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High plasticity in short- and medium-scale movements in two catfish species from the Paraná Basin

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Abstract

Oxydoras kneri and Hemisorubim platyrhynchos are catfish species of high ecological and commercial relevance from the Paraná River (La Plata Basin, South America) whose life history remains unknown. The aim of this study was to reveal the nursery areas and describe the habitat use throughout the ontogeny of both catfish species from the Paraná River using the otolith 87Sr/86Sr ratio. Otolith core-to-edge 87Sr/86Sr analyses were measured using a LA-MC-ICPMS system. A Quadratic Discriminant Analysis (Wilks’ Lambda = 0.029, p < 0.0001) based on the water 87Sr/86Sr baseline of the La Plata Basin was run to infer the natal origin using the core 87Sr/86Sr ratio as an independent variable. Oxydoras kneri was classified as originating from Paraguay (35.7%), middle Paraná (57.1%), and upper Paraná (7.1%) rivers, while H. platyrhynchos was classified as originating from the middle (56.3%) and upper (43.7%) Paraná River. Otolith 87Sr/86Sr time series suggested a high complexity in the stock structure of both species from upper Paraná River, with a significant contribution of specimens originating in other areas. Both species showed isotopic variations in their otoliths compatible with short- and medium-scale movements between different reaches of the Paraná and Paraguay rivers that could exceed 200 km.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

Authors thank to Consejo Nacional de Investigaciones Científicas y Técnicas (PIP 11220200103264CO), Universidad de Buenos Aires (2020 Mod I. 20020190100069BA) and Agencia I+D+i (PICT-2019-03888) for the financing granted for the preparation of the samples. We thank the editor and the three anonymous reviewers for their detailed comments that helped improve this manuscript.

Funding

Funding for the fish collections was provided by the Comisión Mixta del Río Paraná (COMIP-UNNE), while the analyses were supported by the Laboratory of Biology of Aquatic Organisms and Ecosystems (BOREA, Musée d’Histoire Naturelle, Paris).

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Correspondence to Esteban Avigliano.

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Oxydoras kneri and Hemisorubim platyrhynchos are not included in the IUCN list of endangered species. Fish handling during sampling was performed following guidelines of the ethical committee of the UFAW Handbook on the Care and Management of Laboratory Animals (http://www.ufaw.org.uk). Collection of fish was authorized by the local Wildlife and Fisheries Authority guidelines and policies (Dirección de Recursos Naturales of Corrientes Province, Law 1863/54). The fish in this study were not a part of faunal surveys and they did not employ any type of experimental procedure, surgery or chemical agents that would induce injury on the collected organisms.

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The authors declare no competing interests.

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Avigliano, E., Pouilly, M., Silva, N. et al. High plasticity in short- and medium-scale movements in two catfish species from the Paraná Basin. Environ Biol Fish 106, 541–552 (2023). https://doi.org/10.1007/s10641-023-01390-5

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  • DOI: https://doi.org/10.1007/s10641-023-01390-5

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