Lesser Black-backed Gull- Kleine Mantelmeeuw (graellsii & intermedius)

(last update: 16-2-2011)

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LBBG rings

lbbg 1cy May
lbbg 1cy June
lbbg 1cy July
lbbg 1cy August
lbbg 1cy September
lbbg 1cy October
lbbg 1cy Nov - Dec

lbbg 2cy Jan-Febr
lbbg 2cy Mar-April
lbbg 2cy May
lbbg 2cy June
lbbg 2cy July
lbbg 2cy August
lbbg 2cy September
lbbg 2cy October
lbbg 2cy Nov - Dec

lbbg 3cy Jan-April
lbbg 3cy May
lbbg 3cy June
lbbg 3cy July
lbbg 3cy August
lbbg 3cy September
lbbg 3cy October
lbbg 3cy Nov - Dec

lbbg sub-ad Jan-April
lbbg sub-ad May
lbbg sub-ad June
lbbg sub-ad July
lbbg sub-ad Aug
lbbg sub-ad Sept
lbbg sub-ad Oct
lbbg sub-ad Nov - Dec

lbbg ad January
lbbg adult February
lbbg adult Mar-April
lbbg adult May
lbbg adult June
lbbg adult July
lbbg ad August
lbbg ad September
lbbg ad October
lbbg ad Nov - Dec

first calendar year: September

Year 2000 we did a small survey on juvenile LBBG and moult (n=45). This year the survey was repeated and was done inside the colony in August. For the results, see the Juvenile LBBG August Section. 

By September, the large majority of juvenile LBBG have left the Netherlands and must have moved south towards Portugal. Many of the Dutch juveniles, which were seen moulting the scapulars in the colony (in August) must have joined these migrating groups. Nevertheless, many juveniles can still be found in the Netherlands, but as September progresses, more juveniles from Scandinavian colonies move in. This may be a reason for the "observed stand-still" in moult progress in juveniles: those local juveniles with advanced moult move south and less advanced individuals from Scandinavia fill the open positions or gather in mixed local groups.

Best option to reduce this problem is simultaneous counts throughout the West European coastline, or counts which only involve ringed individuals (thus from certain origin).
The problem of later hatched intermedius, moving into early moulting graellsii-groups is not a problem restricted to juveniles. To get a clear picture about arrested primary moult in autumn in adult graellsii plumage, the best place to look for these adults is probably outside the Netherlands, at the first major stop-over sites in Portugal for instance. It is believed that particularly those adults, which arrest primary moult, may also be keen on migrating south as quick as possible.

Moult score in body feathers of juvenile LBBG 16.09.2000, Maasvlakte, the Netherlands. 
mantle =mantle + scapulars; 
lesser =lesser coverts, 
median = median coverts, 
greater = greater coverts, 
# = number of  individuals. 
Normal pattern: moult in lower neck, followed by mantle, scapulars, coverts. First moulted coverts are the medians.
mantle lesser median greater #
0% 0 0 0 23
10% 0 0 0 3
30% 0 0 0 2
40% 0 0 0 2
50% 0 0 0 1
50% 0 1 0 1
50% 0 3 3 1
60% 0 2 2 1
70% 0 0 0 2
70% 0 2 0 1
75% 0 1 0 2
80% 0 2 1 1
80% 0 2 6 1
90% 0 3 3 1
100% 0 1 0 1
100% 1 6 1 1
100% 3 4 1 1
n = 45 exx.

U.K.: graellsii
2cy Dutch LBBG in February. (79773 bytes)LBBG 1cy WB4U September 14 2006 Ría de Aviles, Spain. Picture: Delfín González.
juvenile LBBG in September, ringed in the UK.LBBG 1cy 6ZF September 20 2004, La Séguinière, W France. A bird ringed in the UK last summer. Images Alain Fosse.
juvenile LBBG, ringed in the Netherlands. LBBG 1cy RR1S September 30 2012, Madrid, Spain. Photo by Delfín González.

France: graellsii
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull 1cy 452N September 30 2007, Westkapelle The Netherlands. Picture: Ies Meulmeester. Also as 5cy.
Lesser Black-backed Gull 1cy 770N September 02 2008, Boulogne sur mer, NW France. Picture: Jean-Michel Sauvage.

