Chromosomal polymorphism in a natural population of the northern green barbet, Megalaima zeylanica caniceps (Franklin) (Piciformes: Aves)

Kaul, D.; Ansari, H. A.

doi:10.1007/bf00135041

Cited by 6 publications

(4 citation statements)

References 16 publications

(11 reference statements)

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“…Reciprocal translocations can be identified using relative length and centromeric indices of the chromosomes [14], [16]. We measured and compared the chromosome arm lengths of hetero- and homomorphic chromosomes no.1 and no.6 which were chosen from the karyotypes of different individuals in several populations (Table 4), our results coincided with Wang's which were based on only one individual from a single population [14].…”

Section: Discussionsupporting

confidence: 57%

“…1 and a small terminal region of a microchromosome and a chromosome chain formed during meiosis. In a limited sample of 11 individuals, five normal individuals (2♂, 3♀), five translocation heterozygotes (3♂, 2♀) and one translocation homozygote (1♀) were found [16] . Obviously, these three karyomorphs resulted from the union of gametes produced by alternate segregation and this segregation type may dominant in this bird.…”

Section: Discussionmentioning

confidence: 94%

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A De Novo Case of Floating Chromosomal Polymorphisms by Translocation in Quasipaa boulengeri (Anura, Dicroglossidae)

Luo

Xia

et al. 2012

PLoS ONE

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Very few natural polymorphisms involving interchromosomal reciprocal translocations are known in amphibians even in vertebrates. In this study, thirty three populations, including 471 individuals of the spiny frog Quasipaa boulengeri, were karyotypically examined using Giemsa stain or FISH. Five different karyomorphs were observed. The observed heteromorphism was autosomal but not sex-related, as the same heteromorphic chromosomes were found both in males and females. Our results indicated that the variant karyotypes resulted from a mutual interchange occurring between chromosomes 1 and 6. The occurrence of a nearly whole-arm translocation between chromosome no. 1 and no. 6 gave rise to a high frequency of alternate segregation and probably resulted in the maintenance of the translocation polymorphisms in a few populations. The translocation polymorphism is explained by different frequencies of segregation modes of the translocation heterozygote during meiosis. Theoretically, nine karyomorphs should be investigated, however, four expected karyotypes were not found. The absent karyomorphs may result from recessive lethal mutations, position effects, duplications and deficiencies. The phylogenetic inference proved that all populations of Q. boulengeri grouped into a monophyletic clade. The mutual translocation likely evolved just once in this species and the dispersal of the one karyomorph (type IV) can explain the chromosomal variations among populations.

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Section: Discussionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 94%

A De Novo Case of Floating Chromosomal Polymorphisms by Translocation in Quasipaa boulengeri (Anura, Dicroglossidae)

Luo

Xia

et al. 2012

PLoS ONE

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“…Similar variation in sex chromosome size and morphology occurs in Picoides, Colaptes and Sphirapicus. Two species of the family Megalaimidae, Megalaima haemacephala (Shields et al, 1982) and M. zeylanica (Kaul and Ansari, 1981), have Z chromosomes which correspond to those seen in Ramphastidae. In contrast, the W chromosome is small and telocentric in M. haemacephala, and larger than the second pair of autosomes in M. zeylanica.…”

Section: Discussionmentioning

confidence: 93%

Karyotypic characterization of Ramphastidae (Piciformes, Aves)

2002

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The karyotypes of nine species of the family Ramphastidae were determined and compared with that of the toco toucan (Ramphastos toco), the only ramphastid karyotype so far reported in the literature. Differences in the morphology of the largest chromosomes allowed to identify three karyotype groups. The first group included the species R. toco, Baillonius bailloni, Pteroglossus castanotis, P. aracari and Selenidera maculirostris, in which only the first pair of chromosomes was metacentric. The second group included four Ramphastos species (R. dicolorus, R. ariel, R. vitellinus, R. tucanus cuvieri) with two pairs of metacentric macrochromosomes (the first and the seventh). The third group was represented by a single species, A. laminirostris, in which all the autosomal chromosomes were telocentric. All of the species had subtelocentric Z chromosomes, similar in size to homologues of the first pair. Sex chromosome W was a small chromosome. The chromosome number ranged from 2n = 62 in P. aracari to 114 in R. toco. The cytotaxonomic relationships among toucan species are discussed, based on chromosome analysis.

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“…This (Kaul & Ansari, 1981), owls (Strix) (Takagi & Sasaki, 1974), and cormorants (Phalacrocorax) (Ebied et al, 2005). Other karyotype data were obtained from the literature (Benirschke, 1977;Waldrigues & Ferrari, 1982;Christidis, 1990;Qingsong et al, 1995;Nishida et al, 2008).…”

Section: Expanding Karyotype and Sex Chromosomesmentioning

confidence: 99%