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Journal Articles

Identification of coral spawn source areas around Sekisei Lagoon for recovery and poleward habitat migration by using a particle-tracking model

Takeda, Naoya*; Kashima, Motohiko*; Odani, Sachika*; Uchiyama, Yusuke*; Kamidaira, Yuki; Mitarai, Satoshi*

Scientific Reports (Internet), 11(1), p.6963_1 - 6963_10, 2021/03

 Times Cited Count:0 Percentile:0.01(Multidisciplinary Sciences)

A massive coral bleaching event occurred in 2016 in the interior of Japan's largest coral lagoon, the Sekisei Lagoon, located in the Kuroshio upstream region in southwestern Japan. Recovery of the coral lagoon will require the influx of coral spawn and larvae; therefore, it is important to identify and conserve source sites. A surface particle tracking simulation of coral spawn and larvae was used to identify source areas in the exterior Sekisei Lagoon for restoration of the interior lagoon. The northern coastal zone of Iriomote Island, including Hatoma Island, was identified as a major source area. Hatoma Island was also identified as a key source for the Kuroshio downstream region, making it one of the most important source areas in the Nansei Archipelago.

Journal Articles

Influences of the Kuroshio on interisland remote connectivity of corals across the Nansei Archipelago in the East China Sea

Uchiyama, Yusuke*; Odani, Sachika*; Kashima, Motohiko*; Kamidaira, Yuki; Mitarai, Satoshi*

Journal of Geophysical Research; Oceans (Internet), 123(12), p.9245 - 9265, 2018/12

 Times Cited Count:4 Percentile:37.33(Oceanography)

no abstracts in English

Journal Articles

A Biological network around Okinawa Island analyzed with a coupled high-resolution ocean circulation and lagrangian particle tracking model

Uchiyama, Yusuke*; Miyagawa, Tsubasa*; Odani, Sachika*; Kamidaira, Yuki; Odani, Sachika*

Doboku Gakkai Rombunshu, B2 (Kaigan Kogaku) (Internet), 74(2), p.I_1291 - I_1296, 2018/11

no abstracts in English

Journal Articles

Inventory analysis of suspended radiocesium derived from Niida River during a typhoon-induced flood event

Uchiyama, Yusuke*; Azuma, Kohei*; Odani, Sachika*; Iwasaki, Toshiki*; Tsumune, Daisuke*; Kamidaira, Yuki; Shimizu, Yasuyuki*; Onda, Yuichi*

Doboku Gakkai Rombunshu, B2 (Kaigan Kogaku) (Internet), 73(2), p.I_685 - I_690, 2017/10

no abstracts in English

Journal Articles

Influence of the Kuroshio on dispersal of coral spawn and larvae around Ryukyu Islands

Odani, Sachika*; Uchiyama, Yusuke*; Kashima, Motohiko*; Kamidaira, Yuki; Mitarai, Satoshi*

Doboku Gakkai Rombunshu, B2 (Kaigan Kogaku) (Internet), 73(2), p.I_1315 - I_1320, 2017/10

no abstracts in English

Journal Articles

Impact of mesoscale recirculation of the Kuroshio on asymmetric oceanic structure around Okinawa Island

Uchiyama, Yusuke*; Odani, Sachika*; Yamanishi, Takafumi*; Kamidaira, Yuki; Mitarai, Satoshi*

Doboku Gakkai Rombunshu, B2 (Kaigan Kogaku) (Internet), 72(2), p.I_481 - I_486, 2016/11

no abstracts in English

Oral presentation

Impact of the Kuroshio on dispersal of coral spawn and larvae around Ryukyu Islands in the East China Sea

Odani, Sachika*; Uchiyama, Yusuke*; Kashima, Motohiko*; Kamidaira, Yuki; Mitarai, Satoshi*

no journal, , 

We conduct a double nested high-resolution synoptic ocean modeling using ROMS with grid spacing down to 1 km coupled with an offline Lagrangian particle tracking model. The modeled dispersal of coral spawn and larvae released from about 20 major islands and lagoons are examined to quantify connectivity using Lagrangian probability density functions (PDFs) of the Lagrangian particles among Ryukyu Islands. We introduce 145 patches with a diameter of 1km around Sekisei Lagoon between Yaeyama and Ishigaki Islands close to Taiwan to compare with an in-situ surface drifter measurement. Lagragian particles are released from the patches in spring for 2012-2015 and are tracked for the advection time of 3 weeks suitable to representing active spawning and lifespan of coral spawn and larvae. The PDF analyses suggest that the particles mostly remain near the released areas, while about 10% of the particles are entrained by the Kuroshio to travel long distance, leading to inter-island connectivity. Some of these particles are further transported northeastward, and then partially trapped by the Kuroshio Counter Current formed between the Kuroshio and Main Island to approach Okinawa Main Island. We reveal that eastward current in the south the lagoon occurred shortly after the releases suppresses the entrainment and the resultant long-distance transport.

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