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Mutagenic effects of mercury pollution as revealed by micronucleus test on three Amazonian fish species.
TLDR
It is concluded that MNT in fish erythrocytes may be useful for indicating genotoxity of mercury in Amazon rivers. Expand
Chromosomal characterization of two species of genus Steatogenys (Gymnotiformes: Rhamphichthyoidea: Steatogenini) from the Amazon basin: sex chromosomes and correlations with Gymnotiformes phylogeny
TLDR
The observations suggest that the ZZ/ZW system observed in S. elegans likely evolved through CH addition followed by a paracentric inversion, consistent with the phylogenetic hypothesis that tribe Steatogenini should be positioned within family Ramphychthyidae. Expand
Karyotypes of 10 Species of Neotropical Cichlids (Pisces, Perciformes)
TLDR
The results obtained support the indications that the chromosomal evolution of the neotropical species of family Cichlidae was more conservative than divergent from the numerical point of view. Expand
Cytogenetic studies of two freshwater sciaenids of the genus Plagioscion (Perciformes, Sciaenidae) from the central Amazon
TLDR
Cytogenetic characterization of two freshwater sciaenid species from the genus Plagioscion was obtained for the first time and karyotypic formulae and NOR location proved to be valuable in showing both interspecific and intraspecific differences. Expand
Variability of 18S rDNA locus among Symphysodon fishes: chromosomal rearrangements.
TLDR
Three species of cichlids belonging to the genus Symphysodon have demonstrated interspecific and intraspecific variation in nucleolus organizer regions (NOR) detected with silver nitrate, which suggests that structural chromosome rearrangements effectively act in the karyoevolution of wild symphysodon species and may have favoured the adaptability of these fishes to diverse aquatic environments in the Amazon. Expand
Chromosomal evolution of neotropical cichlids: the role of repetitive DNA sequences in the organization and structure of karyotype
TLDR
The data demonstrated the karyotypic diversity that exists among neotropical cichlids, suggesting that most of this diversity is due to the repetitive sequences present in heterochromatic regions and that repeat sequences have greatly influenced the kARYotypic evolution of these fishes. Expand
B chromosomes in Amazonian cichlid species
TLDR
C-banding revealed that B chromosomes are totally heterochromatic, and two scenarios are suggested for the origin of these B chromosomes either by chromosomal breakdowns due to mutagenic action of methyl mercury present in the aquatic environment or by interspecific origin due to hybridization events. Expand
Karyological evidence for interspecific hybridization between Cichla monoculus and C. temensis (Perciformes, Cichlidae) in the Amazon.
TLDR
The great similarity in the chromosome number and morphology, chromosome size class differences, the NOR patterns and C-banding suggested chromosomal stasis during speciation and hybridization of Cichla. Expand
Comparative cytogenetics of cichlid fishes through genomic in-situ hybridization (GISH) with emphasis on Oreochromis niloticus
TLDR
This study compares the genome of O. niloticus with that of other cichlids from Africa and South America using genomic in-situ hybridization (GISH) and shows that at least some elements comprising the pericentromeric heterochromatin of Nile tilapia are species-specific. Expand
A checklist of chromosome numbers and karyotypes of Amazonian freshwater fishes
TLDR
A checklist of chromosome numbers of Amazonian freshlvater fishes is presented and 211 nominal species belonging to 5 orders have had their haploidldiploid number listed. Expand
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