Cytogenetic analysis of five Hypostomus species (Siluriformes, Loricariidae)
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Data
2011-01-01
Autores
Martinez, Emanuel Ricardo Monteiro [UNESP]
Zawadzki, Claudio Henrique
Foresti, Fausto [UNESP]
Oliveira, Claudio [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Genética
Resumo
In this work, we analyzed the karyotypes of five species. Hypostomus cf. heraldoi, from the Mogi-Guaçu River, had 2n = 72 chromosomes, with a nucleolar organizer region (NOR) in one chromosomal pair. Hypostomus regani, from the Mogi-Guaçu River had 2n = 72 chromosomes with NORs in two chromosomal pairs. Hypostomus sp., from the Mogi-Guaçu River basin, had 2n = 68 chromosomes, with NORs in two chromosomal pairs. Hypostomus aff. agna, from Cavalo Stream, had 2n = 74 chromosomes with NORs in two chromosomal pairs. Hypostomus cf. topavae, from Carrapato Stream, had 2n = 80 chromosomes, with NORs in two chromosomal pairs. Hypostomus species showed marked diversity in the karyotypic formula, which suggested the occurrence of several Robertsonian rearrangements and pericentric inversions during the evolutionary history of this genus. This hypothesis was supported by the occurrence of a large number of uniarmed chromosomes and multiple NORs in a terminal position in most species and may be a derived condition in the Loricariidae.
Descrição
Palavras-chave
chromosomes, evolution, Hypostominae, Neotropical fish, NOR
Como citar
Genetics and Molecular Biology. Sociedade Brasileira de Genética, v. 34, n. 4, p. 562-568, 2011.