Molecular characterization of Astyanax species (Characiformes: Characidae) from the upper Paraguacu River basin, a hydrographic system with high endemism

Autor(es)

Silva-Santos, Rosane ; Machado, Carolina de Barros ; Zanata, Angela Maria ; Camelier, Priscila ; Galetti, Pedro Manoel ; de Freitas, Patricia Domingues

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 21, n. 2, p. 19-pg., 2023-01-01.

Resumo

Molecular tools have been employed to improve the knowledge about freshwater Neotropical fishes. Such approaches supporting studies of groups including species complexes such as Astyanax , one of the most diversified and taxonomically complex genus of the family Characidae. Here, we employed species delimitation analyses in four Astyanax species described for the upper Paraguacu River basin, a drainage within Northeastern Mata Atlantica freshwater ecoregion with high endemism. We implemented single and multilocus approaches based on two mitochondrial and one nuclear markers. Cytochrome c Oxidase I sequences previously available for Astyanax species were also added to our dataset. The single locus analyses showed A. epiagos , A. rupestris , and A. aff. rupestris as different Molecular Operational Taxonomic Units (MOTUs), while A. brucutu and A. lorien were grouped. However, the multilocus approach distinguished these two species and showed congruence for the remaining single locus results. Astyanax aff. rupestris was separated into two MOTUs using both approaches, highlighting the need for an integrative taxonomic revision including A. aff. rupestris. These findings contribute to a better understanding of the diversity of this fish group in the upper Paraguacu, identifying hidden diversity and reinforcing the relevance of this hydrographic system as a notable hotspot for ichthyofauna biodiversity endemism. (AU)

• Processo FAPESP: 16/19075-9 - Diversidade e evolução de Gymnotiformes (Teleostei, Ostariophysi)
• Beneficiário: Naercio Aquino Menezes
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 10/52315-7 - Predadores de topo de cadeia alimentar
• Beneficiário: Pedro Manoel Galetti Junior
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular
• Processo FAPESP: 17/09321-5 - Characiformes miniaturas (Teleostei: Ostariophysi): evolução, diversidade e biogeografia
• Beneficiário: Manoela Maria Marinho Koh
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Jovens Pesquisadores