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Can DNA barcoding accurately discriminate megadiverse Neotropical freshwater fish fauna?
This study is the first to examine a large number of freshwater fish species from the Neotropical area, including alarge number of closely related species, and confirmed the efficacy of the barcoding methodology to identify a recently radiated, megadiverse fauna. Expand
Karyotype variability in eight species of the subfamilies Loricariinae and Ancistrinae (Teleostei, Siluriformes, Loricariidae)
The karyotypic analysis of Loricariinae and Ancistrinae species revealed that these groups exhibit a large diversity of diploid numbers, suggesting the occurrence of intense karyotypes evolution during their evolutionary history. Expand
Conservation of the 5S-bearing chromosome pair and co-localization with major rDNA clusters in five species of Astyanax (Pisces, Characidae)
Major and5S ribosomal genes have been localized in chromosomes from five fish species, genus Astyanax, using in situ hybridization (FISH) with 28S and 5S rDNA probes for elucidating evolutionary relationships among closely related taxa. Expand
Structural and ultrastructural analysis of embryonic development of Prochilodus lineatus (Valenciennes, 1836) (Characiforme; Prochilodontidae)
Seven stages of embryo development were identified – zygote, cleavage, blastula, gastrula, segmentation, larval and hatching – after a period of incubation of 22 h (24 °C) or 14 h (28 °C). Expand
Genetic structure of the migratory catfish Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) suggests homing behaviour
The obtained results rejected the panmixia hypothesis, and indicate a strong tendency for fish of this species to utilise their natal nursery regions for reproduction, which represents the first demonstrated example of homing in a freshwater catfish in South America. Expand
Polymorphic nature of nucleolus organizer regions in fishes.
Findings suggest that an increase in the number of ribosomal genes in the NORs of certain species occurred during the evolution of this group. Expand
Non-destructive genetic sampling in fish. An improved method for DNA extraction from fish fins and scales.
The present DNA extraction procedure represents an alternative for population approaches and genetic studies on rare or endangered taxa and becomes a very attractive alternative to obtain large amounts of high-quality DNA for use in different molecular analyses. Expand
Karyotypic relationships among the tribes of Hypostominae (Siluriformes: Loricariidae) with description of XO sex chromosome system in a Neotropical fish species
The family Loricariidae, with about 683 species, is one the largest fish families in the world. The subfamily Hypostominae was recently reviewed and is now divided in five tribes. With the mainExpand
DNA barcodes discriminate freshwater fishes from the Paraíba do Sul River Basin, São Paulo, Brazil
The results demonstrate the utility of barcoding to identify the fauna from this basin, contribute to an enhanced understanding of the differentiation among species, and to help flag the presence of overlooked species. Expand
Synaptonemal complex analysis in spermatocytes of tilapia, Oreochromis niloticus (Pisces, Cichlidae).
All 22 bivalent chromosomes completely paired, except for the occurrence of a size heteromorphism in the terminal region of the largest bivalent associated with the presence of an incompletely paired segment during the synapsis process, which may be the cytological visualization of an XX/XY sex chromosome system in this species. Expand