title: Nucleolar organizer regions in Sittasomus griseicapillus and Lepidocolaptes angustirostris (Aves, Dendrocolaptidae): Evidence of a chromosome inversion.
abstract: Cytogenetic studies in birds are still scarce compared to other vertebrates. Woodcreepers (Dendrocolaptidae) are part of a highly specialized group within the Suboscines of the New World. They are forest birds exclusive to the Neotropical region and similar to woodpeckers, at a comparable evolutionary stage. This paper describes for the first time the karyotypes of the Olivaceous and the Narrow-billed Woodcreeper using conventional staining with Giemsa and silver nitrate staining of the nucleolar organizer regions (Ag-NORs). Metaphases were obtained by fibular bone marrow culture. The chromosome number of the Olivaceous Woodcreeper was 2n = 82 and of the Narrow-billed Woodcreeper, 2n = 82. Ag-NORs in the largest macrochromosome pair and evidence of a chromosome inversion are described herein for the first time for this group.
authors.affiliation: Universidade Federal do Tocantins, Ciências Biológicas, Instituto de Biologia e Saúde Pública, Laboratório de Genética, Porto Nacional, TO, Brazil.
authors.forename: Marcelo
authors.initials: M
authors.lastname: de Oliveira Barbosa
authors.forename: Rubens Rodrigues
authors.initials: RR
authors.lastname: da Silva
authors.forename: Vanessa Carolina
authors.initials: VC
authors.lastname: de Sena Correia
authors.forename: Luana Pereira
authors.initials: LP
authors.lastname: Dos Santos
authors.forename: Analía Del Valle
authors.initials: Adel V
authors.lastname: Garnero
authors.forename: Ricardo José
authors.initials: RJ
authors.lastname: Gunski
keywords: Ag-NOR; chromosomal inversion; cytogenetics; woodcreepers