Schistocephalus parasite infection alters sticklebacks' movement ability and thereby shapes social interactions

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Parasitism is ubiquitous in the animal kingdom. Although many fundamental aspects of host-parasite relationships have been unravelled, few studies have systematically investigated how parasites affect organismal movement. Here we combine behavioural experiments of Schistocephalus solidus infected sticklebacks with individual-based simulations to understand how parasitism affects individual movement ability and thereby shapes social interaction patterns. High-resolution tracking revealed that infected fish swam, accelerated, and turned more slowly than did non-infected fish, and tended to be more predictable in their movements. Importantly, the strength of these effects increased with increasing parasite load (proportion of body weight), with more heavily infected fish showing larger changes and impairments in behaviour. When grouped, pairs of infected fish moved more slowly, were less cohesive, less aligned, and less temporally coordinated than non-infected pairs, and mixed pairs were primarily led by the non-infected fish. These social patterns also emerged in simulations of self-organised groups composed of individuals differing similarly in speed and turning tendency, suggesting infection-induced changes in mobility and manoeuvrability may drive collective outcomes. Together, our results demonstrate how infection with a complex life-cycle parasite affects the movement ability of individuals and how this in turn shapes social interaction patterns, providing important mechanistic insights into the effects of parasites on host movement dynamics.

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ISO 690JOLLES, Jolle, Geoffrey P. F. MAZUÉ, Jacob D. DAVIDSON, Jasminca BEHRMANN-GODEL, Iain D. COUZIN, 2020. Schistocephalus parasite infection alters sticklebacks' movement ability and thereby shapes social interactions. In: Scientific Reports. Springer Nature. 2020, 10(1), 12282. eISSN 2045-2322. Available under: doi: 10.1038/s41598-020-69057-0
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@article{Jolles2020-07-23Schis-50576,
  year={2020},
  doi={10.1038/s41598-020-69057-0},
  title={Schistocephalus parasite infection alters sticklebacks' movement ability and thereby shapes social interactions},
  number={1},
  volume={10},
  journal={Scientific Reports},
  author={Jolles, Jolle and Mazué, Geoffrey P. F. and Davidson, Jacob D. and Behrmann-Godel, Jasminca and Couzin, Iain D.},
  note={Article Number: 12282}
}
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