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ICES Journal of Marine Science: Journal du Conseil 2005 62(2):247-255; doi:10.1016/j.icesjms.2004.11.002
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© 2004 International Council for the Exploration of the Sea

Population genetic structure and history of the long-tailed hake, Macruronus magellanicus, in the SW Atlantic as revealed by mtDNA RFLP analysis

M.E. D'Amatoa,b,* and G.R. Carvalhoa

a University of Hull, Molecular Ecology and Fisheries Genetics Laboratory Hull HU6 7RX, UK
b Consejo Nacional de Investigaciones Científicas Argentina

*Correspondence to M. E. D'Amato: Present address: Stellenbosch University, Department of Genetics, Aquaculture Division, Stellenbosch, South Africa. tel: +27 21 808 5832; fax: +27 21 8085833. e-mail: damato{at}sun.ac.za.

The long-tailed hake, Macruronus magellanicus, is widely distributed in the SW Atlantic, and although it is commercially exploited, the extent of genetic structuring remains unclear. The hypothesis of a separate inshore stock as suggested by past biological data in northern Patagonia was tested with RFLP profiles of the mtDNA region ND5/6, in a total of 160 animals from eight locations. Sequence divergence between populations was nil, and all diversity is contained within populations. Despite the lack of geographic structuring in the distribution of haplotypes, the inference of population homogeneity should be taken cautiously owing to the skewed frequency distribution of haplotypes, with one allele accounting for 63% of individuals. A phylogenetic analysis of haplotypes reveals a star-shaped pattern with the presence of two lineages that may represent a population expansion. A rapid turnover of lineages, sweepstake recruitment, rapid expansion, or vulnerability to environmental conditions is not only suggested by the network pattern, but also by the departure from neutrality expectations. However, the role of selection cannot be ruled out until more loci or markers are examined.

Keywords: Macruronus magellanicus, mtDNA, population history, population structure

Received 28 January 2004; accepted 5 November 2004.


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