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首页> 外文期刊>Journal of Parasitology >The Influence of Habitat on the Distribution and Abundance of Metacercariae of Macravestibulum obtusicaudum (Pronocephalidae) in a Small Indiana Stream
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The Influence of Habitat on the Distribution and Abundance of Metacercariae of Macravestibulum obtusicaudum (Pronocephalidae) in a Small Indiana Stream

机译：生境对印第安那小溪中Macravestibulum obtusicaudum（Pronocephalidae）尾cer的分布和丰度的影响

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摘要

Snails (Elimia livescens) from a central Indiana stream were examined for encysted metacercariae of Macravestibulum obtusicaudum (Pronocephalide) to determine the distribution and abundance of this parasite on its second intermediate host. Five samples of snails were collected, with 2 samples being restricted to high-flow (riffle) or low-flow (pool) areas of the stream. Snails (n = 386) were measured for shell length; the shell and the inner and outer surfaces of the operculum (in most samples) were examined for metacercariae. Seventy-five percent of snails (overall) had encysted metacercariae (range, 52–97%), primarily on the opercula. A significantly lower proportion of snails from riffles were infected, and these snails had significantly fewer cysts as well. Snails collected from pools showed up to 10 times as many metacercariae than those from riffles, although there was no significant difference in the proportion of snails with intramolluscan infections of M. obtusicaudum. The inner opercular surface appeared to be the preferred site of encystment in both flow regimes. Differences in microhabitats, in terms of both snails in the stream and metacercariae on the snails, clearly must be considered when evaluating the infection patterns of this trematode.
机译：检查了来自印第安那州中部一条河流的蜗牛（Elimia livecens）的ob虫Macrovestibulum obtusicaudum（Pronocephalide）的转移cer虫，以确定该寄生虫在其第二中间宿主上的分布和丰度。收集了五个蜗牛样品，其中两个样品仅限于溪流的高流量（浅滩）或低流量（水池）区域。测量蜗牛（n = 386）的壳长；检查meta壳和and的内外表面（在大多数样品中）是否有cer虫病。百分之七十五的蜗牛（总体）感染了meta尾meta（占52％至97％），主要在骨上。来自浅滩的蜗牛被感染的比例要低得多，这些蜗牛的囊肿也要少得多。从池中收集的蜗牛的meta尾meta的数量最多是从浅滩的蜗牛的十倍，尽管在软体动物内感染ob鱼支原体的蜗牛的比例没有显着差异。在两种流动方式中，内手术表面似乎都是囊化的优选部位。在评估这种吸虫的感染方式时，必须明确考虑微生境的差异，就溪流中的蜗牛和蜗牛上的尾cer而言。

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  • 来源
    《Journal of Parasitology》 |2003年第5期|p.1088-1090|共3页
  • 作者

    Eric J. Wetzel and Eric W. Shreve;

  • 作者单位

    Department of Biology, Wabash College, 301 West Wabash Avenue, Crawfordsville, Indiana 47933. wetzele@wabash.edu;

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