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The species composition of local flea assemblages at a small scale in two South American regions is predominantly driven by niche-based mechanisms

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Abstract

We applied a step-down factor analysis (SDFA) and multi-site generalised dissimilarity modelling (MS-GDM) to local flea communities harboured by small mammals (i.e., collected at small sampling sites over a short time period) in two South American regions (Patagonia and the Northwestern Argentina) with the aim of understanding whether these communities were assembled via niche-based or dispersal-based processes. The SDFA allows us to determine whether clusters of flea assemblages across different types of climates, vegetation and soils can be distinguished (suggesting niche-based assembly). MS-GDM allows us to determine whether a substantial proportion of the variation in flea species turnover is explained by specific climate-associated, vegetation-associated and soil-associated variables (indicating niche-based assembly) or host turnover (indicating dispersal-based assembly). Mapping of assemblages on climate, vegetation and soil maps, according to their loadings on axis 1 or axis 2 of the SDFA, did not provide clear-cut results. Clusters of similar loadings could be recognized within some, but not other, climate, vegetation and soil types. However, MS-GDM demonstrated that the effect of environmental variables (especially air temperature) on flea compositional turnover was much stronger than that of host turnover, indicating the predominance of niche-based processes in local community assembly. A comparison of our results with those on the mechanisms that drive species assembly in regional communities allows us to conclude that local and regional communities result from the joint action of niche-based and dispersal-based processes, with the former more important at a smaller spatial scale and the latter at a larger spatial scale.

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Data supporting this paper can be obtained from corresponding author upon reasonable request.

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Acknowledgements

We thank Ulyses F.J. Pardiñas and Daniel Udrizar Sauthier (Centro Nacional Patagónico CENPAT, Puerto Madryn, Argentina) for their help with mammal identification in Patagonia and members of the Instituto de Investigaciones de Biodiversidad Argentina (PDBA) for their help with the field and laboratory work in the Northwestern Argentina.

Funding

Sampling in Patagonia was supported by the Agencia Nacional de Promoción de la Investigación, el Desarrollo Tecnológico y la Innovación (PICT2010-338), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) (PIP 0146) and the Universidad Nacional de La Plata (UNLP N752). Field sampling in the Northwestern Argentina was supported by the National Science Foundation (BSR-8906665) and CONICET (PIP N 4963 and 1587).

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M. Fernanda López Berrizbeitia, Juliana P. Sanchez, M. Mónica Díaz and Marcela Lareschi collected data. Boris R. Krasnov, Irina S. Khokhlova and Vasily I. Grabovsky analysed data. Boris R. Krasnov wrote the first version of the manuscript. All authors finalized the manuscript.

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Correspondence to Boris R. Krasnov.

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Sampling and procedures in Patagonia were carried out under permits from the Dirección de Fauna y Flora Silvestre de la Provincia del Chubut, Nos. 34/06, 38/08 and 71/2011. Sampling and procedures in the Northwestern Argentina were carried out under permits from the Secretaria de Biodiversidad de Jujuy (No. 025/2019-S.B), Secretaria de Ambiente y Desarrollo sustentable de Salta (No. 000163), Dirección de Flora, Fauna Silvestre y Suelos de la Provincia de Catamarca and Tucumán (No. 213–13 and No. 84–19) and Dirección General de Bosques y Fauna de la Provincia de Santiago del Estero (No. 1351/2017). All animals were handled in accordance with the animal care and use guidelines of the American Society of Mammalogists (Sikes 2016).

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BRK is a Section Editor of Parasitology Research. Other authors declare that they have no competing interests.

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Krasnov, B.R., Berrizbeitia, M.F.L., Sanchez, J.P. et al. The species composition of local flea assemblages at a small scale in two South American regions is predominantly driven by niche-based mechanisms. Parasitol Res 122, 571–583 (2023). https://doi.org/10.1007/s00436-022-07759-2

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