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首页> 外文期刊>Comparative parasitology >Intrinsic Host Factors and the Distributional Limit of Paulisentis missouriensis (Acanthocephala) in Southeastern Nebraska, U.S.A.
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Intrinsic Host Factors and the Distributional Limit of Paulisentis missouriensis (Acanthocephala) in Southeastern Nebraska, U.S.A.

机译：美国内布拉斯加州东南部的Paulisentis missouriensis（Acanthocephala）的内在寄主因素和分布极限。

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摘要

Paulisentis missouriensis is a common acan-thocephalan parasite of creek chub (Semotilus atromacula-tus) in the streams of 2 drainages (South Fork and Turkey Creek) in the Big Nemaha River system in southeastern Nebraska, U.S.A., but is absent from streams in the remaining 2 drainages (Muddy Creek and North Fork). The present investigation tested whether intrinsic host-related factors are responsible for the distributional limit of P. missouriensis in this system. Copepods and creek chub were collected from streams where the worm is absent and exposed to infective stages of P. missouriensis under laboratory conditions. In addition, creek chub from areas lacking the worm were maintained in cages in a stream where the worm is abundant. Both creek chub and copepods from streams lacking the worm became infected under laboratory and field conditions. These results reject the possibility that the cause of the abrupt distributional limit of P. missouriensis in the Big Nemaha River system is due to intrinsic host-related phenomena. Other hypotheses that could account for the distributional limit include differing transmission conditions among drainages, environmental limits on completing development, and long-term spatio-temporal factors.
机译：Paulisentis missouriensis是美国内布拉斯加州东南部的大Nemaha河系统的两条排水（南叉和土耳其河）的溪流中常见的小河a（Semotilus atromacula-tus）的棘头虫病，但该病不在溪流中。其余2条排水渠（Muddy Creek和North Fork）。本研究测试了宿主内在相关因素是否对该系统中密苏里州假单胞菌的分布限度负责。 laboratory足类和小河是从没有蠕虫的溪流中收集的，并在实验室条件下暴露于密苏里州假单胞菌的感染阶段。另外，来自没有蠕虫的区域的小河被保持在蠕虫丰富的溪流中的笼子中。在实验室和野外条件下，缺乏蠕虫的溪流和co足类动物都被感染了。这些结果排除了大纳马哈河系统中密苏里州假单胞菌突然分布极限的原因是由于与宿主有关的内在现象的可能性。可以解释分布极限的其他假设包括排水沟之间的传播条件不同，完成开发的环境极限以及长期的时空因素。

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