Busca avançada
Ano de início
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The Bunocephalus coracoideus Species Complex (Siluriformes, Aspredinidae). Signs of a Speciation Process through Chromosomal, Genetic and Ecological Diversity

Texto completo
Ferreira, Milena ; Garcia, Caroline ; Matoso, Daniele A. ; de Jesus, Isac S. ; Cioffi, Marcelo de B. ; Bertollo, Luiz A. C. ; Zuanon, Jansen ; Feldberg, Eliana
Número total de Autores: 8
Tipo de documento: Artigo Científico
Fonte: FRONTIERS IN GENETICS; v. 8, SEP 21 2017.
Citações Web of Science: 4

Bunocephalus is the most species-rich Aspredinidae genus, corresponding to a monophyletic clade with 13 valid species. However, many species have their classification put in question. Here, we analyzed individuals from four Amazonian populations of Bunocephalus coracoideus by cytogenetic and molecular procedures. The geographic distribution, genetic distances and karyotype data indicate that each population represents an Evolutionary Significant Unit (ESU). Cytogenetic markers showed distinct 2n and karyotype formulas, as well as different numbers and locations of the rDNA sites among ESUs. One of such populations (ESU-D) highlighted an extensive polymorphic condition, with several cytotypes probably due to chromosomal rearrangements and meiotic non-disjunctions. This resulted in several aneuploid karyotypes, which was also supported by the mapping of telomeric sequences. Phylograms based on Maximum Likelihood (ML) and Neighbor Joining (NJ) analyses grouped each ESU on particular highly supported clades, with the estimation of evolutionary divergence indicating values being higher than 3.8-12.3% among them. Our study reveals a huge degree of chromosomal and genetic diversity in B. coracoideus and highly points to the existence of four ESUs in allopatric and sympatric speciation processes. In fact, the high divergences found among the ESUs allowed us to delimitate lineages with taxonomic uncertainties in this nominal species. (AU)

Processo FAPESP: 16/22196-2 - Uma abordagem intercontinental para a investigação da evolução cromossômica na ordem Osteoglossiformes (Teleostei: Osteoglossomorpha). Parte II
Beneficiário:Marcelo de Bello Cioffi
Linha de fomento: Auxílio à Pesquisa - Regular