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Colilargo’s occupancy and the role of native and exotic plants in hantavirus expansion and transmission risk

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Abstract

In this work, we examined the relationship of Oligoryzomys longicaudatus’ (the Andes virus [ANDV] host, commonly known as the colilargo) occupancy and the cover of dominant woody and herbaceous plant species recorded in censuses along traplines for mice. We found that O. longicaudatus occupancy probability increased with high percentages of Rosa rubiginosa, Plantago lanceolata, Rumex acetosella, and Holcus lanatus, while it decreased with an increased cover of Mulinum spinosum and Ochetophila trinervis. The four positively related species are exotic plants. R. rubiginosa, the most conspicuous one, is capable of invading all types of habitats and forms dense shrublands in the ecotone between forest and steppe. These results are partly consistent with diet studies indicating that sweet briar fruits are the main item consumed by colilargos. The relationship of the ANDV main host with such an invasive plant poses a likely increased ANDV transmission risk to local communities making use of sweet briar’s fruits. We discuss further implications of this problem in relation to hantavirus epidemiology in southern Argentina.

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Data availability

The datasets used during the current study are available at: https://github.com/veroandreo/colilargos-sweetbriar

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Acknowledgements

The authors would like to thank Fabian Argel, Bruno San Martin, Francisco Polop, Marcos Torres, Blanca San Martin, Gabriel Martin, and Patricia Codesal for their assistance in different aspects of fieldwork and the identification of plants and mice. We would also like to thank James Mills for kindly reviewing the English language.

Code availability

The scripts used in the current study are available at:https://github.com/veroandreo/colilargos-sweetbriar.

Funding

This work was supported by the Fondo para la Investigación Científica y Tecnológica (FONCyT - PICT/2004 N° 20757), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Fundación Mundo Sano (https://www.mundosano.org/en/) from Argentina.

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Contributions

MCP, JP, and VA designed the study, VA performed the rodent sampling, VA and VH performed the plant sampling, VH identified plants, FC performed the statistical analysis, and FC, VA, and MCP wrote the manuscript. All authors approved the final version.

Corresponding author

Correspondence to Veronica Andreo.

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Conflict of interest

The authors declare no competing interests.

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Communicated by: Thales Renato Ochotorena de Freitas

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Supplementary information

Appendix S1.

Full list of plant species recorded on censuses carried out in the North West of Chubut province (Argentina), 2007–2009 (PDF 108 kb)

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Contreras, F., Andreo, V., Hechem, V. et al. Colilargo’s occupancy and the role of native and exotic plants in hantavirus expansion and transmission risk. Mamm Res 68, 167–176 (2023). https://doi.org/10.1007/s13364-023-00671-9

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  • DOI: https://doi.org/10.1007/s13364-023-00671-9

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