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Haematological and blood biochemical changes in the sheep, as well as fecundity of gastrointestinal nematodes, suggested the hosts were immunosuppressed. In parallel, laboratory experiments in which Soay sheep on a high plane of nutrition were artificially infected with<jats:italic>Ostertagia circumcincta<\/jats:italic>, showed no clinical signs or mortality when supporting worm burdens similar to those recorded in dead sheep on St Kilda. Anthelmintic treatment of a group of animals increased daily survival rates in ewes and male lambs, although treated animals became re-infected as the \u2018crash\u2019 progressed. It is suggested that parasites contribute to mortality in malnourished hosts, exacerbating the effects of food shortage.<\/jats:p>","DOI":"10.1017\/s0031182000074679","type":"journal-article","created":{"date-parts":[[2009,6,5]],"date-time":"2009-06-05T14:17:43Z","timestamp":1244211463000},"page":"493-503","source":"Crossref","is-referenced-by-count":268,"title":["The role of nematode parasites in Soay sheep (<i>Ovis aries<\/i>L.) mortality during a population crash"],"prefix":"10.1017","volume":"105","author":[{"given":"F. M. 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