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Master's Dissertation
DOI
https://doi.org/10.11606/D.41.2008.tde-16042008-140210
Document
Author
Full name
Vania Quibao Pretti
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Toledo, Lurdes Foresti de Almeida (President)
Menezes, Naercio Aquino
Pellegrino, Katia Cristina Machado
Title in Portuguese
Relações filogenéticas no gênero Acestrorhynchus (Teleostei, Characiformes), com base na análise de genes nucleares e mitocondriais
Keywords in Portuguese
Acestrorhynchus
Filogenia molecular
Abstract in Portuguese
O gênero Acestrorhynchus encontra-se amplamente distribuído na América do Sul, estando presente nas bacias do Paraná-Paraguai, Uruguai, no rio São Francisco, nos rios costeiros das Guianas, e nas bacias dos rios Amazonas e Orinoco, sendo as duas últimas, o local onde se encontra a maior diversidade desses peixes. Na ausência de estudos mais detalhados sobre as relações filogenéticas entre as espécies de Acestrorhynchus, as 14 espécies reconhecidas têm sido agrupadas com base no seu padrão de coloração. O primeiro trabalho focalizando as relações filogenéticas das espécies de Acestrorhynchus, foi desenvolvido recentemente e estabelece as relações de parentesco de 13 espécies do gênero com base na análise de 104 características osteológicas e de morfologia externa. No presente estudo, 2139 pares da região 16S e da ATPase, ambos do genoma mitocondrial, juntamente o primeiro íntron da proteína ribossomal S7 do genoma nuclear, foram analisados para as espécies A. microlepis, A. falcatus, A. heterolepis, A pantaneiro, A. falcirostris, A. altus, A. minimus, A. grandoculis, A. britskii, A. lacustris e A. nasutus. Os gêneros Roeboides, Rhaphiodon e Gephyrocharax foram utilizados como grupo externo. A análise de máxima parcimônia, com busca heurística e adição aleatória de seqüências com o algoritmo TBR resultou na obtenção de uma árvore mais parcimoniosa com 2.551 passos. Os índices de consistência e retenção foram, respectivamente, 0,633 e 0,533. Os resultados obtidos através da análise dos dados moleculares corroboram, assim como os resultados morfológicos, o monofiletismo dos agrupamentos propostos com base nos padrões de coloração.
Title in English
Phylogenetic relationships among Acestrorhynchus (Teleostei, Characiformes) inferred from analysis of nuclear and mitochondrial sequence data
Keywords in English
Acestrorhynchus
Molecular Phylogeny
Abstract in English
Fishes of the Neotropical characiform genus Acestrorhynchus Eigenmann, comprise freshwater species widely distributed throughout South American rivers, being found in the Paraná, Paraguai, Uruguai, São Francisco and of Guyana rivers. However it is in the Amazonas and Orinoco river basins where the highest diversity of this group of fishes is present. In the absence of more detailed phylogenetic studies the 14 recognized species are grouped on the basis of their color patterns. The first specific study about the phylogenetic relationships of Acestrorhynchus species, was recently developed and it established the relationships of 13 species of the genus, based in the analysis of 104 osteological and external morphological characters. In the present study, simultaneous analysis of 2139 aligned base pairs from the mitochondrial 16S and ATPase and the nuclear first intron of the S7 ribosomal protein were analyzed for the species A. microlepis, A. falcatus, A. heterolepis, A pantaneiro, A. falcirostris, A. altus, A. minimus, A. grandoculis, A. britskii, A. lacustris e A. nasutus. The genera Roeboides, Rhaphiodon and Gephyrocharax were included in the analysis as outgroups. Maximum parsimony analysis, and heuristic searches with random taxon addition replicates and TBR branch swapping were performed resulting in one most parsimonious tree with 2,551 steps in length. The consistence index and retention index were 0,633 and 0,533, respectively. The results revealed with molecular data as well as the ones obtained with morphological characters corroborate, the monophyly of the genus and the grouping proposed based in the color pattern.
 
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vania_pretti.pdf (2.69 Mbytes)
Publishing Date
2008-06-04
 
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