NDLI: Karyotypes of basal lineages in notothenioid fishes: the genus Bovichtus

Content Provider	Springer Nature Link
Author	Mazzei, Federico Ghigliotti, Laura Lecointre, Guillaume Ozouf Costaz, Catherine Coutanceau, Jean Pierre Detrich, William Pisa, Eva
Copyright Year	2006
Abstract	Using comparative cytogenetic techniques, we characterized the chromosomes of fishes from the family Bovichtidae, the basal lineage of the largely Antarctic suborder Notothenioidei. We focused on three Sub-Antarctic species of the genus Bovichtus that differ greatly in their circumpolar distributions: B. diacanthus (Tristan da Cunha Island Group), B. variegatus (New Zealand) and B. angustifrons (Tasmania). Chromosomes were analyzed both by conventional karyotyping and by cytogenetic mapping of ribosomal genes using fluorescence in situ hybridization. The three species displayed a strongly conserved karyotype consisting entirely of telocentric chromosomes (diploid number = 48; Fundamental Number = 48), in agreement with our previously published hypothesis that the bovichtid karyotype is the basal state for notothenioid fishes. The chromosomal distribution of ribosomal genes differed from those of most notothenioid species studied to date, with the 45S and 5S genes separated on two different chromosome pairs. Separation of two classes of ribosomal genes is the most widespread condition in teleosts, including the bovichtids. Most notothenioid lineages on the other hand exhibit a derived consolidation of these genes.
Starting Page	1071
Ending Page	1076
Page Count	6
File Format	PDF
ISSN	07224060
Journal	Polar Biology
Volume Number	29
Issue Number	12
e-ISSN	14322056
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zoology Plant Sciences Microbiology Oceanography Ecology
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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