Nitrogen uptake rates in phytoplankton and ice algae in the Barents Sea
Uptake rates of NH4+, NO3? and dissolved organic nitrogen (urea) were measured in phytoplankton and in ice algae in the Barents Sea using a 15N-technique. NO3? was the most important nitrogen source for the ice algae (f-ratio = 0.92). The in situ irradiances in the subsurface chlorophyll maximum and...
| Published in: | Polar Research |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Norwegian Polar Institute
1991
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| Subjects: | |
| Online Access: | https://polarresearch.net/index.php/polar/article/view/2308 https://doi.org/10.3402/polar.v10i1.6737 |
| Summary: | Uptake rates of NH4+, NO3? and dissolved organic nitrogen (urea) were measured in phytoplankton and in ice algae in the Barents Sea using a 15N-technique. NO3? was the most important nitrogen source for the ice algae (f-ratio = 0.92). The in situ irradiances in the subsurface chlorophyll maximum and in the ice algal communities were low. The in situ NO3? uptake rate in the ice algal communities was light-limited The in situ NO3? and NH4? uptake rates in the subsurface chlorophyll maximum were at times light-limited. It is hypothesised that NH4+ may accumulate in low light in the bottom of the euphotic zone and inhibit the in situ NO3? uptake rate. |
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