Occurrence of sexual chromosome, of the type ZZ/ZW, in Ancistrus cf. dubius (Loricariidae, Ancistrinae) of the Paraguay River Basin, Mato Grosso, Brazil

@article{Sandra2004OccurrenceOS,
  title={Occurrence of sexual chromosome, of the type ZZ/ZW, in Ancistrus cf. dubius (Loricariidae, Ancistrinae) of the Paraguay River Basin, Mato Grosso, Brazil},
  author={M. Sandra and R. Artoni and Carlos Suetoshi Miyazawa},
  journal={Caryologia},
  year={2004},
  volume={57},
  pages={327 - 331}
}
Abstract Fifteen specimens of Ancistrus cf. dubius of the Paraguay River Basin (Serra das Araras /Barra dos Bugres, Mato Grosso state, Brazil) were studied cytogenetically with characterization and of constitutive heterochromatin and nucleolar organizer regions (NORs) evidenced by C-bands, flurochrome GC-rich DA/CMA3 and silverstaining. For the first time, chromosomic heteromosphism related to sex, of the type ZZ/ZW, was observed in Ancistrinae fish. Thus, in the karyotype of males a pair of Z… Expand
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Two mechanisms for the origin and evolution of this simple ZZ/ZW sex chromosome system in A. taunayi are proposed: (1) a paracentric inversion followed by amplification of the proximal heterochromatin and (2) amplifying of the interstitial heterochROMatin followed by aParacentic inversion. Expand
Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae) from the Amazon basin
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It is concluded that karyotypic characteristics and the presence of sex chromosomes can constitute important cytotaxonomic markers to identify cryptic species of Ancistrus, but sex chromosomes apparently arose independently within the genus and thus do not constitute a reliable character to analyze phylogenetic relations among AnCistrus species. Expand
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Four populations of Ancistrus cf. dubius (Loricariidae, Ancistrinae) were analyzed cytogenetically. They were from different rivers and creeks of the Pantanal Basin, in the state of Mato Grosso,Expand
Ancistrus cf. dubius (Siluriformes, Ancistrinae), a complex of species. 1. Chromosomic characterization of four populations and occurence of sexual chromosomes of type XX/XY, in the pantanal basin of Mato Grosso, Brazil
Abstract Four populations of Ancistrus cf. dubius (Loricariidae, Ancistrinae) were analyzed cytogenetically. They were from different rivers and creeks of the Pantanal Basin, in the state of MatoExpand
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The large karyotypic diversity among Ancistrus species may be related to biological and behavioural characteristics of these fish that include microhabitat preferences, territoriality and specialized reproductive tactics, which may lead to a fast rate of fixation of chromosomal mutations and eventually speciation across the Amazon basin. Expand
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The data showed in this work reveal particular chromosomal characteristics, important for a good recognition of both Hemincistrus species, and show the importance of the insertion of cytogenetic data on taxonomic phylogenetic studies. Expand
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The chromosomal polymorphism of C-positive heterochromati cbands were adjacent to the rDNA sites in the corresponding chromosomes. Expand
First description of the karyotype and Ag-NORs localization of Brachychalcinus retrospina (Pisces: Characidae: Stethaprioninae) from Upper Paraguay Basin, Mato Grosso State, Brazil
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The results for B. retrospina corroborate those found for other species this subfamily, both in chromosome number and markings of Ag-NORs, indicating some stability chromosomal for this group. Expand
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