Belgium: 'Dutch intergrade'
juvenile LBBG in September, ringed in Belgium. LBBG 1cy AMAV September 23 1999, Westkapelle, the Netherlands. A bird ringed in Belgium last summer. Photo by Pim Wolf.
juvenile LBBG in September, ringed in Belgium. LBBG 1cy ATAM September 23 1999, Westkapelle, the Netherlands. A bird ringed in Belgium last summer. Photo by Pim Wolf.
juvenile LBBG in September, ringed in Belgium. LBBG 1cy BAAK September 16 1999, Westkapelle, the Netherlands. A bird ringed in Belgium last summer. Photo by Pim Wolf.
juvenile LBBG in September, ringed in Belgium. LBBG 1cy BCAG September 23 1999, Westkapelle, the Netherlands. A bird ringed in Belgium last summer. Photo by Pim Wolf.
juvenile LBBG in September, ringed in Belgium. LBBG 1cy BFAS September 30 2000, Westkapelle, the Netherlands. A bird ringed in Belgium last summer. Photo by Pim Wolf.
juvenile LBBG in September, ringed in Belgium. LBBG 1cy TWAL September 21 2011, Westkapelle, the Netherlands. Picture Maarten van Kleinwee.
juvenile LBBG in September, ringed in Belgium. (81371 bytes)LBBG 1cy BLB L-102454 September 02 2003, Westkapelle, the Netherlands. 
juvenile LBBG in September, ringed in Belgium. (77792 bytes)LBBG 1cy BLB L-106159 September 02 2003, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Belgium. (81095 bytes)LBBG 1cy BLB L-106998 September 02 2003, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Belgium. (88248 bytes)LBBG 1cy BLB L-107902 September 02 2003, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Belgium. (74292 bytes)LBBG 1cy BLB L-901162 September 27 2004, Westkapelle, the Netherlands. Picture Pim Wolf.
juvenile LBBG in September, ringed in Belgium. (72883 bytes)LBBG 1cy BLB L-901365 September 17 2004, Westkapelle, the Netherlands. Picture Pim Wolf.
juvenile LBBG in September, ringed in Belgium. (78358 bytes)LBBG 1cy BLB L-901703 September 27 2004, Westkapelle, the Netherlands. Picture Pim Wolf.
juvenile LBBG in September, ringed in Belgium. (88248 bytes)LBBG 1cy BLB L-910625 September 03 2009, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Belgium. (88248 bytes)LBBG 1cy BLB L-910938 September 03 2009, Westkapelle, the Netherlands.

the Netherlands: 'Dutch intergrade'

1cy argenteus in August, ringed in Belgium. (90559 bytes)LBBG Y.AMM 1cy, September 23 2010, Westkapelle, the Netherlands.
adult intermedius lbbg in October, ringed in Norway. (94818 bytes)LBBG Y.ALX 1cy, September 05 2009, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)LBBG K.BAT 1cy, September 04 2007, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)LBBG K.BAX 1cy, September 19 2007, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)LBBG K.AFR 1cy, September 08 2010, Barneveld, the Netherlands.
juvenile LBBG, ringed in the Netherlands. LBBG 1cy SL2 September 09 1998, Westkapelle, the Netherlands. Ringed in the Netherlands at Maasvlakte this year. Photo by Pim Wolf.
juvenile LBBG, ringed in the Netherlands. (68326 bytes)LBBG 1cy A14E September 24 2002, Scheveningen, the Netherlands.
juvenile LBBG, ringed in the Netherlands. LBBG 1cy C95E September 27 2003, Amsterdam, the Netherlands.
juvenile LBBG, ringed in the Netherlands. LBBG 1cy 13 September 21 2008, Madrid, Spain. Photo by Delfín González. Seen many times.
juvenile LBBG, ringed in the Netherlands. LBBG 1cy A7 September 30 2012, Madrid, Spain. Photo by Delfín González.
juvenile LBBG, ringed in the Netherlands. LBBG 1cy DE September 30 2012, Madrid, Spain. Photo by Delfín González.
juvenile LBBG, ringed in the Netherlands. LBBG 1cy 01 September 06 2010, Madrid, Spain. Photo by Delfín González.
juvenile LBBG, ringed in the Netherlands. LBBG 1cy WY September 01 2006, Erpion, Belgium. Picture Marc Fasol.
LBBG 1cy 5T September 12 2011, Boulogne sur mer, NW France. Picture: Jean-Michel Sauvage.
juvenile LBBG in October, ringed in the Netherlands. (111218 bytes)LBBG 1cy NLA 5.424.626 September 26 2008, Noordwijk, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)LBBG 1cy NLA 5.429.306 September 26 2008, IJmuiden, the Netherlands.
juvenile LBBG in October, ringed in the Netherlands. (111218 bytes)LBBG 1cy NLA 5.462.831 September 18 2010, Leiden, the Netherlands.
juvenile LBBG in October, ringed in the Netherlands. (111218 bytes)LBBG 1cy NLA 5.364.559 September 11 2004, Amsterdam, the Netherlands. Picture Ruud Altenburg.
juvenile LBBG in September, ringed in the Netherlands. (59255 bytes)LBBG 1cy  NLA 5.366.174 September 02 2001, Brouwersdam, the Netherlands.
juvenile LBBG in October, ringed in the Netherlands. (111218 bytes)LBBG 1cy NLA 5.412.231 September 11 2004, Amsterdam, the Netherlands. Picture Ruud Altenburg.
juvenile LBBG in October, ringed in the Netherlands. (111218 bytes)LBBG 1cy NLA 5.412.281 September 11 2004, Amsterdam, the Netherlands. Picture Ruud Altenburg.
juvenile LBBG in October, ringed in the Netherlands. (111218 bytes)LBBG 1cy NLA 5.412.347 September 11 2004, Amsterdam, the Netherlands. Picture Ruud Altenburg.
juvenile LBBG in October, ringed in the Netherlands. (111218 bytes)LBBG 1cy NLA 5.412.835 September 03 2005, Amsterdam, the Netherlands. Picture Ruud Altenburg.
juvenile LBBG in September, ringed in the Netherlands. (96331 bytes)LBBG 1cy NLA 5.xxx.166 September 17 2004, Westkapelle, the Netherlands. Picture Pim Wolf.
Germany: transition graellsii - intermedius

