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DNA barcodes of fish of the Scotia Sea, Antarctica indicate priority groups for taxonomic and systematics focus

Published online by Cambridge University Press:  19 May 2008

J. Rock ,
F.O. Costa ,
D.I. Walker ,
A.W. North ,
W.F. Hutchinson  and
G.R. Carvalho
J. Rock*
Affiliation:
Molecular Ecology & Fisheries Genetics Laboratory, School of Biological Sciences, University of Wales, Bangor LL57 2UW, UK
F.O. Costa
Affiliation:
Molecular Ecology & Fisheries Genetics Laboratory, School of Biological Sciences, University of Wales, Bangor LL57 2UW, UK
D.I. Walker
Affiliation:
Molecular Ecology & Fisheries Genetics Laboratory, School of Biological Sciences, University of Wales, Bangor LL57 2UW, UK
A.W. North
Affiliation:
Molecular Ecology & Fisheries Genetics Laboratory, School of Biological Sciences, University of Wales, Bangor LL57 2UW, UK
W.F. Hutchinson
Affiliation:
Department of Biological Sciences, University of Hull, Hull HU6 7RX, UK
G.R. Carvalho
Affiliation:
Molecular Ecology & Fisheries Genetics Laboratory, School of Biological Sciences, University of Wales, Bangor LL57 2UW, UK
*
*j.rock@bangor.ac.uk
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Abstract

We analysed cytochrome oxidase I (COI) barcodes for 35 putative fish species collected in the Scotia Sea, and compared the resultant molecular data with field-based morphological identifications, and additional sequence data obtained from GenBank and the Barcode of Life Data System (BOLD). There was high congruence between morphological and molecular classification, and COI provided effective species-level discrimination for nearly all putative species. No effect of geographic sampling was observed for COI sequence variation. For two families, including the Liparidae and Zoarcidae, for which morphological field identification was unable to resolve taxonomy, DNA barcoding revealed significant species-level divergence. However, the dataset lacked sufficient sensitivity for resolving species within the Bathydraco and Artedidraco genera. Analysis of cytochrome b for these two genera also failed to resolve taxonomic identity. The data are discussed in relation to emergent priorities for additional taxonomic studies. We emphasize the utility of DNA barcoding in providing a valuable taxonomic framework for fundamental population studies through assigning life history stages or other morphologically ambiguous samples to parental species.

Keywords

COIcyt bLiparidaeMyctophidaeNotothenioideiZoarcidae
Type
Research Article
Information
Antarctic Science , Volume 20 , Issue 3: BIOPEARL Cruise in the Scotia Sea , June 2008 , pp. 253 - 262
Copyright
Copyright © Antarctic Science Ltd 2008

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