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Changes in parasite communities of fishes from an intermittent river in the Brazilian semi-arid, after a major interbasin water transfer

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Abstract

Rivers interlinking by transposition projects have multiplied in the world, altering the landscape and flow regime of continental water systems. Recently, an intermittent river in northeastern Brazil has been artificially connected to the São Francisco River basin in a water transfer project. Thus, this study aims to provide an inventory of the fish parasites from the Jaguaribe River basin in the scenarios of pre- and post-transposition, and to evaluate the short-term impacts on the parasite fauna. Of the analyzed fishes, belonging to 31 species, about 30% were parasitized. A total of 47 parasite taxa were recovered, including monogeneans (17), digeneans (9), nematodes (9), acanthocephalans (3) and crustaceans (6), and unidentified cysts of Acanthocephala, Cestoda and Digenea, representing the description of 30 new geographic records and 104 new parasite-host associations. By expanding the range of the geographic distribution of fish parasites and increasing the list of hosts, the study contributes to the knowledge of fish parasites biodiversity in the semi-arid region of Brazil and in the Caatinga domain. Considering all parasite species, significant differences were observed in total prevalence, total mean abundance, diversity index and host specificity index; the highest values of total prevalence and total mean abundance were observed in the post-transposition, while the diversity index and host specificity index was higher in the pre-transposition period. This is the first study evaluating fish parasites before and after a major water transfer event and the results will allow further evaluation of middle and long-term changes in the specific composition of fish and parasites from the receiver drainages.

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Data is available from the corresponding author upon reasonable request.

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Acknowledgements

The authors are grateful to Nathália Correia Martins and Bruno Anderson Fernandes da Silva for help with dissection of hosts and identification of parasites, to Lucca Vilar Sorrentino and Lucas Pessoa for help in the host samplings. We also thank the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for funding JMF through a PhD scholarship (Financing Code: 001) and Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico (FUNCAP) for funding JMF through a postdoctoral fellowship (Process Number: 0213-00077.01.01/23). We also thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for funded VMML through a master scholarship, and for the research fellowship to FHY (Grant Number: 304502/2022-7).

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Conceptualization: ACFL, TPAR and JMF. Develo** methods: JMF, FHY and VMML. Data analysis: JMF. Preparation of figures and tables: JMF and TPAR. Conducting the research, data interpretation, writing: JMF and VMML with contributions from all co-authors.

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Correspondence to Julia Martini Falkenberg.

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Falkenberg, J.M., de Lima, V.M.M., Yamada, F.H. et al. Changes in parasite communities of fishes from an intermittent river in the Brazilian semi-arid, after a major interbasin water transfer. Aquat Ecol (2024). https://doi.org/10.1007/s10452-024-10112-7

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  • DOI: https://doi.org/10.1007/s10452-024-10112-7

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