Complete mitochondrial genome of the yellowfin tuna ( Thunnus albacares ) and the blackfin tuna ( Thunnus atlanticus ):
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TECHNICAL NOTE
Complete mitochondrial genome of the yellowfin tuna (Thunnus albacares) and the blackfin tuna (Thunnus atlanticus): notes on mtDNA introgression and paraphyly on tunas N. J. Bayona‑Vásquez1,2 · T. C. Glenn2 · M. Uribe‑Alcocer1 · C. Pecoraro3 · P. Díaz‑Jaimes1
Received: 24 September 2017 / Accepted: 13 October 2017 © Springer Science+Business Media B.V. 2017
Abstract The genus Thunnus is composed of eight species, which are separated into two groups, the temperate subgenus Thunnus (bluefin tunas group) and the tropical subgenus Neothunnus (yellowfin tunas group). We obtained the mitochondrial genome for two species from the yellowfin group, Thunnus albacares and Thunnus atlanticus, and compared to those from extant Thunnus species to reconstruct the mtDNA phylogenetic relationship within the genus. Our results coincide with previous studies using mtDNA and nuclear loci in the paraphyly of the bluefin group mainly as a result of the position of Thunnus obesus within the tree. Also, we support the introgression hypothesis of the mtDNA from albacore into Pacific Bluefin tuna. Keywords Tunas · Mitochondrial genome · Thunnus · Neothunnus · Bluefin · Yellowfin The genus Thunnus, contains eight species whose monophyly is well supported (Collette et al. 2001). Six out of Electronic supplementary material The online version of this article (doi:10.1007/s12686-017-0904-0) contains supplementary material, which is available to authorized users. * N. J. Bayona‑Vásquez [email protected] 1
Laboratorio de Genética de Organismos Acuáticos, Instituto de Ciencias del Mar y Limnología, Ciudad Universitaria, Circuito exterior s/n, 04510 Mexico, Mexico
2
Department of Environmental Health Science, University of Georgia, Environmental Health Science Bldg., Athens, GA 30602, USA
3
Department of Biological, Geological and Environmental Sciences (BiGeA), University of Bologna, Alma Mater Studiorum, Ravenna, Italy
the eight species are greatly economic important in global markets, sustaining highly-industrialized fisheries worldwide and representing a highly-valued international trade commodity (Juan-Jordá 2013). Tunas are subdivided into the temperate subgenus Thunnus South 1845 (bluefin group) and the tropical subgenus Neothunnus Kishinouye 1923 (yellowfin group) (Collette 1978). The Neothunnus group includes blackfin tuna Thunnus atlanticus Lesson 1831 (BLF), long-tail tuna Thunnus tonggol Bleeker 1851 (LOT), and yellowfin tuna Thunnus albacares Bonaterre 1798 (YFT). The bluefin group comprises, the northern bluefin tuna subspecies T. thynnus thynnus L. 1758 (BFT) in the Atlantic and T. thynnus orientalis L. 1758 (PBF) in the Pacific, albacore Thunnus. alalunga Bonaterre 1778 (ALB), bigeye Thunnus obesus Lowe 1879 (BET), and southern bluefin tuna Thunnus maccoyii Castelnau 1872 (SBT). Here, we report the mtDNA from a YFT specimen from Senegal (Eastern Atlantic), and of two individuals of BLF from the Gulf of Mexico. Muscle samples were obtained from commercial fisheries. DNA was isolated using Wizard
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