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<p><i>Pomphorhynchus laevis</i> is a freshwater heteroxenous parasite that infects <i>Gammarus pulex</i> as intermediate host and <i>Squalius cephalus</i> as definitive host. This acanthocephalan parasite is able to manipulate the behavior of <i>G. pulex</i> to increase probability of transmission between <i>G. pulex</i> prey and <i>S. cephalus</i> predator. Manipulation results from complex interactions and could be triggered or enhanced by biotic parameters. This experimental study investigated the effect of the presence both of <i>G. pulex</i> conspecifics and of <i>S. cephalus</i> cues on the behavior of <i>P. laevis</i>-infected and uninfected <i>G. pulex</i> in flowing water. The presence of <i>G. pulex</i> conspecifics increased the distance covered by both uninfected and <i>P. laevis</i>-infected gammarids in the artificial stream, whereas <i>S. cephalus</i> cues did not influence the distance covered by either. In static water, <i>S. cephalus</i> cues significantly decreased <i>G. pulex</i> attraction to light, regardless of infection status. Our results show that <i>P. laevis</i> manipulates distance covered regardless of the presence of either <i>G. pulex</i> conspecifics or <i>S. cephalus</i> cues. We discuss how these two biological parameters affect uninfected <i>G. pulex</i> and other factors involved in <i>P. laevis</i> manipulation of its gammarid host.</p>

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Pomphorhynchus laevis host manipulation regardless of presence of gammarid conspecifics or predator cues

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • H. Fanton,
  • E. Franquet,
  • N. Kaldonski

摘要

Pomphorhynchus laevis is a freshwater heteroxenous parasite that infects Gammarus pulex as intermediate host and Squalius cephalus as definitive host. This acanthocephalan parasite is able to manipulate the behavior of G. pulex to increase probability of transmission between G. pulex prey and S. cephalus predator. Manipulation results from complex interactions and could be triggered or enhanced by biotic parameters. This experimental study investigated the effect of the presence both of G. pulex conspecifics and of S. cephalus cues on the behavior of P. laevis-infected and uninfected G. pulex in flowing water. The presence of G. pulex conspecifics increased the distance covered by both uninfected and P. laevis-infected gammarids in the artificial stream, whereas S. cephalus cues did not influence the distance covered by either. In static water, S. cephalus cues significantly decreased G. pulex attraction to light, regardless of infection status. Our results show that P. laevis manipulates distance covered regardless of the presence of either G. pulex conspecifics or S. cephalus cues. We discuss how these two biological parameters affect uninfected G. pulex and other factors involved in P. laevis manipulation of its gammarid host.