Negative associations between parasite avoidance, resistance and tolerance predict host health in salmonid fish populations
Klemme, I., Hyvärinen, P., & Karvonen, A. (2020). Negative associations between parasite avoidance, resistance and tolerance predict host health in salmonid fish populations. Proceedings of the Royal Society B : Biological Sciences, 287(1952), Article 20200388. https://doi.org/10.1098/rspb.2020.0388
DisciplineAkvaattiset tieteetAquatic Sciences
© 2020 The Authors
Genetic variation in defence against parasite infections is fundamental for host–parasite evolution. The overall level of defence of a host individual or population includes mechanisms that reduce parasite exposure (avoidance), establishment (resistance) or pathogenicity (tolerance). However, how these traits operate and evolve in concert is not well understood. Here, we investigated genetic variation in and associations between avoidance, resistance and tolerance in a natural host–parasite system. Replicated populations of Atlantic salmon (Salmo salar) and sea trout (an anadromous form of brown trout, Salmo trutta) were raised under common garden conditions and infected with the eye fluke Diplostomum pseudospathaceum. We demonstrate significant genetic variation in the defence traits across host populations and negative associations between the traits, with the most resistant populations showing the weakest avoidance and the lowest infection tolerance. These results are suggestive of trade-offs between different components of defence and possibly underlie the genetic variation in defence traits observed in the wild. Because the three defence mechanisms affect host–parasite evolution in profoundly different ways, we emphasize the importance of studying these traits in concert. ...
PublisherThe Royal Society Publishing
ISSN Search the Publication Forum0962-8452
Dataset(s) related to the publicationhttps://doi.org/10.5061/dryad.g4f4qrfmt
Publication in research information system
MetadataShow full item record
Related funder(s)Academy of Finland
Funding program(s)Research costs of Academy Research Fellow, AoF; Academy Project, AoF
Additional information about fundingThis work was funded by the Academy of Finland (grant nos. 263864, 292736 and 310632 to A.K.)
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