Variation in parasite resistance of Arctic charr, Salvelinus alpinus, between and within sympatric morphs
Karvonen, A., Beck, S. V., Skúlason, S., Kristjánsson, B. K., & Leblanc, C. A. (2021). Variation in parasite resistance of Arctic charr, Salvelinus alpinus, between and within sympatric morphs. Ecology and Evolution, 11(20), 14024-14032. https://doi.org/10.1002/ece3.8109
Published inEcology and Evolution
© 2021 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
Genetic variation in resistance against parasite infections is a predominant feature in host–parasite systems. However, mechanisms maintaining genetic polymorphism in resistance in natural host populations are generally poorly known. We explored whether differences in natural infection pressure between resource-based morphs of Arctic charr (Salvelinus alpinus) have resulted in differentiation in resistance profiles. We experimentally exposed offspring of two morphs from Lake Þingvallavatn (Iceland), the pelagic planktivorous charr (“murta”) and the large benthivorous charr (“kuðungableikja”), to their common parasite, eye fluke Diplostomum baeri, infecting the eye humor. We found that there were no differences in resistance between the morphs, but clear differences among families within each morph. Moreover, we found suggestive evidence of resistance of offspring within families being positively correlated with the parasite load of the father, but not with that of the mother. Our results suggest that the inherited basis of parasite resistance in this system is likely to be related to variation among host individuals within each morph rather than ecological factors driving divergent resistance profiles at morph level. Overall, this may have implications for evolution of resistance through processes such as sexual selection. ...
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Related funder(s)Centre for Economic Development, Transport and the Environment of Lapland; Academy of Finland
Funding program(s)Others; Academy Project, AoF; Research costs of Academy Research Fellow, AoF
Additional information about fundingEuropean Maritime and Fisheries Fund, Grant/Award Number: 43521; Academy of Finland, Grant/Award Number: 292736 and 310632
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