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首页> 外文期刊>Comparative parasitology >Development of Anguillicoloides crassus in a Cyclopoid Copepod from the Acanthocyclops robustus-americanus-vernalis Complex in South Carolina, USA
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Development of Anguillicoloides crassus in a Cyclopoid Copepod from the Acanthocyclops robustus-americanus-vernalis Complex in South Carolina, USA

机译：来自美国南卡罗来纳州的Acanthocyclopsrobustus-americanus-vernalis复合体的类轮足Co足类中的Anguillicoloides crassus的发育。

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摘要

The invasive nematode Anguillicoloides crassus parasitizes the swim bladder of eels, including that of the American eel, Anguilla rostrata. Despite its potential devastating effects on eel populations, however, its intermediate host(s) is/are unknown in North America. The goal of this study was to determine whether An. crassus could infect copepods collected in the wild from the Goose Creek Reservoir in South Carolina, U.S.A., where An. crassus is known to occur. Cyclopoid copepods, identified morphologically as belonging to the Acantlzocyclops robustus-americanus-vernalis species complex, were successfully experimentally infected by second-stage larvae (L(2)s) of An. crassus from eels captured in South Carolina, U.S.A. One infected copepod was identified as Ac. americanus via sequencing of a 251-base pair (bp) portion of mitochondrial cytochrome oxidase I DNA. For each infection experiment, 30 to 60 copepods were exposed for 24 hr to Las at either 21 degrees C or 26 degrees C and maintained at their respective exposure temperatures to monitor larval development until larvae molted to the L-3 stage. More than 85% of the exposed copepods showed Las in their intestine or hemocoel at 24 hr postexposure. Larvae molted into the L-3 stage in 7 d at 26 degrees C and 12 d at 21 degrees C. Based on these results, species within the Acantlzocyclops vernalis-robustus-americanus complex are implied to be natural intermediate hosts of An. crassus in North America.
机译：侵入性线虫Anguillicoloides crassus寄生了鳗鱼的游泳膀胱，包括美洲鳗Anguilla rostrata。尽管其可能对鳗鱼种群造成毁灭性影响，但在北美尚不清楚其中间宿主。这项研究的目的是确定是否。 crassus可能感染从美国南卡罗来纳州的鹅溪水库从野外收集的co足类动物。已知发生crassus。在形态上被鉴定为强壮棘轮虫-美洲-vernalis物种复杂的类轮足co足类，被An的第二阶段幼虫（L（2）s）成功地实验感染。来自美国南卡罗来纳州捕获的鳗鱼的crassus。一种被感染的co足类动物被鉴定为Ac。通过对线粒体细胞色素氧化酶I DNA的251个碱基对（bp）部分进行测序来确定美洲。对于每个感染实验，将30至60只pe足类动物分别在21摄氏度或26摄氏度的Las中暴露24小时，并保持在各自的暴露温度下，以监测幼虫的发育，直到幼虫蜕变为L-3期。暴露后24小时，超过85％的暴露的pe足类动物在其肠道或血细胞中显示Las。幼虫在26摄氏度的7 d和21摄氏度的12 d蜕变为L-3阶段。基于这些结果，隐孢子虫-稳健-美洲复合体中的物种被认为是An的天然中间宿主。北美的crassus。

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