Analyses of Nuclear ldhA Gene and mtDNA Control Region Sequences of Atlantic Northern Bluefin Tuna Populations |
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Authors: | B Ely DS Stoner Alvarado JR Bremer JM Dean P Addis A Cau EJ Thelen WJ Jones DE Black L Smith K Scott I Naseri JM Quattro |
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Institution: | (1) Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, U.S.A., US;(2) Program in Marine Science, University of South Carolina, Columbia, SC 29208, U.S.A., US;(3) Department of Animal Biology and Ecology, University of Cagliari, Sardinia, Italy, IT |
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Abstract: | There has been considerable debate about whether the Atlantic northern bluefin tuna exist as a single panmictic unit. We have
addressed this issue by examining both mitochondrial DNA control region nucleotide sequences and nuclear gene ldhA allele
frequencies in replicate size or year class samples of northern bluefin tuna from the Mediterranean Sea and the northwestern
Atlantic Ocean. Pairwise comparisons of multiple year class samples from the 2 regions provided no evidence for population
subdivision. Similarly, analyses of molecular variance of both mitochondrial and ldhA data revealed no significant differences
among or between samples from the 2 regions. These results demonstrate the importance of analyzing multiple year classes and
large sample sizes to obtain accurate estimates when using allele frequencies to characterize a population. It is important
to note that the absence of genetic evidence for population substructure does not unilaterally constitute evidence of a single
panmictic population, as genetic differentiation can be prevented by large population sizes and by migration. |
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