Results 1 to 10 of about 722 (134)

Population structure of two Astyanax Baird & Girard, 1854 (Teleostei, Characidae) species from upper Paraguaçu river

Brazilian Archives of Biology and Technology, 2008
The fishes of the family Characidae are among the main species of fresh water fishes in South America. In this work, some aspects of the population structure of two Astyanax species were assessed.
Alexandre Clistenes de Alcântara Santos, José Luís Costa Novaes   +1 more
doaj   +1 more source

Identification of Astyanax altiparanae (Teleostei, Characidae) in the Iguaçu River, Brazil, based on mitochondrial DNA and RAPD markers

Genetics and Molecular Biology, 2002
Astyanax fishes are among the most important food-web components of South America rivers. In the Iguaçu River basin, the Astyanax genus is represented mainly by endemic species.
Prioli Sônia M.A.P., Prioli Alberto J., Júlio Jr. Horácio F., Pavanelli Carla S., Oliveira Alessandra V. de, Carrer Helaine, Carraro Dirce M., Prioli Laudenir M.   +7 more
doaj   +3 more sources

Astyanax taurorum a new species from dos Touros River, Pelotas River drainage, an upland southern Brazilian river (Characiformes: Characidae)

Zoologia (Curitiba), 2017
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.
Carlos Alberto S. de Lucena, Amanda Bungi Zaluski, Zilda Margarete Seixas de Lucena   +2 more
doaj   +1 more source

New small-sized species of Astyanax (Characiformes: Characidae) from the upper rio Paraguai basin, Brazil, with discussion on its generic allocation [PDF]

Neotropical Ichthyology, 2022
A new species of Astyanax is described from the rio Salobra, tributary of rio Cuiabá, rio Paraguai basin. The new taxon can be distinguished from its congeners by having a well-defined dark midlateral stripe on body extending from the posterior margin of
Fernando C. P. Dagosta, Manoela M. F. Marinho   +1 more
doaj   +1 more source

Cytotaxonomy, heterochromatic polymorphism and natural triploidy of a species of Astyanax (Pisces, Characidae) endemic to the Iguaçu river basin

Brazilian Archives of Biology and Technology, 2007
Cytogenetic analysis with Astyanax sp. D revealed a karyotype of 2n=50 with 2M+26SM+6ST+16A, besides a triploid specimen showing 2n=75 chromosomes (3M+39SM+9ST+24A). C-banding strongly stained the terminal regions of several SM-ST-A chromossomes.
Daniel Luis Zanella Kantek, Rafael Bueno Noleto, Alberto Sérgio Fenocchio, Marta Margarete Cestari   +3 more
doaj   +1 more source

Food resource partitioning among species of Astyanax (Characiformes: Characidae) in the Lower Iguaçu River and tributaries, Brazil [PDF]

Neotropical Ichthyology, 2019
Resource partitioning allows for interspecific coexistence and is frequently reported for similar species. Here, we predicted the existence of resource partitioning among species of Astyanax that co-occur in the Low Iguaçu River and tributaries in Brazil.
Suelen F. R. Pini, Milza C. F. Abelha, Elaine A. L. Kashiwaqui, Rosilene L. Delariva, Sergio Makrakis, Maristela C. Makrakis   +5 more
doaj   +1 more source

A redescription of Astyanax gymnodontus (Eigenmann, 1911), new combination, a polymorphic characid fish from the rio Iguaçu basin, Brazil

Neotropical Ichthyology
Astyanax gymnodontus (Eigenmann, 1911), new combination, a polymorphic characid fish endemic to the Rio Iguaçu basin in Southern Brazil, is redescribed.
Carla Simone Pavanelli, Carlos Alexandre Miranda Oliveira   +1 more
doaj   +1 more source

Basic cytogenetics and physical mapping of ribosomal genes in four Astyanax species (Characiformes, Characidae) collected in Middle Paraná River, Iguassu National Park: considerations on taxonomy and systematics of the genus

Comparative Cytogenetics, 2015
Karyotypes and chromosomal characteristics of both minor and major rDNAs in four fish species known popularly as “lambaris”, namely Astyanax abramis (Jenyns, 1842), Astyanax asuncionensis Géry, 1972, Astyanax correntinus (Holmberg, 1891) and Astyanax sp.
Leonardo Paiz, Lucas Baumgärtner, Weferson Júnio da Graça, Vladimir Margarido   +3 more
doaj   +1 more source

Highlighting Astyanax Species Diversity through DNA Barcoding. [PDF]

PLoS ONE, 2016
DNA barcoding has been used extensively to solve taxonomic questions and identify new species. Neotropical fishes are found in a wide variety of shapes and sizes, with a large number of species yet to be described, many of which are very difficult to ...
Bruno César Rossini, Carlos Alexandre Miranda Oliveira, Filipe Augusto Gonçalves de Melo, Vinicius de Araújo Bertaco, Juan M Díaz de Astarloa, Juan J Rosso, Fausto Foresti, Claudio Oliveira   +7 more
doaj   +1 more source

Cytogenetic markers as a tool for characterization of hybrids of Astyanax Baird & Girard, 1854 and Hyphessobrycon Eigenmann, 1907 [PDF]

Comparative Cytogenetics, 2020
Astyanax Baird et Girard, 1854, is one of the largest genera in the family Characidae and comprises 177 valid species. This genus has been the focus of cytogenetic studies primarily owing to the presence of B chromosomes and high karyotypic diversity ...
Caio Augusto Gomes Goes, Sandro Natal Daniel, Lucas Henrique Piva, George Shigueki Yasui, Roberto Ferreira Artoni, Diogo Teruo Hashimoto, Fausto Foresti, Fábio Porto-Foresti   +7 more
doaj   +3 more sources