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 (Larus marinus) JT631 2nd cycle (2CY), July 30 2014 & December 20 2014, IJmuiden, the Netherlands.

CR-Code Black ring with white code: JT631 LBNW(JT631);RBM
Ringing Centre Stavanger Museum (Norway) Ring number 3039271
Species Great Black-backed Gull  Larus marinus
Sex Unknown Age Pullus

Date

Place

Coordinates

Observers

Days/km/°

04.07 2013

Hummerholmen, Lindesnes, Vest-Agder, Norway

58°01'04"N 007°16'14"E

Helberg, Morten

-

25.02 2014

IJmuiden, Sluizen, Noord-Holland, The Netherlands

52°28'13"N 004°36'04"E

Verbeek, José

236/640/196

22.03 2014

IJmuiden, The Netherlands, Noord-Holland, The Netherlands

52°27'28"N 004°35'39"E

Slaterus, Roy

261/641/196

06.04 2014

IJmuiden (Forteiland), Noord-Holland, The Netherlands

52°27'50"N 004°34'25"E

Cottaar, Fred

276/641/196

13.04 2014

IJmuiden vissershaven, Noord-Holland, The Netherlands

52°27'29"N 004°35'37"E

Zorgdrager, Jan

283/641/196

02.05 2014

IJmuiden, Forteiland, Noord-Holland, The Netherlands

52°27'35"N 004°34'13"E

Verbeek, José

302/641/196

09.05 2014

IJmuiden, haven, Noord-Holland, The Netherlands

52°27'46"N 004°35'06"E

Verbeek, José

309/641/196

22.05 2014

IJmuiden, Forteiland, Noord-Holland, The Netherlands

52°27'35"N 004°34'13"E

Verbeek, José

322/641/196

05.07 2014

IJmuiden, Haven, , Noord-Holland, The Netherlands

52°27'34"N 004°34'54"E

Verbeek, José

366/641/196

16.07 2014

IJmuiden, Haven., Noord-Holland, The Netherlands

52°27'34"N 004°34'54"E

Verbeek, José

377/641/196

25.07 2014

IJmuiden, Haringhaven, Noord-Holland, The Netherlands

52°27'37"N 004°34'52"E

Cottaar, Fred

386/641/196

30.07 2014

ijmuiden , Noord-Holland, The Netherlands

52°27'42"N 004°34'16"E

Muusse, Mars

391/641/196

20.12 2014

ijmuiden, Noord-Holland, The Netherlands

52°27'26"N 004°34'59"E

Altenburg, Ruud, Muusse, Mars

534/641/196

below: Great Black-backed Gull (Larus marinus) JT631 2nd cycle (2CY), December 20 2014, IJmuiden, the Netherlands.

Between these observations, a partial autumn moult in the coverts and upper tertials is obvious. Faint mirror on P10.

Compare last photo below with the pictures from July. In July the complete moult in wing-coverts was finished once the gap in central GC was closed. This last image from December clearly illustrate the extent of the partial autumn moult: upper TT, inner GC, complete row of LLC and several LC replaced again.

below: Great Black-backed Gull (Larus marinus) JT631 2cy, July 30 2014, IJmuiden, the Netherlands.

Bird in complete moult: P8/-. All coverts replaced for 2nd gen feathers. Active moult in tail: central rectrices replaced, several growing.