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oai:ir.kagoshima-u.ac.jp:00003327 2026-03-03T08:32:49Z 228:229:5058 37:53

Nutrients in Koshikijima deep seawater ICHIKAWA, Toshihiro TOMIOKA, Miyuki MAKINOSE, Kana HOTOKEBUCHI, Yuichi open access deep seawater nutrients Koshikijima Nutrient concentrations in Koshikijima deep seawater pumped from a depth of 375m were examined from July 2003 to June 2004. Nutrients were variable and showed marked increases and decreases in a short period. However, average monthly concentrations of nitrate, phosphate, and silicate showed that there is some parallelism in the variation of nutrients. Mean N/P ratio (15) in the present study was close to the Redfield ratio of 16 observed in the open water. As sample water was taken significantly deeper than euphotic layer in the East China Sea, no chlorophyll was detected throughout the year. Dissolved organic nitrogen (DON) was at the level of oceanic surface water. It was concluded that Koshikijima deep seawater has the properties of open water in that it is less influenced by artificial factors. 鹿児島大学 Kagoshima University 2004-12-30 eng departmental bulletin paper VoR http://hdl.handle.net/10232/812 https://ir.kagoshima-u.ac.jp/records/3327 13456938 AA11246904 鹿児島大学理学部紀要 Reports of the Faculty of Science, Kagoshima University 37 77 82 https://ir.kagoshima-u.ac.jp/record/3327/files/KJ00004261838.pdf application/pdf 363.2 kB 2016-10-27 2004-12-30