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Cytogenetic diversity in the Antarctic plunderfishes (Notothenioidei: Artedidraconidae)

Published online by Cambridge University Press:  02 December 2010

Laura Ghigliotti ,
Thomas J. Near ,
Sara Ferrando ,
Marino Vacchi  and
Eva Pisano
Laura Ghigliotti*
Affiliation:
Department of Biology, University of Genoa, Viale Benedetto XV 5, 16132 Genoa, Italy
Thomas J. Near
Affiliation:
Department of Ecology and Evolutionary Biology and Peabody Museum of Natural History, Yale University, New Haven, CT 06520-8105, USA
Sara Ferrando
Affiliation:
Department of Biology, University of Genoa, Viale Benedetto XV 5, 16132 Genoa, Italy
Marino Vacchi
Affiliation:
ISPRA and National Antarctic Museum, University of Genova, Viale Benedetto XV 5, 16132 Genoa, Italy
Eva Pisano
Affiliation:
Department of Biology, University of Genoa, Viale Benedetto XV 5, 16132 Genoa, Italy
*
[email protected]
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Abstract

Antarctic plunderfishes (Notothenioidei, Artedidraconidae) are important components of the Southern Ocean fish fauna. As a contribution to the Victoria Land Transect Project, we performed a cytogenetic analysis of six species from three of the four artedidraconid genera, Artedidraco glareobarbatus, A. orianae, A. skottsbergi, A. shackletoni, Histiodraco velifer, and Pogonophryne sp. We investigated the species-specific cytogenetic features and highlighted patterns of chromosomal evolutionary change using a molecular phylogeny based on mitochondrial and nuclear genes. Despite a conserved diploid number, some important karyotypic traits account for major differences among artedidraconid species. Specific cytogenetic features, including the chromosomal organization of ribosomal genes and the occurrence of sex chromosomes, are characteristics of A. skottsbergi, making this species distinct among those studied. These chromosomal peculiarities are consistent with the phylogenetic hypothesis resolving A. skottsbergi as the sister lineage of all other Artedidraconidae. A karyological similarity was found between A. glareobarbatus and A. shackletoni consistent with their inferred sister species relationship in the phylogeny. The results indicate that artedidraconids are not conservative in their genomic organization at the chromosomal level and provide new evidence for the degree of biological diversity in this notothenioid group.

Keywords

chromosomescytogenetic mappingVictoria Land Transect
Type
Research Article
Information
Antarctic Science , Volume 22 , Special Issue 6: The Latitudinal Gradient Project (LGP) , December 2010 , pp. 805 - 814
Copyright
Copyright © Antarctic Science Ltd 2010

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