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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
Deep barcode divergence in Brazilian freshwater fishes: the case of the São Francisco River basin
Reflecting possible cases of cryptic speciation and the deeper phylogeographic history of São Francisco fish fauna, with some higher clades extending back into the late Cretaceous and Cenozoic (90 mya), when much of the diversification of the Neotropical region apparently took place. Expand
Competition and phylogeny determine community structure in Müllerian co-mimics
It is shown that resource partitioning and phylogeny determine community structure and outweigh the positive effects of Müllerian mimicry in a species-rich group of neotropical catfishes, and demonstrates that competition for resources is likely to have a dominant role in the structuring of communities that are simultaneously subject to the effects of both positive and negative interactions. 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
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
A cytogenetic study of Diplotnystes mesembrinus (Teleostei, Siluriformes, Diplomystidae) with a discussion of chromosome evolution in siluriforms
The chromosome evolution in Siluriformes is discussed on the basis of available cytogenetic data and it is proposed that 2n=56 is synapomorphic for the order. Expand
Transposable elements as a potential source for understanding the fish genome
The main objective of the present revision is to discuss the aspects of the organization of transposable elements in the fish genome. Expand
Chromosome Studies in Hypoptopomatinae (Pisces, Siluriformes, Loricariidae) : I. XX/XY Sex Chromosome Heteromorphism in Pseudotocinclus tietensis
The cytogenetic analysis of 13 specimens of Pseudotocinclus tietensis showed that this species has 2n=54 chromosomes plus one heteromorphic pair in the males and one homomorphic pair (SM/SM) in the females, suggesting that thisspecies presents a very primitive mechanism of sex chromosome differentiation. Expand
Molecular phylogeny of the armored catfish family Callichthyidae (Ostariophysi, Siluriformes).
The family Callichthyidae comprises eight genera of fishes widely distributed across the Neotropical region. In the present study, sequences of the mitochondrial genes 12S rRNA, 16S rRNA, ND4,Expand