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)

Great Black-backed Gull 2cy July

Primary moult score of 2cy GBBG L. marinus. Ringed birds in July on this website.
P5 fully grown 5 JT811, JW068, 5T9, DKC3M3220, 44S
P6 fully grown 2 JYY47, R739
P7 fully grown 0 .
P8 fully grown 1 JT631
P9 fully grown . .
n (sample size): 8 .
m (average): 5,6 .
SD (stand dev): 1,06 .

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 July on this website.
P7-P10 old . .
P8-P10 old 4 JW068, 5T9, DKC3M3220, 44S
P9-P10 old 3 JT811, JYY47, R739
P10 old 0 .
no old P's 1 JT631
n (sample size): 8 .
m (average): 2,3 .
SD (stand dev): 1,04 .

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

8210.jpg (74296 bytes)Great Black-backed Gull (Larus marinus) 2y CZD July 07 2009, Boulogne / Mer, France.
gbbgGreat Black-backed Gull (Larus marinus) JE410 2cy-7cy, July 2010 - October 2015, France & the Netherlands. Picture Jean-Michel Sauvage & Mars Muusse.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) JT631 2cy, July 30 2014, IJmuiden, the Netherlands.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) JT811 2CY, July & October 2015, Boulogne-sur-Mer, France. Picture: Jean-Michel Sauvage.
gbbg Great Black-backed Gull (Larus marinus) 2cy JW068 July 01 2011, IJmuiden, the Netherlands.
8471j52c.jpg (85052 bytes)Great Black-backed Gull (Larus marinus) JYY47 1CY-2CY, November 2014, February-December 2015, Scheveningen, the Netherlands.
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. 
9101.jpg (76303 bytes)Great Black-backed Gull (L. marinus) 5Y9 2nd pre-basic moult (2CY), July 25 2015, Race Point, Provincetown, Barnstable County, Massachusetts. Picture: Steve Arena.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) DKC 3M3220 2CY, July & September 2015, Boulogne-sur-Mer, France. Picture: Jean-Michel Sauvage.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) R739 2CY, July 09 2015, Stellendam, the Netherlands. Picture: Pim Wolf.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 44S 2CY, October 2014 & July 2015, Boulogne sur Mer, France. Picture Jean-Michel Sauvage.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 2cy, July 09 2013, Katwijk, the Netherlands.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 2CY, July 30 2014, IJmuiden, the Netherlands.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 2CY, July 30 2014, IJmuiden, the Netherlands.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 2CY, July 30 2014, IJmuiden, the Netherlands.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 2CY, July 30 2014, IJmuiden, the Netherlands.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 2CY, July 30 2014, IJmuiden, the Netherlands.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 2CY, July 30 2014, IJmuiden, the Netherlands.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 2CY, July 30 2014, IJmuiden, the Netherlands.
9101.jpg (76303 bytes)Great Black-backed Gull (Larus marinus) 2CY, July 30 2014, IJmuiden, the Netherlands.