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The Soay sheep is a breed of domestic sheep (''Ovis aries'') descended from a population of feral sheep on the island of Soay in the St. Kilda Archipelago, about from the Western Isles of Scotland. It is one of the Northern European short-tailed sheep breeds. It remains physically similar to the wild ancestors of domestic sheep, the Mediterranean mouflon and the horned urial sheep of Central Asia.〔(Ryder, M L, (1981), "A survey of European primitive breeds of sheep", ''Ann. Génét. Sél. Anim.'', 13 (4), pp 381–418. )〕 It is much smaller than modern domesticated sheep but hardier, and is extraordinarily agile, tending to take refuge amongst the cliffs when frightened. Soays may be solid black or brown, or more often blonde or dark brown with buffish-white underbelly and rump (known as ''lachdann'' in Scottish Gaelic, which is cognate to the Manx ''loaghtan''); a few have white markings on the face.〔St Kilda Summer, by Kenneth Williamson and J Morton Boyd,Hutchinson and co. Ltd 1960〕 In the early twentieth century, some Soay sheep were relocated to establish exotic flocks, such as the flock of "Park Soay" at Woburn Abbey, established by the Duke of Bedford in 1910, and selected for "primitive" characteristics.〔 〕 A number of Soay sheep were translocated from Soay to another of the St Kilda group, the island of Hirta by the Marquess of Bute in the 1930s, after the human population and their sheep were evacuated. The name of the island is from Old Norse ''Seyðoy'', meaning "Island of Sheep". The breed was introduced to and live wild on Holy Isle off Arran.〔(【引用サイトリンク】title=Wildlife on the Island )〕 Soay sheep were introduced from St. Kilda to Lundy, an island in the Bristol Channel, by Martin Coles Harman soon after he purchased the island in 1924. There is also a small population living wild in and around the Cheddar Gorge in Somerset. The Soays are particularly hardy and have been allowed to become largely feral. They are particularly useful for Soay's ecosystem because they are very agile and sure-footed and so graze places that domesticated sheep can't. The breed is listed in "Category 4: At Risk" by the Rare Breeds Survival Trust, because there are only between 900 and 1500 registered breeding Soay ewes.〔 〕 The Soay is distinct from two other short-tailed breeds also associated with St. Kilda: the Boreray (from Boreray, another of the islands, and formerly also living on Hirta), and the "St. Kilda", a former name for the Hebridean sheep (which is probably not in fact from St. Kilda at all).〔 〕 ==Scientific study== The Hirta population is unmanaged and has been the subject of scientific study since the 1950s. The population makes an ideal model subject for scientists researching evolution, population dynamics and demography because the population is unmanaged, is closed (no emigration or immigration) and has no significant competitors or predators. The sheep exhibit a phenomenon known as overcompensatory density dependence, in which their population never reaches equilibrium. The population growth is so great as to exceed the carrying capacity of the island, which eventually causes a dramatic population crash, and then the cycle repeats. For example, in 1989, the population fell by two thirds within 12 weeks.〔 The age and sex structure of the population are important in determining when a crash happens; for instance, adult males enter winter in a poor condition after the autumn rut, whereas females have been grazing all summer and so enter winter in a good condition. Survival rates of males (and lambs) are influenced by weather throughout winter (dependent on the strength of the North Atlantic Oscillation), whereas survival rates of females (and adolescents) are influenced most strongly by rainfall at the end of winter, when they will normally be heavily pregnant (the rain soaks the wool, increasing energy expenditure).〔 Another factor in mortality rates is the loading of intestinal nematode parasites, particularly damaging in malnourished hosts. The breed was used in experimental archaeology at Butser Ancient Farm because it closely resembles British prehistoric breeds. The breed is becoming smaller because of the change in climate. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Soay sheep」の詳細全文を読む スポンサード リンク
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