Journal of the Graduate School of Biosphere Science, Hiroshima University Volume 52
2013-12-25 発行

Trophic status of 24 aquatic species in Hiroshima Bay inferred from stable isotope ratio

炭素窒素安定同位体比を用いた広島湾の海産生物24種の栄養段階の推定
Ahmad-Syazni, Kamarudin
Yamamoto, Masaki
Tahara, Naoki
Tomano, Satoshi
Ishihi, Yuka
Tokuda, Masaharu
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abstract
Stable isotopes can provide useful knowledge about sources and processes within an ecosystem. The stable isotopes of carbon (δ13C) and nitrogen (δ15N) were used to investigate trophic relationships of relatively commercially important 21 finfish species, cephalopods in Hiroshima Bay. Among 21 finfish species, the lowest mean δ15N of 14.4‰ was recorded for Engraulis japonicus and Hyporhamphus sajori while the highest mean δ15N of 16.8‰ was recorded for Sebasticus marmoratus. The lowest and highest mean δ13C were noted -17.6‰ for Chromis notata and H. sajori, and -15.3‰ for Pagrus major and Sillago japonica, respectively. Including with cephalopods, the highest mean δ13C and δ15N noted at -14.8‰ and 17.3‰ for Sepioteuthis lessoniana. Information of stable isotope variation and trophic level in aquatic species of Hiroshima Bay can be used for monitoring and managing sustainable fisheries.
subject
Finfish
Hiroshima Bay
stable isotope analysis
trophic level
安定同位体分析
栄養段階
魚類
広島湾