Herring Gull- Zilvermeeuw (argentatus & argenteus)

(last update: December 15, 2011 )

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 large, powerful birds in the northern populations, showing the most darkest upper-parts, longest wing and most white in the outer-wing. In this region, 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 Baltic argentatus often show a black sub-terminal spot on P5 in adult plumage.
On these web-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. 
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

Notes: CID:  (Confidence Interval of the Difference); SD: Standard Deviation.

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.

rings argenteus: U.K.


2cy argenteus in April, ringed on Guernsey. (61371 bytes)Herring Gull 1L5 2cy (argenteus), April 30 2003, Boulogne/Mer, NW France.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull GR 35613 2cy (argenteus), April-July 2012, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
rings argenteus: France
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull 761N, 2cy (argenteus), April 06 2009, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
2cy argenteus in April, ringed in France. (77289 bytes)Herring Gull DA 216323 2cy (argenteus), April 20 2002, Boulogne/Mer, France (50.42N,1.34E).
2cy argenteus in April, ringed in France. (74532 bytes)Herring Gull DA 212950 2cy (argenteus), April 20 2002, Boulogne/Mer, NW France.
rings argenteus: Belgium
1cy argenteus in November, ringed in Belgium. (25637 bytes)Herring Gull CGAR 2cy (argenteus), April 05 2009, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
2cy argenteus in April, ringed in Belgium. (100067 bytes)Herring Gull H-117237 2cy (argenteus), April 19 2002, Boulogne/Mer, France (50.42N,1.34E).
2cy argenteus in April, ringed in Belgium. (57306 bytes)Herring Gull H-125136 2cy (argenteus), April 25 2003, Scheveningen, the Netherlands.
2cy argenteus in April, ringed in Belgium. (101497 bytes)Herring Gull H-132146 2cy, April 06 2004, Westkapelle, the Netherlands (51.33N - 03.25E). Picture Pim Wolf.
rings argenteus: the Netherlands
2cy argenteus in April, ringed in Belgium. (101497 bytes)Herring Gull TV 2cy, April 23 2007, Westkapelle, the Netherlands (51.33N - 03.25E). Picture Pim Wolf.
2cy argenteus in April, ringed in the Netherlands.Herring Gull5.335.119 2cy (argenteus), April 12 2001, IJmuiden, the Netherlands (52.27N 04.33E).
2cy argenteus in April, ringed in the Netherlands. (81141 bytes)Herring Gull 5.365.836 2cy (argenteus), April 19 2002, Boulogne/Mer, France (50.42N,1.34E).
2cy argenteus in April, ringed in the Netherlands. (75958 bytes)Herring Gull 5.366.981 2cy (argenteus), April 25 2003, Scheveningen, the Netherlands.
rings argentatus: Denmark
2cy argenteus in April, ringed in Belgium. (101497 bytes)Herring Gull DKC 4139569 2cy, April 23 2007, Westkapelle, the Netherlands (51.33N - 03.25E). Picture Pim Wolf.
rings argentatus: Finland
Herring Gull 2cy (argentatus) C2Z0 April 2006, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen.
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.
Herring Gull 2cy (argentatus) C9Y9 April 2006, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen.
Herring Gull 2cy (argentatus) HT-25x.xxxApril 2006, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen.
Herring Gull 2cy (argentatus) HT-252.xxx April 20065, Tampere, Finland (61.31N,23.43E). Picture Hannu Koskinen.
rings argentatus: Russia
2cy argenteus in April, ringed in Belgium. (101497 bytes)Herring Gull KV79 2cy, April 23 2007, Westkapelle, the Netherlands (51.33N - 03.25E). Picture Pim Wolf.
unringed 2cy Herring Gulls
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 11 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes) Herring Gull 2CY, April 09 2014, Katwijk, the Netherlands.
2cy argenteus in April. (101894 bytes)Herring Gull 2cy (argenteus), April 20 2002, Boulogne/Mer, France (50.42N,1.34E).
2cy argentatus in April. (65344 bytes)Herring Gull 2cy (argentatus), April 25 2003, Scheveningen, the Netherlands.
2cy herring gull in April. (45161 bytes)Herring Gull 2cy, April 25 2003, Scheveningen, the Netherlands.