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Evolutionary dynamics of rRNA gene clusters in cichlid fish
TLDR
The organization of rRNA gene clusters seems to reflect their intense and particular evolutionary pathway and not the evolutionary history of the associated taxa, reinforcing the notion that the integration of cytogenetic data and genomic analysis provides a more complete picture for understanding the organization of repeated sequences in the genome.
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Chromosome differentiation patterns during cichlid fish evolution
TLDR
Karyotypes of one Asian, 22 African, and 30 South American cichlid species were investigated, and chromosomal data of the family was collected to increase the understanding of chromosome evolution among cichLid species.
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A Heteromorphic ZZ/ZW Sex Chromosome System in Fish, Genus Hypostomus (Loricariidae)
TLDR
The available data indicate that the differentiation of this sex chromosome system may have occurred by a pericentric inversion, followed by length reduction in an ancestral chromosome similar to the Z one, originating a W chromosome like that now observed in the female karyotype of this fish species.
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New cases of supernumerary chromosomes in characiform fishes
TLDR
The widespread occurrence of these extra chromosomal elements in Neotropical characiform fishes suggests their independent origins.
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The karyotypes of the thorny catfishes Wertheimeria maculata Steindachner, 1877 and Hassar wilderi Kindle, 1895 (Siluriformes: Doradidae) and their relevance in doradids chromosomal evolution
TLDR
It is hypothesized that underlying conserved diploid and NOR-bearing chromosome numbers, chromosomal evolution in doradids has involved pericentric inversions and an increase of heterochromatic blocks.
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Chromosome differentiation patterns during cichlid fish evolution
TLDR
The karyotype diversification of cichlids seems to have occurred through several chromosomal rearrangements involving fissions, fusions and inversions, and the cytogenetic mapping of 18S ribosomal RNA (18S rRNA) gene did not follow the chromosome diversification in the family.
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A Novel ZZ/ZW Sex Chromosome System for the Genus Leporinus (Pisces, Anostomidae, Characiformes)
TLDR
The occurrence of sex chromosomes in Leporinus trifasciatus and Leporina sp2 from the Araguaia river, Amazon basin, Brazil, was investigated and it was found that the Z and W chromosomes of this species have originated independently from the ZW system previously described for other Leporine species.
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Heterochromatin and karyotype reorganization in fish of the family Anostomidae (Characiformes).
TLDR
Mitotic chromosomes of four fish species of the family Anostomidae, belonging to the genera Leporinus, Leporellus, and Schizodon, were studied, and this family appears to be characterized by marked karyotypic stability.
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Recent chromosome diversification in the evolutionary radiation of the freshwater fish family Curimatidae (Characiformes)
TLDR
Karyotypic variability corroborates the hypothesis that these fishes in Amazon region show various discrete patterns of species endemism and reveals a pronounced chromosome diversification in this group.
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Genetic diversity of Arapaima gigas (Schinz, 1822) (Osteoglossiformes: Arapaimidae) in the Araguaia-Tocantins basin estimated by ISSR marker
TLDR
These are the first data from a population analysis using molecular markers for A. gigas of Araguaia-Tocantins basins and may be used to define the best management strategies and conservation projects for this species.
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