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Keywords:

  • AMOVA;
  • cytochrome b;
  • haplotype network;
  • mitochondrial lineage;
  • phylogeography;
  • transoceanic barrier

Nucleotide variation of partial cytochrome b sequences was analysed in the bluefish Pomatomus saltatrix to investigate the population-structuring roles of climate change and oceanic barriers. Western and eastern North Atlantic Ocean populations appeared to be totally isolated, with the latter connected to the Mediterranean Sea within which further structuring occurred.