Artigo

Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae) from the Amazon basin

We present karyotypic characteristics and report on the occurrence of ZZ/ZW sex chromosomes in Ancistrus ranunculus (rio Xingu) and Ancistrus sp. "Piagaçu" (rio Purus), of the Brazilian Amazon. Ancistrus ranunculus has a modal number of 2n=48 chromosomes, a fundamental number (FN) of 82 for both sex...

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Autor principal: Oliveira, Renildo Ribeiro de
Outros Autores: Feldberg, Eliana, Anjos, Maeda Batista dos, Zuanon, Jansen
Grau: Artigo
Idioma: English
Publicado em: Neotropical Ichthyology 2020
Assuntos:
Ancistrus
Ancistrus Ranunculus
Loricariidae
Ranunculaceae
Siluriformes
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/14628
id oai:repositorio:1-14628
recordtype dspace
spelling oai:repositorio:1-14628 Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae) from the Amazon basin Oliveira, Renildo Ribeiro de Feldberg, Eliana Anjos, Maeda Batista dos Zuanon, Jansen Ancistrus Ancistrus Ranunculus Loricariidae Ranunculaceae Siluriformes We present karyotypic characteristics and report on the occurrence of ZZ/ZW sex chromosomes in Ancistrus ranunculus (rio Xingu) and Ancistrus sp. "Piagaçu" (rio Purus), of the Brazilian Amazon. Ancistrus ranunculus has a modal number of 2n=48 chromosomes, a fundamental number (FN) of 82 for both sexes, and the karyotypic formula was 20m+8sm+6st+14a for males and 19m+9sm+6st+14a for females. Ancistrus sp. "Piagaçu" presented 2n=52 chromosomes, FN=78 for males and FN=79 for females. The karyotypic formula was 16m+8sm+2st+26a for males and 16m+9sm+2st+25a for females. The high number of acrocentric chromosomes in karyotype of Ancistrus sp. "Piagaçu" differs from the majority of Ancistrini genera studied so far, and may have resulted from pericentric inversions and translocations. The lower number of chromosomes in A. ranunculus indicates that centric fusions also occurred in the evolution of Ancistrus karyotypes. We conclude that karyotypic characteristics and the presence of sex chromosomes can constitute important cytotaxonomic markers to identify cryptic species of Ancistrus. However, sex chromosomes apparently arose independently within the genus and thus do not constitute a reliable character to analyze phylogenetic relations among Ancistrus species. Copyright © 2007 Sociedade Brasileira de Ictiologia. 2020-04-24T16:55:27Z 2020-04-24T16:55:27Z 2007 Artigo https://repositorio.inpa.gov.br/handle/1/14628 10.1590/S1679-62252007000300010 en Volume 5, Número 3, Pags. 301-306 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Neotropical Ichthyology
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Ancistrus
Ancistrus Ranunculus
Loricariidae
Ranunculaceae
Siluriformes
spellingShingle Ancistrus
Ancistrus Ranunculus
Loricariidae
Ranunculaceae
Siluriformes
Oliveira, Renildo Ribeiro de
Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae) from the Amazon basin
topic_facet Ancistrus
Ancistrus Ranunculus
Loricariidae
Ranunculaceae
Siluriformes
description We present karyotypic characteristics and report on the occurrence of ZZ/ZW sex chromosomes in Ancistrus ranunculus (rio Xingu) and Ancistrus sp. "Piagaçu" (rio Purus), of the Brazilian Amazon. Ancistrus ranunculus has a modal number of 2n=48 chromosomes, a fundamental number (FN) of 82 for both sexes, and the karyotypic formula was 20m+8sm+6st+14a for males and 19m+9sm+6st+14a for females. Ancistrus sp. "Piagaçu" presented 2n=52 chromosomes, FN=78 for males and FN=79 for females. The karyotypic formula was 16m+8sm+2st+26a for males and 16m+9sm+2st+25a for females. The high number of acrocentric chromosomes in karyotype of Ancistrus sp. "Piagaçu" differs from the majority of Ancistrini genera studied so far, and may have resulted from pericentric inversions and translocations. The lower number of chromosomes in A. ranunculus indicates that centric fusions also occurred in the evolution of Ancistrus karyotypes. We conclude that karyotypic characteristics and the presence of sex chromosomes can constitute important cytotaxonomic markers to identify cryptic species of Ancistrus. However, sex chromosomes apparently arose independently within the genus and thus do not constitute a reliable character to analyze phylogenetic relations among Ancistrus species. Copyright © 2007 Sociedade Brasileira de Ictiologia.
format Artigo
author Oliveira, Renildo Ribeiro de
author2 Feldberg, Eliana
Anjos, Maeda Batista dos
Zuanon, Jansen
author2Str Feldberg, Eliana
Anjos, Maeda Batista dos
Zuanon, Jansen
title Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae) from the Amazon basin
title_short Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae) from the Amazon basin
title_full Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae) from the Amazon basin
title_fullStr Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae) from the Amazon basin
title_full_unstemmed Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae) from the Amazon basin
title_sort karyotype characterization and zz/zw sex chromosome heteromorphism in two species of the catfish genus ancistrus kner, 1854 (siluriformes: loricariidae) from the amazon basin
publisher Neotropical Ichthyology
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/14628
_version_ 1787144878202814464
score 11.755432

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