著者

脇本 総志 國島 大河

出版者

国立大学法人 鹿児島大学総合研究博物館

雑誌

Ichthy, Natural History of Fishes of Japan (ISSN:24357715)

巻号頁・発行日

vol.4, pp.22-25, 2020 (Released:2021-01-20)

著者

中阪 航平 柄澤 秀親 國島 大 新井 和吉

出版者

学校法人 法政大学情報メディア教育研究センター

雑誌

法政大学情報メディア教育研究センター研究報告 (ISSN:18827594)

巻号頁・発行日

vol.36, pp.54-57, 2021-07-08 (Released:2021-07-22)

参考文献数

6

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In this study, in order to investigate the material physical properties that affect the delamination of CFRP, impact analysis was performed by changing four types of physical properties. The tensile strength, interlayer shear strength, and Mode I interlayer fracture toughness and Mode II interlayer fracture toughness were used as four kinds of material physical properties.

著者

國島 大河 立原 一憲

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.66, no.2, pp.161-170, 2019

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<p>The species of <i>Mugilogobius</i> sp. (Japanese name: Izumi-haze) and <i>M. chulae</i> are both common species, sympatrically inhabiting the estuaries and tidal flats of Okinawajima Island. Some species of <i>Mugilogobius</i> has a urea cycle, and their processing ability is higher, especially in northern distributed species, such as <i>M. abei</i> and <i>Mugilogobius</i> sp. It is possible to differentiate their life history traits and habitats on the basis of urea processing ability. However, because little is known in detail of their life history and habitat, <i>Mugilogobius</i> sp. and <i>M. chulae</i> were investigated through monthly sampling conducted on the southern part of the Sashiki Tidal flat and Manko Wetland on Okinawa-jima Island, from January 2012 to January 2013. The spawning seasons of <i>Mugilogobius</i> sp. and <i>M. chulae</i> are from January to October and April to October, respectively, with peaks in the summer period (April to October), indicating that maturity in both species is closely related to changes in water temperature. A comparison with the spawning season of <i>M. abei</i>, a temperate region species, revealed the subtropical species to spawn over a longer period. Estimates of daily age from otolith analyses indicated the possibility of recruitment from other areas, since histological observations revealed mismatches of gonads and birthmonths between different spawning seasons, as estimated by back-calculations of daily age. The longevity of <i>Mugilogobius</i> species was about six months. The study also revealed the growth rate of <i>Mugilogobius</i> sp. to be similar to that of <i>M. chulae</i>. <i>Mugilogobius chulae</i> locally inhabited mangrove habitats, whereas <i>Mugilogobius</i> sp. showed wide habitat use and was less susceptible to decreasing habitat than the former. Accordingly, future conservation of <i>M. chulae</i> is dependent upon suitable mud habitat associated with mangroves.</p>

著者

國島 大河 立原 一憲

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

2019

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<p>The species of <i>Mugilogobius</i> sp. (Japanese name: Izumi-haze) and <i>M. chulae</i> are both common species, sympatrically inhabiting the estuaries and tidal flats of Okinawajima Island. Some species of <i>Mugilogobius</i> has a urea cycle, and their processing ability is higher, especially in northern distributed species, such as <i>M. abei</i> and <i>Mugilogobius</i> sp. It is possible to differentiate their life history traits and habitats on the basis of urea processing ability. However, because little is known in detail of their life history and habitat, <i>Mugilogobius</i> sp. and <i>M. chulae</i> were investigated through monthly sampling conducted on the southern part of the Sashiki Tidal flat and Manko Wetland on Okinawa-jima Island, from January 2012 to January 2013. The spawning seasons of <i>Mugilogobius</i> sp. and <i>M. chulae</i> are from January to October and April to October, respectively, with peaks in the summer period (April to October), indicating that maturity in both species is closely related to changes in water temperature. A comparison with the spawning season of <i>M. abei</i>, a temperate region species, revealed the subtropical species to spawn over a longer period. Estimates of daily age from otolith analyses indicated the possibility of recruitment from other areas, since histological observations revealed mismatches of gonads and birthmonths between different spawning seasons, as estimated by back-calculations of daily age. The longevity of <i>Mugilogobius</i> species was about six months. The study also revealed the growth rate of <i>Mugilogobius</i> sp. to be similar to that of <i>M. chulae</i>. <i>Mugilogobius chulae</i> locally inhabited mangrove habitats, whereas <i>Mugilogobius</i> sp. showed wide habitat use and was less susceptible to decreasing habitat than the former. Accordingly, future conservation of <i>M. chulae</i> is dependent upon suitable mud habitat associated with mangroves.</p>