second
calendar year: September
Last update of
this page: 27-09-05 20:53
By
September all 2cy LBBG are moulting primaries, secondaries and many also moult
coverts.
Moult
in the remiges:
Only
a small minority of 2cy LBBG still have old juvenile primaries left
in the wing (and this is the last p10, see e.g. picture
2), but many have shed all the juvenile primaries and grow new second
generation primaries. Compared to (fresh) juvenile primaries, the top of
second generation primaries is rounded. The average moult stage by early
September is just above 40, with p7 full-grown, while p8 and p9 are
growing. At the end of the month the primary score is over 45, with p7 or
p8
full-grown and p9 and p10 growing.
On
average, the outer secondaries (from S1 inwards) are full-grown by
September, but in the inner secondaries have been shed. By mid-September, birds can be found with old and new
secondaries and gaps of shed feathers. By the end of the month, in most
individuals the secondaries have been renewed completely and can be recognized
as such by
the fresh white tip.
Moult
in the rectrices:
On average
the tail has completely been renewed into second generation. Typically, the
contrast is obvious: the base commonly shoes vermiculation on the edge of a broad black tail-band
and a small white fringe at the tips.
In some individuals, the tail-feathers are abraded already with the tips
worn away. Probably, these are the birds that had replaced the complete
tail earlier in the season (in spring). The upper-tail coverts normally show
broad brown bars.
Tertials:
The
tertials are missing or have been replaced by second generation feathers. The upper
two tertials normally are the last to be moulted. The new tertials have an
extensive brown-black centre, a white bar at the tip and a sub-terminal
anchor pattern at the tip. Sometimes a (single central) tertial may appear
grey-centred with an arrow-head; a faint brown pattern along the fringe and a
faded white tip (see for instance image 7).
Probably, these feathers are already 3rd generation feathers
and have replaced tertials which were included in last autumn's moult.
Coverts:
In all the wing covert bars, active moult may be in progress. In
several individuals moult to second generation greater coverts and outer
lesser coverts have to be finished as late as the end of September.
Normally the median coverts are the first to be moulted, early in the
season. By September however, it's still possible to find 2cy LBBG which
have shed the median coverts, growing new feathers in. These birds are
moulting the median
coverts again into 3rd generation feathers. In pattern
they resemble the anchor or barred patterned 2nd generation
feathers (see image 7).
Other individuals show the pattern as seen in presumed intermedius
LBBGs: plain brown-grey coverts with a pronounced black wedge at the cente
(see e.g. image 5 and image
6).
Under-parts
and head:
These
feather groups have been renewed by neat feathers, with fine streaks on the ear
coverts and neat vermiculate bars on the flanks (see e.g. image
1).
Tables
Full-grown
primaries in 2cy LBBG Maasvlakte - the Netherlands,
August 22 2002
|
new
prims |
p5 |
p6 |
p7 |
p8 |
p9 |
p10 |
p8 old |
2 |
2 |
- |
- |
- |
- |
p9 old |
- |
5 |
1 |
- |
- |
- |
p10 old |
- |
- |
25 |
2 |
- |
- |
no old |
- |
- |
12 |
16 |
1 |
- |
Full-grown
primaries in 2cy LBBG Dannes
- NW France, September 21 2002
|
new
prims |
p5 |
p6 |
p7 |
p8 |
p9 |
p10 |
p10 old |
- |
- |
2 |
- |
- |
- |
no old |
- |
- |
- |
28 |
14 |
2 |
Full-grown
primaries in 2cy LBBG Maasvlakte - the Netherlands, September 28
2001
|
new
prims |
p5 |
p6 |
p7 |
p8 |
p9 |
p10 |
no old |
|
- |
9 |
26 |
61 |
9 |
|
2cy LBBG: graellsii
|
LBBG
graellsii PZP
Le Portel, NW France, September 21 2002. The primary moult score: P9
fully grown. 2cy bird from Britain. |
2cy LBBG: Dutch intergrade
|
LBBG
Dutch intergrade LL
September 29 2004, Westkapelle, the Netherlands. The primary moult score: P9
fully grown. Picture Pim Wolf. |
LBBG
Dutch intergrade L-51910
Le Portel, NW France, September 22 2002. The primary moult score: P9
fully grown. 2cy bird from Belgium. |
LBBG
Dutch intergrade IE
2cy September 18 2003, Naaktstrand, Maasvlakte, the Netherlands. |
LBBG
Dutch intergrade B14
Naaktstrand, Maasvlakte, September 01 2003. |
2cy
LBBG C95 E
September 25 2004, Amsterdam, the Netherlands. A bird ringed left red C95,
right yellow E. |
2cy LBBG: intermedius
|
LBBG
intermedius 4285081
Oostende, Belgium, September 04 2005. |
LBBG
intermedius JS94
Le Portel, NW France, September 21 2002. The primary moult score: P8
fully grown. |
LBBG
intermedius JV28
Le Portel, NW France, September 21 2002. The primary moult pace is
average for 2cy Lesser Black-backed Gulls with P9 fully grown. P10 is at
the length of P8. |
LBBG
intermedius JX86
Scheveningen, the Netherlands, September 16 2002. The
primary moult pace is low and slightly delayed with p7 new and p9 & p10 still juvenile. |
LBBG
intermedius 4139766
Westkapelle, the Netherlands, September 29 2004. Picture Pim Wolf. |
2cy LBBG: unringed birds in NW Europe
|
Photo
1: LBBG 2cy, Brouwersdam, the Netherlands, September 2 2001. Moult
score 43. |
Photo
2: LBBG 2cy, Bergen op Zoom, the Netherlands, September 17 2001. |
Photo
3: LBBG 2cy, Vuurtorenvlakte Maasvlakte, the Netherlands, September 17
2001. |
Photo
4: LBBG 2cy, Vuurtorenvlakte Maasvlakte, the Netherlands, September 17
2001. |
LBBG
2cy, Le Portel, NW France, September 22 2002. The primary moult
score: P9 fully grown. |
Photo
5: LBBG 2cy, Le Portel France, September 30 2001. |
Photo
6: LBBG 2cy, Le Portel France, September 30 2001. |
Photo
7: LBBG 2cy, Dannes - Le Portel France, September 30 2001. |
Photo
8: LBBG 2cy, Dannes - Le Portel France, September 30 2001. |
Photo
9: LBBG 2cy, Dannes - Le Portel France, September 30 2001. |