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首页> 外文期刊>Journal of Parasitology >Density-dependent topographical specialization in Gyrodactylus anisopharynx (Monogenoidea, Gyrodactylidae): boosting transmission or evading competition?
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Density-dependent topographical specialization in Gyrodactylus anisopharynx (Monogenoidea, Gyrodactylidae): boosting transmission or evading competition?

机译：食指假单胞菌（Monogenoidea，Gyrodactylidae）中依赖密度的地形专业化：促进传播还是逃避竞争？

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摘要

Viviparous gyrodactylids are remarkable monogenoid ectoparasites, not only because of their speciousness, but also due to their unusually wide range of hosts. Although many factors have been proposed to determine the location where gyrodactylids attach to their hosts, little is known about how their preference for specific host body regions changes over the course of infection. In this study, we investigate the dynamics of topographical specialization of the parasite Gyrodactylus anisopharynx on 2 of its natural freshwater fish hosts (Corydoras paleatus and C. ehrhardti), as well as a naive host (C. schwartzi). We recorded the spatial location of this parasite from the foundation of the infrapopulation to its extinction to assess how topographical specialization is affected by host species, the size and the age of the infrapopulation, and the possibility of transmission among hosts. Our results indicate that topographical specialization is negatively correlated with infrapopulation size and only marginally affected by infrapopulation age. Also, the degree of specialization was different among host species, but seemed unaffected by the possibility of transmission among hosts. Therefore, observed changes in spatial specialization of G. anisopharynx do not appear to represent adaptive responses to maximize their transmission. Rather, mechanisms such as increased competition and/ or local immune responses might cause parasites to occupy less favorable regions of the body of their hosts with increasing density.
机译：卵生的陀螺触角类动物是显着的单基因型外寄生虫，不仅因为它们的似是而非，而且还因为它们的宿主范围异常广泛。尽管已经提出了许多因素来确定陀螺内酯附着于其宿主的位置，但是鲜为人知关于它们对特定宿主体区域的偏好在感染过程中如何变化。在这项研究中，我们调查了2种天然淡水鱼寄主（Corydoras paleatus和C. ehrhardti）以及幼稚寄主（C. schwartzi）上寄生虫Gyrodactylus anisopharynx的地形专业化动力学。我们记录了该寄生虫从种群的基础到灭绝的空间位置，以评估寄主物种如何影响地形专业化，种群的大小和年龄以及宿主之间传播的可能性。我们的结果表明，地形专业化与人口规模负相关，仅受人口年龄的影响很小。同样，宿主种类之间的专业化程度也不同，但是似乎不受宿主之间传播的可能性的影响。因此，观察到的厌食口齿虫的空间专长变化似乎并不代表适应性反应，以使其传播最大化。相反，诸如增加竞争和/或局部免疫反应的机制可能导致寄生虫以增加的密度占据其宿主身体的较不利区域。

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