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首页> 外文期刊>Journal of Parasitology >POPULATION AND INFECTION DYNAMICS OF DAUBAYLIA POTOMACA (NEMATODA: RHABDITIDA) IN HELISOMA ANCEPS
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POPULATION AND INFECTION DYNAMICS OF DAUBAYLIA POTOMACA (NEMATODA: RHABDITIDA) IN HELISOMA ANCEPS

机译：幽门螺杆菌感染中桃花心虫（线虫：线虫种群）的种群和感染动力学

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摘要

Dalubaylia potomaca is an unusual parasite for several reasons. Specifically, it has a direct life cycle in which it uses a planorbid snail, Helisoma anceps, as the definitive host. In addition, adult females have been shown to be both the infective stage and the only stage documented to be shed from a live, infected host. Finally, adults, juveniles, and eggs have been observed in all tissues and blood spaces of the host, suggesting the parasite consumes and actively migrates through host tissue. The present study examined the population and infection dynamics of D. potomaca in Mallard Lake, a 4.9-ha public access pond in the Piedmont region of North Carolina. In particular, the study examined the role of seasonality on the prevalence and mean intensity of infection of D. potomaca in the snail host. Data collected from August 2008 to October 2009 suggest that prevalence and mean intensity were inversely related in the spring and fall. Prevalence in fall 2008 was 10.3% but increased to 47.3% in spring 2009. Conversely, intensity was high in fall 2008 at 52.4 +/- 8.9 worms/infected host but dropped to 3.1 +/- 0.3 worms/infected host in spring 2009. During the same time, the parasites within the snails went from highly aggregated populations in the fall to a less aggregated distribution in the spring. It is hypothesized that D. potomaca induces mortality of the snail hosts during the winter, followed by a rapid recruitment event of the nematodes by the snail population after torpor.
机译：由于多种原因，达鲁巴亚波托马卡虫是一种不寻常的寄生虫。具体来说，它具有直接的生命周期，在该生命周期中，使用了平整蜗牛Helisoma anceps作为最终宿主。此外，已证明成年雌性动物既是感染阶段，又是唯一从活的感染宿主中脱落的阶段。最后，在宿主的所有组织和血液空间中都观察到了成年，幼鱼和卵，这表明寄生虫会在宿主组织中消耗并活跃地迁移。本研究调查了位于北卡罗来纳州皮埃蒙特地区占地4.9公顷的Mallard湖中的D. potomaca种群和感染动态。尤其是，该研究检验了季节性对蜗牛寄主中波氏杆菌的感染率和平均感染强度的作用。从2008年8月至2009年10月收集的数据表明，春季和秋季的患病率和平均强度呈负相关。 2008年秋季的患病率是10.3％，但在2009年春季增加到47.3％。相反，强度在2008年秋季高，为52.4 +/- 8.9蠕虫/感染宿主，但在2009年春季下降到3.1 +/- 0.3蠕虫/感染宿主。在同一时间，蜗牛内的寄生虫从秋季的高度聚集种群发展到春季的较小聚集种群。据推测，波托马卡森氏菌在冬季诱导蜗牛寄主的死亡，然后是在受虫烧后蜗牛种群迅速吸收线虫。

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