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Original Article

Karyotype differentiation in Chromaphyosemion killifishes (Cyprinodontiformes, Nothobranchiidae). III: Extensive karyotypic variability associated with low mitochondrial haplotype differentiation in C. bivittatum

Völker M.a · Sonnenberg R.b · Ráb P.c · Kullmann H.a

Author affiliations

aInstitut für Evolutionsbiologie und Ökologie, Rheinische Friedrich-Wilhelms-Universität Bonn bZoologisches Forschungsmuseum Alexander Koenig, Bonn (Germany)

Related Articles for ""

Cytogenet Genome Res 116:116–126 (2007)

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Article / Publication Details

First-Page Preview
Abstract of Original Article

Published online: February 02, 2007
Issue release date: January 2007

Number of Print Pages: 11
Number of Figures: 5
Number of Tables: 2

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR

Abstract

We investigated chromosomal evolution in the African killifish species Chromaphyosemion bivittatum using a combination of cytogenetic and phylogenetic methods. Specimens from five populations were examined by conventional Giemsa staining as well as sequential chromosome banding with 4′,6-diamidino-2-phenylindole (DAPI), chromomycin A3 (CMA3), AgNO3-staining and C-banding. The cytogenetic analysis revealed variability in 2n ranging from 2n = 29 to 2n = 36 and in NF ranging from NF = 38 to NF = 44. Two populations showed an extensive chromosomal polymorphism (2n = 29–34, NF = 44 and 2n = 32–34, NF = 38–42, respectively). Karyotypic variability within and among populations was mainly due to Robertsonian translocations and heterochromatin additions, and chromosome banding patterns suggested that both types of chromosomal rearrangements were related to the presence of AT-rich heterochromatin. A phylogenetic analysis of the partial mitochondrial (mt) cytochrome b gene, using specimens from eleven populations, revealed a low degree of haplotype differentiation, which suggested a relatively recent divergence of the populations examined. This finding conformed to the low degree of morphological differentiation observed among C. bivittatum populations and might indicate fast chromosomal evolution. The high karyotypic variability may be caused by an elevated chromosomal mutation rate as well as certain aspects of the mating system and population dynamics of C. bivittatum facilitating the fixation of new chromosomal variants.

© 2007 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Article

Published online: February 02, 2007
Issue release date: January 2007

Number of Print Pages: 11
Number of Figures: 5
Number of Tables: 2

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR


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