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Molecular Evidences of a Hidden Complex Scenario in Leporinus cf. friderici

Texto completo
Silva-Santos, Rosane [1] ; Ramirez, Jorge L. [1] ; Galetti, Jr., Pedro M. [1] ; Freitas, Patr-Cia D. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Fed Sao Carlos, Dept Genet & Evolucao, Lab Biodiversidade Mol & Conservacao, Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: FRONTIERS IN GENETICS; v. 9, FEB 15 2018.
Citações Web of Science: 3

The megadiversity of the neotropical ichthyofauna has been associated to recent diversification processes, reflecting in subtle or lacking morphological differentiation between species, challenging the classical taxonomic identification. Leporinus friderici occurs in several river basins of South America, and its nominal taxonomic validity has been questioned. Its wide distribution within the Brazilian Shield suggests that this species could be genetically structured among the hydrographic basins, despite a sharp morphological similarity. In this study, we performed phylogenetic analyses, based on three nuclear (recombination activating gene 1, RAG1, recombination activating gene 2, RAG2, and myosin heavy chain 6 cardiac muscle alpha gene, Myh6) and two mitochondrial (COI and Cytochrome b, Cytb) markers, in specimens morphologically similar to L. friderici and related species from different hydrographic basins in South America. Our phylogenetic tree identified four well-supported clades, which point out to the existence of taxonomic inconsistencies within this fish group. A clade named L. cf. friderici sensu stricto included eight Molecular Operational Taxonomic Units recently diversified in the Brazilian Shield basins. These results were also confirmed by a single-gene species delimitation analysis. It is suggested that this clade includes a species complex, characterizing taxonomic uncertainties. Another clade recovered only L. friderici from the Suriname rivers, validating this nominal species in its type locality. A third no-named clade, characterized by deeper species divergence, recovered five different nominal species interleaved with other undescribed forms previously also recognized as L. cf. friderici, indicating taxonomic errors. The fourth clade only included L. taeniatus. Our results showed a complex scenario involving the morphotype L. cf. friderici and allowed us to address aspects related to evolutionary diversification of this fish group and historical processes involved with, highlighting the importance of revealing hidden biodiversity for the taxonomy and conservationist action plans of these fish. (AU)

Processo FAPESP: 11/21836-4 - Filogenia molecular dos anostomidae e filogeografia das espécies com cromossomos sexuais zz/zw do gênero leporinus
Beneficiário:Jorge Luis Ramirez Malaver
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 10/52315-7 - Predadores de topo de cadeia alimentar
Beneficiário:Pedro Manoel Galetti Junior
Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Regular