Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/6478
Title: Karyological evidence for interspecific hybridization between Cichla monoculus and C. temensis (Perciformes, Cichlidae) in the Amazon
Authors: Brinn, Marineide Neves Alves
Porto, Jorge Ivan Rebelo
Feldberg, Eliana
Keywords: Acrocentric chromosome
Bass
Brazil
C banding
Centromere
Chromosome analysis
Chromosome arm
Chromosome nor
Chromosome number
Chromosome pairing
Chromosome size
Chromosome structure
Constitutive heterochromatin
Controlled study
Diploidy
Fish genetics
Hybrid
Interspecific hybridization
Nonhuman
River
Species differentiation
Animals
Brazil
Chromosomes
Cichlids
Female
Heterochromatin
Hybridization
Genetic
Karyotyping
Male
Nucleolus organizer region
Bairdiella ronchus
Cichla monoculus
Cichla temensis
Cichlidae
Perciformes
Issue Date: 2004
metadata.dc.publisher.journal: Hereditas
metadata.dc.relation.ispartof: v. 141, n. 3
Abstract: Cichla monoculus, Cichla temensis (peacock bass or tucunaré), and its presumed hybrids, were cytogenetically analyzed. The fish were collected at three distinct sites in the central Amazon basin, namely in the Uatumã (C. monoculus, C. temensis and their natural hybrid), Jaú (C. temensis), and Solimões rivers (C. monoculus). The two species and the natural hybrid showed the same diploid number, 2n=48 acrocentric chromosomes. Single NORs were detected in the distal region of the long arm in all three species. However, in C. monoculus, the NOR was found on the second pair of the complement, in C. temensis, on the third pair and in the hybrid two NOR patterns were found, one on the second pair and the other on the third pair of chromosomes. The two species and the hybrid have their constitutive heterochromatin located in the pericentromeric region of all chromosomes and an interstitial C-band located on the largest chromosome pair. 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.
URI: https://repositorio.inpa.gov.br/handle/1/6478
metadata.dc.identifier.doi: 10.1111/j.1601-5223.2004.01830.x
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