Coordinators:
Amar Ayyash (US)
Bruce Mactavish (Canada)
Dave Brown (Canada)
Mars Muusse (Netherlands)
smith rings
smith PDF's
smith 1cy August
smith 1cy September
smith 1cy October
smith 1cy November
smith 1cy December
smith 2cy January
smith 2cy February
smith 2cy March
smith 2cy April
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smith 2cy June
smith 2cy July
smith 2cy August
smith 2cy September
smith 2cy October
smith 2cy November
smith 2cy December
smith 3cy January
smith 3cy February
smith 3cy March
smith 3cy April
smith 3cy May
smith 3cy June
smith 3cy July
smith 3cy August
smith 3cy September
smith 3cy October
smith 3cy November
smith 3cy December
smith sub-ad January
smith sub-ad February
smith sub-ad March
smith sub-ad April
smith sub-ad May
smith sub-ad June
smith sub-ad July
smith sub-ad August
smith sub-ad September
smith sub-ad October
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smith ad January
smith ad February
smith ad March
smith ad April
smith ad May
smith ad June
smith ad July
smith ad August
smith ad September
smith ad October
smith ad November
smith ad December
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American Herring Gull (smithsonianus) adult.
P6 (figure 9)
The shape of the black mark is important. The black band was always complete in our sample of NF smithsonianus (in some birds of European forms, especially in argentatus, there is sometimes only an incomplete black band), and the pattern was usually sharply pointed. It is pointed along the inner edge, along the shaft, and along the outer edge, so that the pattern tends to resemble a sort of drawn out ’W’ (see figure 9a and percentages below it). In quite a few European birds, the black band is clearly broader, lacking the three pointed wedges, and showing an oblique, rounded or straight upper border on the outer web (figure 9b and 9c).
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% NF smithsonianus |
95.0 |
4.4 |
0.6 |
% argenteus |
62.5 |
8.6 |
29.1 |
% argentatus |
55.6 |
33.3 |
11.1 |
% E-Baltic Herring Gull |
51.3 |
35.1 |
13.5 |
FIGURE 9 Variation in pattern of P6 in herring gulls (Peter Adriaens). Percentages refer to the shape of the black pattern. Here, for instance, it is stated that 95% in our sample of NF smithsonianus showed a rather drawn-out
'W-pattern', being sharply pointed along the outer edge and the shaft, as illustrated in figure 9a. (click on image for larger view) |
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