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Herring Gull plumages:
hg 1cy July
hg 1cy August
hg 1cy September
hg 1cy October
hg 1cy November
hg 1cy December
hg 2cy January
hg 2cy February
hg 2cy March
hg 2cy April
hg 2cy May
hg 2cy June
hg 2cy July
hg 2cy August
hg 2cy September
hg 2cy October
hg 2cy November
hg 2cy December
hg 3cy January
hg 3cy February
hg 3cy March
hg 3cy April
hg 3cy May
hg 3cy June
hg 3cy July
hg 3cy August
hg 3cy September
hg 3cy October
hg 3cy November
hg 3cy December
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Herring Gull - 2cy April
Introduction
This
website deals with the Herring Gulls of the taxa argentatus and
argenteus. Argenteus is an abundant breeding species on
Iceland, Britain, NW France, Belgium, the Netherlands and N Germany.
The taxon argentatus breeds in NE Europe, from Denmark, the
coast of the Baltic Sea, Scandinavia and coast of the White Sea. In
the centre of the breeding range (Denmark and the NW German coast),
birds show intermediate characteristics, indicating there is a cline
in argenteus-argentatus: argenteus in Western
Europe is pale-backed, slightly smaller and with relatively much
black in the wing-tip; argentatus in the NE Europe is larger,
slightly darker on upper-parts and show less black in the wing-tip.
Due to the large breeding range, there is much intra-specific
variation in argentatus, with most powerful birds in the
northern populations, showing the most darkest upper-parts, longest
wing and most white in the outer-wing. Some populations may hold
substantial number of yellow-legged argentatus. (referred to
as "Finnmark yellow-legged argentatus"). In adult
plumage, the black sub-terminal spot on P5 is often lacking or
strongly reduced to a diffuse streak, broken at the centre.
Sometimes P6 lacks black as well.
In the Baltic region, other yellow-legged argentatus
populations occur ("Baltic yellow-legged argentatus"),
with adults showing even brighter yellow legs in summer and the
upper-parts only slightly darker than West European argenteus,
still much paler than Yellow-legged Gull (michahellis).
Those paler mantled argentatus often show a limited black
sub-terminal spot on P5 in adult plumage.
On these pages, we largely follow P.J. Grant: "Gulls, a guide
to identification" and E.K Barth's publication as Contribution
No. 86, Zoological Museum, University of Oslo: "The circumpolar
systematics of Larus argentatus and Larus fuscus with
special reference to the Norwegian populations".
2cy Herring Gull April: tables and charts
| Table 2: 2cy Herring Gull primary scores March-April 2002 (n = 604). Remaining old primaries (e.g. 7 = P4-P10 old; P1-P3 active moult to 2nd generation). Surveys from Scheveningen harbour, except April 19 & 20, which are from Dannes and Le Portel, NW France respectively. |
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04.04 |
05.04 |
08.04 |
12.04 |
17.04 |
18.04 |
19.04 |
20.04 |
22.04 |
27.04 |
| 7 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
2 |
| 8 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
2 |
3 |
5 |
| 9 |
2 |
1 |
2 |
1 |
3 |
9 |
19 |
11 |
7 |
8 |
| 10 |
40 |
31 |
40 |
35 |
36 |
64 |
91 |
42 |
34 |
37 |
|
n =
|
42 |
32 |
42 |
36 |
39 |
73 |
110 |
55 |
44 |
52 |
| av old P's |
10,0 |
10,0 |
10,0 |
10,0 |
9,9 |
9,9 |
9,8 |
9,7 |
9,7 |
9,5 |
| 95% CID |
0,1 |
0,1 |
0,1 |
0,1 |
0,1 |
0,1 |
0,1 |
0,1 |
0,2 |
0,2 |
| SD (s) |
0,2 |
0,2 |
0,2 |
0,2 |
0,3 |
0,3 |
0,4 |
0,5 |
0,6 |
0,8 |
| % 's 7 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
4 |
| 8 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
4 |
7 |
10 |
| 9 |
5 |
3 |
5 |
3 |
8 |
12 |
17 |
20 |
16 |
15 |
| 10 |
95 |
97 |
95 |
97 |
92 |
88 |
83 |
76 |
77 |
71 |
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Notes: CID: (Confidence Interval of the Difference); SD: Standard Deviation.
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April-Chart 1 (below): 2cy HG primary scores in 2002, except May 11 & 26 from 2001 (n = 903). Data as in table 2. Chart 1 shows the early primary moult stage for 2cy Herring Gull; the complete spring - summer figure is plotted in chart 2.

April-Chart 2 (below): 2cy HG primary scores in 2002 and 2001 (n = 2.632). Cumulative data plot for primary moult in spring - summer. Plot: remaining old primaries (e.g. 10 = P1-P10 old; 5 = P6-P10 old). Most data from Scheveningen harbour, Netherlands, but also Dannes and Le Portel, NW France. NW France data responsible for some peak values, e.g. July 10 and in late July indicating advanced primary moult stage compared to birds from Scheveningen. One may discuss including such data in this plot.

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Herring Gull 5.335.119
2cy (argenteus), April 12 2001, IJmuiden, the
Netherlands (52.27N 04.33E). |
Herring
Gull 5.365.836
2cy (argenteus), April 19 2002, Boulogne/Mer, France (50.42N,1.34E). |
Herring
Gull 5.366.981
2cy (argenteus), April 25 2003,
Scheveningen, the Netherlands. |
Herring
Gull H-117237 2cy (argenteus), April 19 2002, Boulogne/Mer, France (50.42N,1.34E). |
Herring
Gull H-125136
2cy (argenteus), April 25 2003,
Scheveningen, the Netherlands. |
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Herring
Gull H-132146
2cy, April 06 2004, Westkapelle, the Netherlands (51.33N -
03.25E). Picture Pim Wolf. |
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Herring
Gull DA
216323 2cy (argenteus),
April 20 2002, Boulogne/Mer, France (50.42N,1.34E). |
Herring
Gull DA
212950 2cy (argenteus),
April 20 2002, Boulogne/Mer, NW France. |
Herring
Gull 1L5
2cy (argenteus),
April 30 2003, Boulogne/Mer, NW France. |
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Herring Gull 2cy (argentatus) C2Z0 April 2006, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen. |
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Herring Gull 2cy (argentatus) C7X8 April 2006, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen. |
Herring Gull 2cy (argentatus) C7Z4 April 2006, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen. |
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Herring Gull 2cy (argentatus) C9Y9 April 2006, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen. |
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Herring Gull 2cy (argentatus) HT-25x.xxx April 2006, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen. |
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Herring Gull 2cy (argentatus) HT-252.xxx April 20065, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen. |
Herring
Gull 2cy (argenteus), April 20 2002, Boulogne/Mer, France (50.42N,1.34E). |
Herring
Gull 2cy (argentatus), April 25 2003,
Scheveningen, the Netherlands. |
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Herring
Gull 2cy, April 25 2003, Scheveningen, the Netherlands. |
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