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Genetic population structure and demographic history of a pelagic lumpsucker, Aptocyclus ventricosus


The population structure and demographic history of a pelagic lumpsucker, Aptocyclus ventricosus, were investigated on the basis of sequence variation in the mitochondrial cytochrome b gene (1038 bp). The haplotype network clearly recovered two haplotype groups, consisting of western and eastern North Pacific individuals, except for some specimens collected from offshore of Tohoku, northern Japan. The geographic distribution of haplotypes suggests that the ocean currents in the North Pacific have shaped the population structure of the species after historical vicariant events between the Kuril Islands and Kamchatka Peninsula. In addition, the demographic histories of the two haplotype groups were quite different, suggesting that the western North Pacific group experienced a population expansion starting around 10,000 years ago, while the population size of the eastern North Pacific group has remained more stable.

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We sincerely thank K. Fujiwara (Japan Sea National Fisheries Research Institute), the crews of T/V Tanshu-maru (Kasumi High School) and R/V Kaiyo-maru No. 5, O. Tsuruoka (Akkeshi Shoyo High School), and the Groundfish Assessment Program at the Alaska Fisheries Science Center for their help in the collection of specimens. We also greatly appreciate the curatorial assistance of F. Tashiro, R. Misawa (formerly FAKU) and K.P. Maslenikov (UW). This study was supported in part by JSPS KAKENHI (Grant Number: 19 K06808) and the Fisheries Agency of Japan under the projects of “Assessment of Fisheries Stocks in the Waters around Japan.”

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Correspondence to Yoshiaki Kai.

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Okazaki, T., Stevenson, D.E., Kai, Y. et al. Genetic population structure and demographic history of a pelagic lumpsucker, Aptocyclus ventricosus. Environ Biol Fish 103, 283–289 (2020). https://doi.org/10.1007/s10641-020-00955-y

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  • mtDNA
  • Cytochrome b
  • North Pacific Ocean
  • Genetic differentiation
  • Oyashio current
  • Tsushima current