Metazoan-protozoan parasite co-infections and host body weight in St Kilda Soay sheep
Metazoan-protozoan parasite co-infections and host body weight in St Kilda Soay sheep
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DOI：
10.1017/s0031182008004137
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发表时间：
2008-04-01
期刊：
影响因子：
2.4
通讯作者：
Pemberton, J. M.
中科院分区：
文献类型：
--
作者：
Craig, B. H.;Tempest, L. J.;Pemberton, J. M.
数百年来，尽管忍受着蠕虫、原生动物和节肢动物寄生虫的可能有害的共同感染以及间歇性的饥饿，但圣基尔达的未受管理的Soay绵羊种群仍然存活了下来。重要的寄生虫类群在年轻的Soay羊圆线虫（Trichostrongylus axei，Trichostrongylus vitrinus和Teladorsagia circumcincta），球虫（11个艾美耳球虫物种）和keds（绵羊Melophagus ovinus）和老年动物，Teladorsagia circumcincta。在这项研究中，不同的寄生虫类群的强度之间的关联进行了调查。其次，不同的寄生虫类群的强度进行了测试与主机重量的变化，这本身是一个决定因素的越冬生存的主机人口的关联。在羔羊中，圆线虫卵的强度与线虫的强度呈正相关。一岁鸽和成虫中圆线虫卵与球虫卵囊呈正相关。在羔羊和一岁，寄生虫类群测试，只有圆线虫卵显着负相关的主机重量。然而，在成年宿主中，圆线虫和球虫与宿主体重独立且负相关。这些结果与圆线虫和球虫对Soay羊进行独立选择的观点一致。
For hundreds of years, the unmanaged Soay sheep population on St Kilda has survived despite enduring presumably deleterious co-infections of helminth, protozoan and arthropod parasites and intermittent periods of starvation. Important parasite taxa in young Soay sheep are strongyles (Trichostrongylus axei, Trichostrongylus vitrinus and Teladorsagia circumcincta), coccidia (11 Eimeria species) and keds (Melophagus ovinus) and in older animals, Teladorsagia circumcincta. In this research, associations between the intensity of different parasite taxa were investigated. Secondly, the intensities of different parasite taxa were tested for associations with variation in host weight, which is itself a determinant of over-winter survival in the host population. In lambs, the intensity of strongyle eggs was positively correlated with that of Nematodirus spp. eggs, while in yearlings and adults strongyle eggs and coccidia oocysts were positively correlated. In lambs and yearlings, of the parasite taxa tested, only strongyle eggs were significantly and negatively associated with host weight. However, in adult hosts, strongyles and coccidia were independently and negatively associated with host weight. These results are consistent with the idea that strongyles and coccidia are exerting independent selection on Soay sheep.