Thayer's Gull (thayeri)
(last update: January 22, 2013)
Table 4. Composition by taxon, from wingtip melanism (see text), of autumn to early spring samples of adult Iceland gull specimens.
Belongs to the paper:
Hybridization and changes in the distribution of Iceland gulls
(Larus glaucoides/kumlieni/thayeri),
by D. N. Weir, A.C. Kitchener and R. Y. McGowan,
IN: J. Zool., Lond.(2000) 252, 517-530.
Composition by taxon, from wingtip melanism (see text), of autumn to early spring samples of adult Iceland gull specimens. The region covers Atlantic wintering range from Greenland to the British Isles and the samples are wholly or mainly pre- and post-1950.
| Region | glaucoides % | kumlieni % | n birds | Source |
Pre-1950 |
. | . | . | . |
| Greenland to 1898 (a) | 100 | 0 | 15 | Winge (1898) |
| Northeast Iceland 1907-13 | 90 | 9 | 11 | this study |
| British Isles 1869-1915 | 75 | 25 | 4 | this study |
post-1950 |
. | . | . | . |
| Greenland (b) | 67 | 33 | 45 | Fjeldså & Jensen (1985) |
| Sowth-west Iceland 1966 | 38 | 62 | 139 | Ingolfsson (1967) |
| South-north-east Iceland 1954-89 | 50 | 50 | 10 | Weir et al. (1995) |
| Faroe Isles 1983 | 20 | 80 | 25 | Fjeldså & Jensen (1985) |
| Shetland Isles 1993-94 | 56 | 42 | 7 | Weir et al. (1995) |
(a) summer and winter birds combined.
(b)
must include some older specimens.