Integrated Population Genomic Analysis and Numerical Simulation to Estimate Larval Dispersal of Acanthaster cf. solaris Between Ogasawara and Other Japanese Regions

Frontiers in Marine Science

Nina Yasuda¹  Atsushi Toyoda²  Rei Kajitani³  Takehiko Itoh³  Hideaki Yuasa³  Taisei Kikuchi⁴  Mizuki Horoiwa⁶  Yosuke Ameda⁷  Tetsuro Sasaki⁷  Hiroki Taninaka⁸  Takehisa Yamakita⁹  Takashi Nakamura^1,10 

[1] 0Faculty of Agriculture, University of Miyazaki, Miyazaki, Japan;Department of Genomics and Evolutionary Biology, National Institute of Genetics, Shizuoka, Japan;Department of Life Science and Technology, School of Life Sciences and Technology, Tokyo Institute of Technology, Tokyo, Japan;Faculty of Medicine, University of Miyazaki, Miyazaki, Japan;Graduate School of Agriculture, University of Miyazaki, Miyazaki, Japan;Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Japan;Institute of Boninology, Ogasawara, Japan;Interdisciplinary Graduate School of Agriculture and Engineering, University of Miyazaki, Miyazaki, Japan;Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan;School of Environment and Society, Tokyo Institute of Technology, Tokyo, Japan;

关键词: crown-of-thorn starfish;    Kuroshio Current;    larval dispersal;    Ogasawara (Bonin) Islands;    population genetic analyses;    population genetics;   

DOI  :  10.3389/fmars.2021.688139

来源: DOAJ

【 摘 要 】

The estimation of larval dispersal on an ecological timescale is significant for conservation of marine species. In 2018, a semi-population outbreak of crown-of-thorns sea star, Acanthaster cf. solaris, was observed on a relatively isolated oceanic island, Ogasawara. The aim of this study was to assess whether this population outbreak was caused by large-scale larval recruitment (termed secondary outbreak) from the Kuroshio region. We estimated larval dispersal of the coral predator A. cf. solaris between the Kuroshio and Ogasawara regions using both population genomic analysis and simulation of oceanographic dispersal. Population genomic analysis revealed overall genetically homogenized patterns among Ogasawara and other Japanese populations, suggesting that the origin of the populations in the two regions is the same. In contrast, a simulation of 26-year oceanographic dispersal indicated that larvae are mostly self-seeded in Ogasawara populations and have difficulty reaching Ogasawara from the Kuroshio region within one generation. However, a connectivity matrix produced by the larval dispersal simulation assuming a Markov chain indicated gradual larval dispersal migration from the Kuroshio region to Ogasawara in a stepping-stone manner over multiple years. These results suggest that the 2018 outbreak was likely the result of self-seeding, including possible inbreeding (as evidenced by clonemate analysis), as large-scale larval dispersal from the Kurishio population to the Ogasawara population within one generation is unlikely. Instead, the population in Ogasawara is basically sustained by self-seedings, and the outbreak in 2018 was also most likely caused by successful self-seedings including possible inbreeding, as evidenced by clonemate analysis. This study also highlighted the importance of using both genomic and oceanographic methods to estimate larval dispersal, which provides significant insight into larval dispersal that occurs on ecological and evolutionary timescales.

【 授权许可】

Unknown