Great Black-backed Gull (Larus marinus)
(last update: July 12, 2015)
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.
