Abstract
Despite their ubiquity and considerable biomass, the roles played by parasites in aquatic food webs are still not well understood, especially those of their free-living infectious stages. For instance, cercariae, the motile larvae of parasitic flukes (trematodes) may be a key source of nutrients and energy for consumers. As cercariae clonally reproduce within the digestive-gonadal gland complex of gastropod intermediate hosts that acquire nutritionally important polyunsaturated fatty acids (PUFA) mainly from their diets (e.g., by grazing on primary producers), cercariae could transfer snail-derived PUFA if consumed. Through fatty acid (FA) analysis, we explored whether a change in the diet of parasitized hosts altered the FA profiles of both snail-only and trematode-containing snail tissue, thereby affecting their nutritional values. Freshwater snails (Stagnicola elodes) infected with Plagiorchis sp. were fed three different diets (cyanobacteria, green algae, and diatoms) that differed in nutritional quality with respect to FA profiles. While diet influenced the overall FA composition of both snail-only tissue and snail tissue containing trematodes, levels of certain PUFA (mainly omega-3) were largely unaffected. Trematode-containing snail tissue also generally contained more PUFA relative to snail-only tissue. Notably, both tissue types had far higher levels of PUFA than found in their diets. Our results suggest that freshwater snail hosts, and possibly their associated trematode parasites, could be trophic upgraders of key PUFA despite anthropogenically induced changes in algal communities that may lead to overall diminished PUFA contents. As such, cercariae-mediated trophic transfers of PUFA may play important roles in aquatic food webs.
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Acknowledgements
We thank H. Roshon (CPCC), J. Rohonczy (ECCC), K. Puddephatt, R. Goldberg, T. Smith, A. Williams, and B. Schultz for experimental assistance, as well as L.C. Campbell for advice. This work was supported by Discovery Grants from the Natural Sciences and Engineering Research Council of Canada to MTA and JK (04537-2014 and 05566-2015, respectively). We would also thank the two anonymous reviewers who provided valuable feedback on this manuscript.
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DB, JK, and MA conceived and designed the experiments. DB performed the experiments. DB and CP analyzed the data, and all authors contributed to writing the manuscript. The authors declare that they have no conflict of interest.
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Communicated by Jason Todd Hoverman.
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Babaran, D., Koprivnikar, J., Parzanini, C. et al. Parasites and their freshwater snail hosts maintain their nutritional value for essential fatty acids despite altered algal diets. Oecologia 196, 553–564 (2021). https://doi.org/10.1007/s00442-021-04944-5
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DOI: https://doi.org/10.1007/s00442-021-04944-5