Journal of Molecular Evolution

, Volume 41, Issue 6, pp 741–748

Phylogenetic relationships between tuna species of the genus Thunnus (Scombridae: Teleostei): Inconsistent implications from morphology, nuclear and mitochondrial genomes

Authors

  • Seinen Chow
    • National Research Institute of Far Seas Fisheries
  • Hirohisa Kishino
    • Department of Social and International RelationsUniversity of Tokyo
Articles

DOI: 10.1007/BF00173154

Cite this article as:
Chow, S. & Kishino, H. J Mol Evol (1995) 41: 741. doi:10.1007/BF00173154

Abstract

In order to infer phylogenetic relationships between tuna species of the genus Thunnus, partial sequences of the mitochondrial cytochrome b and ATPase genes were determined in all eight species. Supplemental restriction analysis on the nuclear rRNA gene was also carried out. Pacific northern bluefin tuna (Thunnus thynnus orientalis) was found to have mtDNA distinct from that of the Atlantic subspecies (T. t. thynnus) but very similar to that from the species albacore (T. alaluga). In contrast, no differentiation in nuclear genome was observed between the Atlantic and Pacific northern bluefin tunas. The Atlantic northern bluefin and southern bluefin tunas possessed mtDNA sequences very similar to species of yellowfin tuna group and not so similar to albacore and bigeye tunas which were morphologically assigned to the bluefin tuna group. The molecular data indicate that (1) mtDNA from albacore has been incorporated into the Pacific population of northern bluefin tuna and has extensively displaced the original mtDNA, and (2) albacore is the earliest offshoot, followed by bigeye tuna in this genus, which is inconsistent with the phylogenetic relationships between these tuna species inferred from morphology.

Key words

TunaMitochondrial DNA transferPhylogenetic analysis

Copyright information

© Springer-Verlag New York Inc 1995