52c.jpg (85052 bytes)Great Black-backed Gull (Larus marinus) 2CY, August 20 2016, IJmuiden, the Netherlands.
7662.jpg (51643 bytes)Great Black-backed Gull (Larus marinus) 2cy August 29 2012, IJmuiden, the Netherlands.
7662.jpg (51643 bytes)Great Black-backed Gull (Larus marinus) 2cy August 29 2012, IJmuiden, the Netherlands.
7662.jpg (51643 bytes)Great Black-backed Gull (Larus marinus) 2cy August 29 2012, IJmuiden, the Netherlands.
9149.jpg (76564 bytes)Great Black-backed Gull (Larus marinus) 2cy: August 10 2009, IJmuiden, the Netherlands.