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Some characteristic features of large amorphous particles (NUTA) in the seto Inland Sea, Japan

Journal of the Oceanographical Society of Japan, ISSN: 0029-8131, Vol: 47, Issue: 6, Page: 276-285
1991
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Large amorphous aggregates (NUTA) observed in coastal areas after spring and autumn phytoplankton blooms and red tide outbreaks were collected using NUTA traps which we devised. These particles become thickly attached to mooring ropes and/or fishing nets. The variation of the collection of materials by NUTA traps was about 23% in organic carbon and 25% in organic nitrogen (n=29). The chemical nature and vertical distribution pattern of NUTA were significantly different from those of suspended particles collected by water samplers. Since C/ATP and C/Chl α ratios in NUTA were very high compared with those of suspended particles, NUTA seems to consist of a small amount of phytoplankton but much detritus. These values suggest that NUTA has characteristics intermediate between suspended particles and sinking particles. The standing stock of NUTA was also estimated to be no more than 10% suspended particles from a calculation of the trapping efficiency of the NUTA trap. © 1991 the Oceanographic Society of Japan.

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