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Parasite infection induces size-dependent host dispersal: consequences for parasite persistence

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Title: Parasite infection induces size-dependent host dispersal: consequences for parasite persistence
Authors: Terui, Akira Browse this author
Ooue, Keita Browse this author
Urabe, Hirokazu Browse this author
Nakamura, Futoshi Browse this author →KAKEN DB
Keywords: dispersal
Bayesian statistics
freshwater mussel
Issue Date: 15-Nov-2017
Publisher: Royal Society
Journal Title: Proceedings of the royal society b-biological sciences
Volume: 284
Issue: 1866
Start Page: 20171491
Publisher DOI: 10.1098/rspb.2017.1491
PMID: 29093220
Abstract: Host dispersal is now recognized as a key predictor of the landscape-level persistence and expansion of parasites. However, current theories treat post-infection dispersal propensities as a fixed trait, and the plastic nature of host's responses to parasite infection has long been underappreciated. Here, we present a mark-recapture experiment in a single host-parasite system (larval parasites of the freshwater mussel Margaritifera laevis and its salmonid fish host Oncorhynchus masou masou) and provide, to our knowledge, the first empirical evidence that parasite infection induces size-dependent host dispersal in the field. In response to parasite infection, large fish become more dispersive, whereas small fish tend to stay at the home patch. The observed plasticity in dispersal is interpretable from the viewpoint of host fitness: expected benefits (release from further infection) may exceed dispersal-associated costs for individuals with high dispersal ability (i.e. large fish) but are marginal for individuals with limited dispersal ability (i.e. small fish). Indeed, our growth analysis revealed that only small fish hosts incurred dispersal costs (reduced growth). Strikingly, our simulation study revealed that this plastic dispersal response of infected hosts substantially enhanced parasite persistence and occupancy in a spatially structured system. These results suggest that dispersal plasticity in host species is critical for understanding how parasites emerge, spatially spread, and persist in nature. Our findings provide a novel starting point for building a reliable, predictive model for parasite/disease management.
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中村 太士

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