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Ciliate diversity in rodrigo de freitas lagoon (Rio de Janeiro, Brazil) from an integrative standpoint

  • Environmental Microbiology - Research Paper
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Abstract

The Rodrigo de Freitas Lagoon is a highly eutrophic lacustrine system and has one of the longest histories of exploration and anthropic alteration in Brazil. Despite its relevance, limited studies explored the diversity of micro-eukaryotes in the lagoon. Ciliates (Alveolata, Ciliophora) are overlooked in environmental microbiology, especially in tropical and subtropical ecosystems, resulting in limited knowledge about their diversity and functional relevance in South American habitats, particularly in coastal lagoons. To fill this gap, here we investigated the diversity of ciliates in a brackish coastal lagoon in an urban area of Rio de Janeiro, Brazil, applying and comparing the performance of morphological and metabarcoding approaches. The metabarcoding analysis, based on high-throughput sequencing of the hipervariable region V4 of the 18S rRNA genes detected 37 molecular operational taxonomic units (MOTUs) assigned to Ciliophora, representing only about a half (56.9%) of the diversity detected by microscopy, which counted 65 ciliate morphotypes. The most representative classes in both approaches were Spirotrichea and Oligohymenophorea. The metabarcoding analysis revealed that 35.3% of the ciliate MOTUs had less than 97% similarity to available sequences in the NCBI database, indicating that more than one-third of these MOTUs potentially represents still not represented or undescribed ciliate species in current databases. Our findings indicate that metabarcoding techniques can significantly enhance the comprehension of ciliate diversity in tropical environments, but the scarcity of reference sequences of brackish ciliates in molecular databases represents a challenge to the taxonomic assignment of the MOTUs. This study provides new insights into the diversity of ciliates in a threatened coastal lagoon, revealing a vast array of still unknown and rare ciliate taxonomic units in tropical environments.

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Acknowledgements

This work was financed by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) through grants conceded to P.H.C.N. (140627/ 2019-7), T.S.P. (421766/2021-2) and I.D.S.N. (304093/2016-5; 311577/2019-9); and Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) to N.M.F (E-26/202.325/2018; E-26/202.326/2018).

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  1. Laboratório de Protistologia, Departamento de Zoologia, Universidade Federal Do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil

    Pedro H. Campello-Nunes, Inácio D. da Silva-Neto, Thiago da S. Paiva & Noemi M. Fernandes

  2. Laboratório de Genética Molecular de Eucariontes E Simbiontes, Departamento de Genética, Universidade Federal Do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil

    Carlos A. G. Soares

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  1. Pedro H. Campello-Nunes
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Campello-Nunes, P.H., da Silva-Neto, I.D., da S. Paiva, T. et al. Ciliate diversity in rodrigo de freitas lagoon (Rio de Janeiro, Brazil) from an integrative standpoint. Braz J Microbiol 55, 1489–1505 (2024). https://doi.org/10.1007/s42770-024-01291-4

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  • DOI: https://doi.org/10.1007/s42770-024-01291-4

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