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Release of dissolved organic nitrogen by size-fractionated natural planktonic assemblages in coastal waters
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hasegawa, Toru Koike Mukai, Hiroshi |
| Copyright Year | 2000 |
| Abstract | To evaluate the effect of differences in community structure on the process of dissolved organic nitrogen (DON) release in natural planktonic assemblages, DO 15 N release from size-fractionated (<20 and <94 μm) waters of Akkeshi Bay, eastern Hokkaido, Japan, was measured after the addition of 15 NH 4 + . Calculations of percent extracellular release (PER) based on particulate organic 15 N-nitrogen (PO 15 N) and DO 15 N accumulation were higher in the <20 μm fraction than in the <94 pm fractions in 2 out of 3 experiments; though the absolute magnitude of the release was higher in the larger size-fraction. Phytoplankton was primarily responsible for the DO 15 N release in the <20 pm fraction, which suggested more efficient DON release by smaller phytoplankton compared to larger ones. A passive permeation through the cell membrane is a likely explanation for the DON release observed in our study. PER (<94 μm) fell within the range of 2.7 to 4.9%, which is almost equal to, or somewhat lower than, the PER reported for carbon. In addition, the occurrence of tight coupling between DON release and its consumption by bacteria was suggested in a time-course experiment, showing efficient use of released nitrogenous compounds within the natural community. |
| Starting Page | 43 |
| Ending Page | 49 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.3354/meps198043 |
| Volume Number | 198 |
| Alternate Webpage(s) | https://www.int-res.com/articles/meps/198/m198p043.pdf |
| Alternate Webpage(s) | https://doi.org/10.3354/meps198043 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