2cy intermedius in October, ringed in Norway. (97235 bytes)LBBG 1cy H.C11 September 09 2010, Westkapelle, the Netherlands.
2cy intermedius in October, ringed in Norway. (97235 bytes)LBBG 1cy H.C82 September 09 2010, Westkapelle, the Netherlands.
2cy intermedius in October, ringed in Norway. (97235 bytes)LBBG 1cy HN39 September 09 2010, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Germany. (98403 bytes)LBBG 1cy DEH 4304557 September 23 2010, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Germany. (98403 bytes)LBBG 1cy DEH 4285037 September 28 2004, Westkapelle, the Netherlands. Picture Pim Wolf.

Norway & Denmark: intermedius
juvenile LBBG, ringed in Norway. (71149 bytes)LBBG intermedius 1cy NOS 4238324 September 22 2002, Boulogne-sur-Mer, NW France.
Lesser Black-backed Gull 1cy J40E September 20 2007, Boulogne-sur-mer, NW France. Picture: Jean-Michel Sauvage.
juvenile LBBG in October, ringed in Norway. (131273 bytes)LBBG intermedius 1cy J4MN September 23 2010, Westkapelle, the Netherlands.
juvenile LBBG in October, ringed in Norway. (131273 bytes)LBBG intermedius 1cy J8A0 September 29 2007, Westkapelle, the Netherlands. Picture: Ies Meulmeester.
juvenile LBBG in September, ringed in Norway. (73485 bytes)LBBG intermedius 1cy J8HZ September 09 2010, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Denmark. (103609 bytes)LBBG intermedius 1cy JJ2T September 20 2011, Westkapelle, the Netherlands. Picture Maarten van Kleinwee.
juvenile LBBG in September, ringed in Norway. (73485 bytes)LBBG intermedius 1cy JXJ2 September 10 2009, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Norway. (73485 bytes)LBBG intermedius 1cy JZL0 September 10 2009, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Norway. (73485 bytes)LBBG intermedius 1cy J07J September 22 2002, Boulogne/Mer, NW France. A bird ringed in Norway last summer.
juvenile LBBG in September, ringed in Norway. (110895 bytes)LBBG intermedius 1cy JNJU September 17 2004, Westkapelle, the Netherlands. Picture Pim Wolf.
juvenile LBBG in September, ringed in Denmark. (103609 bytes)LBBG intermedius 1cy DKC ?9499 September 2004, Westkapelle, the Netherlands. Picture Pim Wolf.
juvenile LBBG in September, ringed in Denmark. (103609 bytes)LBBG intermedius 1cy DKC 5034754 September 20 2011, Westkapelle, the Netherlands. Picture Maarten van Kleinwee.
juvenile LBBG in September, ringed in Norway. (110895 bytes)LBBG intermedius 1cy V824 September 10 2009, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Norway. (110895 bytes)LBBG intermedius 1cy V907September 24 2009, Westkapelle, the Netherlands.
juvenile LBBG in September, ringed in Norway. (110895 bytes)LBBG intermedius 1cy VK9S September 20 2011, Westkapelle, the Netherlands. Picture Maarten van Kleinwee.