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Disturbance and disease: host–parasite interactions in freshwater streams remain stable following wildfire

  • Special Issue: Parasites in Aquatic Ecology
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Abstract

Increases in the intensity and frequency of wildfires highlight the need to understand how fire disturbance affects ecological interactions. Though the effects of wildfire on free-living aquatic communities are relatively well-studied, how host–parasite interactions respond to fire disturbance is largely unexplored. Using a Before-After-Control-Impact design, we surveyed 10 stream sites (5 burned and 5 unburned) in the Willamette River Basin, Oregon and quantified snail host infection status and trematode parasite community structure 1 year before and two years after historic wildfires. Despite the severity of the wildfires, snail host populations did not show significant shifts in density or size distributions. We detected nine taxa of trematode parasites and overall probability of infection remained consistent over the three-year study period. However, at the taxon-specific level, we found evidence that infection probability by one trematode decreased and another increased after fire. In a larger dataset focusing on the first year after fire (9 burned, 8 unburned sites), we found evidence for subtle differences in trematode community structure, including higher Shannon diversity and evenness at the burned sites. Taken together, host–parasite interactions were remarkably stable for most taxa; for trematodes that did show responses, changes in abundance or behavior of definitive hosts may underlie observed patterns. These results have implications for using parasites as bioindicators of environmental change and suggest that aquatic snail-trematode interactions may be relatively resistant to wildfire disturbance in some ecosystems.

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Data availability

Data are available on DataDryad.org (https://doi.org/10.5061/dryad.j6q573nkd). R scripts are available on request from E. Svatos (emma.svatos@colostate.edu).

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Acknowledgements

We thank Colorado State University’s Department of Fish, Wildlife, and Conservation Biology, and Graduate Degree Program in Ecology for providing funding and support for this research. We also thank the Oregon Department of Forestry and the Oregon Department of Fish and Wildfire for granting us permits to access our survey sites and collect invertebrate specimens (Permits #314.24384; #26611). We would like to thank F. Carvallo, J. Trujillo, and the Preston Lab for their assistance with manuscript preparation.

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This research was supported by Colorado State University.

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All authors contributed to conceiving and designing the study. ECS and LPF performed data collection. ECS primarily analyzed the data with contributions from LPF. All authors contributed to writing the manuscript with ECS as lead writer.

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Correspondence to Emma C. Svatos.

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Svatos, E.C., Falke, L.P. & Preston, D.L. Disturbance and disease: host–parasite interactions in freshwater streams remain stable following wildfire. Oecologia 204, 401–411 (2024). https://doi.org/10.1007/s00442-023-05422-w

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