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首页> 外文期刊>Journal of Parasitology >Invisible Parasites and Their Implications for Coexisting Water Fleas
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Invisible Parasites and Their Implications for Coexisting Water Fleas

机译：隐形寄生虫及其对共存水蚤的影响

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The top-down effects of consumers, such as predators, are known to affect abundances, size structure, and species composition in aquatic ecosystems. Parasites are also important in shaping the ecology of free-living species; however, their effects are often overlooked because parasites can be difficult to detect. Parasites can be particularly challenging to observe in zooplankton hosts because of their small size and ephemeral infection periods. To overcome these challenges, we used a quarantine approach combined with high-magnification microscopy to increase detection of parasites of the tropical Cladoceran, Ceriodaphnia cornuta, in Lake Gatun, Panama. Using this approach, we were able to demonstrate that competing morphs of Ceriodaphnia experience differential rates of infection, where the subordinate competitor suffered higher parasite prevalence than did the dominant morph. Predation by fishes on the dominant morph is considered the principal mechanism for their coexistence, but we hypothesize that parasites may also play a role in maintaining morphotype diversity of Ceriodaphnia.
机译：众所周知，消费者（例如捕食者）的自上而下效果会影响水生生态系统中的丰度，尺寸结构和物种组成。寄生虫在塑造自由生活的生态学方面也很重要;然而，它们的效果通常被忽视，因为寄生虫可能难以检测。由于它们的小尺寸和短暂的感染时期，寄生虫在浮游动物宿主观察到尤其挑战。为了克服这些挑战，我们使用了检疫方法与高倍倍率显微镜相结合，增加了巴拿马湖的热带秘密山脉寄生虫的寄生虫。使用这种方法，我们能够证明Ceriodaphnia的竞争变形体现差异的感染率，下属竞争对手患有较高的寄生素流行率而不是主导的变形。鱼类对主导变形的捕食被认为是他们共存的主要机制，但我们假设寄生虫也可能在维持Ceriodaphnia的Morphotype多样性方面发挥作用。

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