Study of the karyotype of Oryzoborus maximiliani (Passeriformes - Aves) using young feather pulp cultures

Abstract

The investigation of the karyotype of Oryzoborus maximiliani in living birds utilizing young feather pulp culture is described. The species karyotype was established as 2n = 72 with unequivocal identification of the sexual chromosome pair. Evolutionary considerations are raised.<br>Foram estudados citogeneticamente vinte exemplares da espécie Oryzoborus maximiliani provenientes de criatórios do Estado do Rio de Janeiro. Foi aplicada a técnica de cultura de curta duração de polpa de penas jovens, permitindo a investigação nas aves vivas. O cariótipo da espécie foi estabelecido (2n = 72) com identificação do par sexual. Considerações evolutivas são abordadas

Karyotype and C-banding Pattern of the Domestic Geese <I>Anser anser</I> Populations (Aves: Anatidae) in Egypt

“…Furthermore, the Z chromosome was submetacentric in all populations. This agrees with the findings of GOLDSCHMIDT et al (2000), ANDRASZEK et al (2007) and WÓJCIK and SMALEC (2007, 2008. Conversely, the W chromosome was metacentric in all populations examined; this result is consistent with the data presented by GOLDSCHMIDT et al (2000), however, it contradicts SILVERSIDES et al (1988), APITZ et al (1995) and SMALEC (2007, 2008) who assigned it as submetacentric.…”

“…This agrees with the findings of GOLDSCHMIDT et al (2000), ANDRASZEK et al (2007) and WÓJCIK and SMALEC (2007, 2008. Conversely, the W chromosome was metacentric in all populations examined; this result is consistent with the data presented by GOLDSCHMIDT et al (2000), however, it contradicts SILVERSIDES et al (1988), APITZ et al (1995) and SMALEC (2007, 2008) who assigned it as submetacentric. This difference in chromosome nomenclature may be due to some intrachromosomal rearrangements such as addition or deletion of chromosomal segments caused by pericentric inversion (GRIFFIN et al 2007;SHIBUSAWA et al 2004;NANDA et al 2008).…”

Chromosomal variability in the wild ornamental species of Symphysodon (Perciformes: Cichlidae) from Amazon

“…They visually resemble a metaphase dot, in which it is not possible to identify the centromere nor assign a chromosome morphology (Tegelström & Ryttman, 1981). Microchromosomes can present constitutive heterochromatin and nucleolar organizer regions (Tegelström & Ryttman, 1981;Tegelström et al, 1983;De Lucca, 1983;Fillon et al, 1998;Goldschmidt et al, 2000). Considering these descriptions, in Symphysodon aequifasciatus and in S. haraldi the pairs 29 and 30 were considered microchromosomes, as they did not possess a distinctive morphology in all metaphasic plates.…”

Determination of somatic and sex chromosomes of three Egyptian birds species using cytogenetic analysis

“…The diploid chromosome number of order Passeriformes ranging from 58 to 90, the macrochromosomes ranges from 6 to 12 pairs. While micro-chromosomes ranges from 23 to 39 pairs (HASSAN, 2003a;GOLDSCHMIDT et al, 2000;ROSLIK and KRIUKOV, 2001;DERJUSHEVA et al, 2001;ARCHAWARANON and MEVATEE, 2002;ARCHAWARANON, 2004;RAFAEL et al, 2015a;RAFAEL et al, 2015b). ROSLIK and KRIUKOV (2001) reported that the diploid chromosome numbers of Corvus cornix, C. corone and C. macrorhynchos (Family: Corvidae) were 2n=80, 80 and 82 respectively.…”

“…The karyotype studies of bird species not yet analyzed can offer important information towards a better knowledge of mechanisms of evolution and phylogenetic connection with the group. Conventional staining of chromosomes allows for the identification of number, structure and sub-structure of the chromosome (GOLDSCHMIDT, et al, 2000). HAKAN et al (1983) reported that 65 % of all avian species investigated have diploid chromosome number ranging from 78 to 82 with 7 to 9 pairs of macro-chromosomes and 30 to 34 pairs of micro-chromosomes and karyotype can be divided into four groups characterized by number of macro and micro-chromosomes.…”