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Trophic ecology and metabolism of two species of nonnative freshwater stingray (Chondrichthyes: Potamotrygonidae)

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Abstract

The stingrays Potamotrygon amandae and Potamotrygon falkneri are nonnative species established in the Upper Paraná basin. Although they are widely distributed, few studies on their diets or respective metabolic responses exist. Therefore, the aim was to evaluate the dietary composition, trophic niche breadth and lipid/protein concentrations in muscle and hepatic tissues of these two species, as well as the interrelationships between them. The individuals were collected in two areas on the Upper Paraná River. The stomachs and samples of muscle and liver tissues were taken for analysis. A broad dietary spectrum was observed for both species, along with differences in dietary composition, with a higher consumption of detritus by P. amandae and Baetidae by P. falkneri. No differences were observed in the trophic niche breadth. Regarding the metabolic variables, differences were only found in the hepatic protein, with a higher content observed in P. falkneri. A significant positive correlation was observed between items of animal origin and detritus with muscle protein for this species. This shows that such feeding habits, which are characteristic of a generalist, influenced the metabolism of the species and possibly contributed to the successful adjustment of the species to new habitats in the Upper Paraná River.

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Acknowledgements

The authors are grateful to the Engineering Faculty of Ilha Solteira (FEIS/UNESP), for the use of laboratory facilities and logistics. We would also like to thank MSc. Douglas Ribeiro Castro for his assistance in the collection and identification of fish and Prof. Dr. Francisco Langeani Neto for assistance with fish identification (Institute of Biosciences, Humanities and Exact Sciences - IBILCE/UNESP) and Dr. Hugo Marques for comments on the manuscript. This study was supported by the São Paulo Research Foundation (FAPESP), Process number 2015/21936-0 (for the scholarship of C.D.P.), Process number 2016/11736-6 (for the scholarship of L.S) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. I.P.R. is supported by the National Council for Scientific and Technological Development (CNPq) (process 303311/2018-5).

Funding

This work was granted by Process no 2015/21936-0 and no 2016/11736-6, São Paulo Research Foundation (FAPESP) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.

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Authors and Affiliations

  1. Departamento de Biologia e Zootecnia, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista (UNESP), Rua Monção, Zona Norte, Ilha Solteira, SP, 15385-000, Brazil

    Cibele Diogo Pagliarini, Cristiéle da Silva Ribeiro, Lucas Spada, Luciano Alves dos Anjos & Igor Paiva Ramos

  2. Programa de Pós-Graduação em Ciências Biológicas - Zoologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista (UNESP), Rua Prof. Dr. Antônio Celso Wagner Zanin 250, Distrito de Rubião Junior, Botucatu, SP, 18618-689, Brazil

    Cibele Diogo Pagliarini, Luciano Alves dos Anjos & Igor Paiva Ramos

  3. Programa de Pós-Graduação em Ciências Biológicas - Fisiologia Geral, Instituto de Biociências, São Paulo, Universidade de São Paulo (USP), Rua do Matão, Travessa 14, 321, Cidade Universitária, São Paulo, SP, 05508-090, Brazil

    Cristiéle da Silva Ribeiro & Lucas Spada

  4. Programa de Pós-Graduação em Conservação e Manejo de Recursos Naturais, Centro de Ciências Biológicas e da Saúde, Universidade Estadual do Oeste do Paraná (UNIOESTE), Rua Universitária, 2069, Jardim Universitário, Cascavel, PR, 85819110, Brazil

    Rosilene Luciana Delariva

  5. Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista (UNESP), Rua Cristóvão Colombo, 2265, São José Do Rio Preto, SP, 15054-000, Brazil

    Jumma Miranda Araújo Chagas

  6. Instituto de Biociências de Botucatu, Universidade Estadual Paulista (UNESP) “Júlio de Mesquita Filho”, Rua Professor Doutor Antonio Celso Wagner Zanin, s/nº, Botucatu, SP, 18618-689, Brazil

    Cibele Diogo Pagliarini

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  1. Cibele Diogo Pagliarini
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  2. Cristiéle da Silva Ribeiro
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Author contributions

All authors contributed to the study conception and design. Conceived and designed the experiments: CDP; CSR and IPR (Supervisor). Made the collections: CDP; JMAC; LS; CSR and LAA Performed the experiments: CDP; LS; IPR and CSR Analyzed the data: CDP; IPR; CSR and RLD Wrote the paper: CDP; IPR; CSR and RLD.

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Correspondence to Cibele Diogo Pagliarini.

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Pagliarini, C.D., da Silva Ribeiro, C., Spada, L. et al. Trophic ecology and metabolism of two species of nonnative freshwater stingray (Chondrichthyes: Potamotrygonidae). Hydrobiologia 847, 2895–2908 (2020). https://doi.org/10.1007/s10750-020-04283-1

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