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首页> 外文期刊>Journal of Parasitology >Increased surfacing behavior in longnose killifish infected by brain-encysting trematode.
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Increased surfacing behavior in longnose killifish infected by brain-encysting trematode.

机译：在长有脑线虫感染的长鼻kill鱼中，表面行为增加。

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摘要

Some parasites modify the behavior of intermediate hosts to increase the probability of transmission to the next host in their life cycle. In habitats where this is common, parasites play an important role in predator-prey links and food web dynamics. In this study we used laboratory observations to investigate the behavior of longnose killifish, Fundulus similis, that were naturally infected with metacercariae of the trematode, Euhaplorchis sp. A, from Laguna Madre, south Texas. In particular, we examined whether there was a relationship between the number of metacercariae lodged on the brain of the infected fish and behaviors that made the fish more conspicuous to avian final hosts. We also quantified the abundance and cercariae production of this parasite in its first intermediate snail host, Cerithidea pliculosa, and examined the seasonal variation of Euhaplorchis sp. A in F. similis. Our data demonstrated that Euhaplorchis sp. A affected the surfacing behavior of F. similis in an intensity-dependent manner. Fish with many infections spent longer time at the surface of the water than fish with few infections. Our data also show that Euhaplorchis sp. A is a common parasite in the first intermediate host and produces close to 4,000 cercariae m-2 day-1. Consequently 97% of all fish collected and necropsied were infected, with little seasonal variation in the mean abundance of the parasite. Based on our data, Euhaplorchis sp. A is likely important to predator-prey links in Gulf of Mexico estuary food webs, similar to the closely related Euhaplorchis californiensis in southern California. We expect that other closely related species elsewhere may have similar effects on other fish hosts, emphasizing the need for incorporating trophically transmitted parasites in estuarine food web studies.
机译：一些寄生虫会改变中间宿主的行为，从而增加其生命周期中传播给下一个宿主的可能性。在常见的栖息地中，寄生虫在捕食者与猎物的联系和食物网动态中起着重要作用。在这项研究中，我们使用实验室观察来研究长鼻n鱼的行为，即Fund孔Fund鱼自然感染了吸虫的meta虫。 A，来自德克萨斯州南部的拉古纳·马德雷（Laguna Madre）。特别是，我们检查了被感染鱼的大脑中沉积的meta尾cer的数量与使鱼对禽类最终宿主更显眼的行为之间是否存在关联。我们还定量了其第一个中间蜗牛宿主Cerithidea pliculosa中该寄生虫的丰度和尾c的生产，并研究了Euhaplorchis sp。的季节性变化。 F. similis中的A。我们的数据表明，Euhaplorchis sp。 A会以强度依赖的方式影响F. similis的表面行为。感染多的鱼比感染少的鱼在水面停留的时间更长。我们的数据也显示Eu​​haplorchis sp.。 A是第一中间宿主中的常见寄生虫，并在 -2 天 -1 天产生近4,000尾cer。因此，所有收集和尸检的鱼中有97％被感染，寄生虫的平均丰度几乎没有季节性变化。根据我们的数据，Eupallorchis sp.。对墨西哥湾河口食物网中的捕食者-捕食者链接而言，A可能很重要，类似于在加利福尼亚南部密切相关的加利福尼亚大戟（Euhaplorchis californiensis）。我们希望其他地方的其他密切相关物种可能对其他鱼类寄主产生类似的影响，强调在河口食物网研究中需要纳入营养传递性寄生虫。

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