Astyanax Scabripinnis Species Complex
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Astyanax taurorum a new species from dos Touros River, Pelotas River drainage, an upland southern Brazilian river (Characiformes: Characidae)
ABSTRACT A new species of Astyanax belonging to the Astyanax scabripinnis complex is described from dos Touros River, tributary of the Pelotas River, Uruguay River basin. Astyanax taurorum sp. nov. is distinguished from other species of the Astyanax scabripinnis species complex by having two humeral spots, the first vertically elongated; teeth of inner row o
Zoologia (Curitiba). Publicado em: 23/10/2017
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2. Evidence of incipient speciation in Astyanax scabripinnis species complex (Teleostei: Characidae)
Duas populações do complexo Astyanax scabripinnisisoladas por uma queda d´água de mais de 100 metros de altura e localizadas em diferentes altitudes do mesmo rio (662 m e 1850 m a.s.l.) foram comparadas através de dados de reprodução, cariótipo, morfometria geométrica, morfologia dentária, e número de raios da nadadeira anal, de modo a testar a hi
Neotrop. ichthyol.. Publicado em: 2014-06
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3. ASPECTOS EVOLUTIVOS E DIFERENCIAÇÃO DE POPULAÇÕES DE Astyanax scabripinnis (CHARACIDAE, INCERTAE SEDIS)
The species complex Astyanax scabripinnis are composed by fish with wide geographic distribution. Their populations are often isolated in small streams, separated by thousands of years, making it a very interesting system to study evolution. The use of different markers is crucial, since they allow inferences on the identification of individuals and therefor
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/02/2012
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4. A comparative structural cytogenetic study in three allopatric populations of Astyanax scabripinnis (Teleostei: Characidae)
Individual samples from five populations of the characid fish Astyanax scabripinnis (Jenyns, 1842) from the Tietê and Paranapanema river basins (Brazil) were studied. All individuals analyzed presented 50 chromosomes but three different karyotypic forms were observed. Additionally, some individuals of one karyomorph presented a macro supernumerary chromosom
Zoologia (Curitiba). Publicado em: 2012-04
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5. Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system
O gênero Astyanax é destacado entre os Characiformes, pelo grande número de espécies encontradas e a ampla distribuição geográfica. Neste trabalho, foram analisados citogeneticamente espécimes de Astyanax laticeps do sistema da laguna do Patos. O número diplóide observado foi de 2n = 50 cromossomos distribuídos em 6m+16sm+16st+12a (NF= 88), sem di
Publicado em: 2010
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6. Comparative cytogenetics among species of the Astyanax scabripinnis complex: evolutionary and biogeographical inferences
Karyotype data are presented for distinct species of the genus Astyanax from four rivers belonging to three different hydrographic basins of the State of Paraná, Brazil (Verde River - Tibagi basin, Açungui River - Ribeira basin, and Santo Antônio and Jaguariaíva Rivers - Jaguariaíva basin). Three karyotypic forms were identified, here denominated karyot
Genetics and Molecular Biology. Publicado em: 2008
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7. Two new species of Astyanax (Ostariophysi: Characiformes: Characidae) from eastern Brazil, with a synopsis of the Astyanax scabripinnis species complex
Duas novas espécies de Astyanax são descritas do leste do Brasil: A . microschemos, do córrego Palmital, drenagem do rio Itapemirim, Espírito Santo e A . pelecus, do rio Pardo, Bahia. Astyanax microschemos difere das demais espécies do gênero pela pequena altura do corpo de 26,9-29,7% no comprimento padrão, uma única mancha umeral verticalmente along
Neotropical Ichthyology. Publicado em: 2006-03
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8. Análise filogeográfica de Astyanax scabripinnis (Characiformes, Characidae) da região de Campos do Jordão (SP).
The lambaris, which include small Astyanax scabripinnis fish, inhabit the headwaters of small streams, forming well known populational isolates. These populations are possibly inbred, presenting little or no gene flow and reduced size. It is believed that these characteristics have aided the fixation of a pronounced karyotypic variability, contributing to th
Publicado em: 2006
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9. Diversidade de peixes residentes em cabeceiras de rios. Uma abordagem cromossômica em três diferentes biomas aquáticos da Região Sul do Brasil.
This study presented cytogenetic analysis of small fishes species collected in the headwaters of Jaguariaíva, Ribeira and, Tibagi rivers. Some of these species have had a comparative cytogenetic population analysis among different basins, while in the others were observed inherent specific problems only in one population. In this work we boarded cytogenetic
Publicado em: 2006