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Title
Japanese:Integrated Population Genomic Analysis and Numerical Simulation to Estimate Larval Dispersal of Acanthaster cf. solaris Between Ogasawara and Other Japanese Regions 
English:Integrated Population Genomic Analysis and Numerical Simulation to Estimate Larval Dispersal of Acanthaster cf. solaris Between Ogasawara and Other Japanese Regions 
Author
Japanese: Mizuki Horoiwa, 中村隆志, 湯淺英知, 梶谷嶺, Yosuke Ameda, Tetsuro Sasaki, Hiroki Taninaka, Taisei Kikuchi, 山北剛久, 豊田敦, 伊藤武彦, 安田仁奈.  
English: Mizuki Horoiwa, Takashi Nakamura, Hideaki Yuasa, Rei Kajitani, Yosuke Ameda, Tetsuro Sasaki, Hiroki Taninaka, Taisei Kikuchi, Takehisa Yamakita, Toyoda Atsushi, Takehiko Itoh, Nina Yasuda.  
Language English 
Journal/Book name
Japanese:Frontiers in Marine Science 
English:Frontiers in Marine Science 
Volume, Number, Page Vol. 8       
Published date Jan. 17, 2022 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://dx.doi.org/10.3389/fmars.2021.688139
 
DOI https://doi.org/10.3389/fmars.2021.688139
Abstract <jats:p>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, <jats:italic>Acanthaster</jats:italic> cf. <jats:italic>solaris</jats:italic>, 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 <jats:italic>A.</jats:italic> cf. <jats:italic>solaris</jats:italic> 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.</jats:p>

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