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The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria
Bibliography: pages 76-89.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Oceanography
2016
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| _version_ | 1867613222252576768 |
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| access_status_str | Open Access |
| author | Van Wijk, Kim |
| author2 | Probyn, Trevor |
| author_browse | Probyn, Trevor Van Wijk, Kim |
| author_facet | Probyn, Trevor Van Wijk, Kim |
| author_sort | Van Wijk, Kim |
| collection | Thesis |
| description | Bibliography: pages 76-89. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18342 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:42.829Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Oceanography |
| publisherStr | Department of Oceanography |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18342 The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria Van Wijk, Kim Probyn, Trevor Phytoplankton Bibliography: pages 76-89. This study examines the effects of enrichment with organic carbon and nitrogen on inorganic nitrogen partitioning between phyto- and bacterio- plankton. Strongly preferential uptake of ammonium over nitrate was observed by both the phytoplanktonic and bacterial fractions, with RPINH4 values typically between 1 and 5. The bacterial fraction ( <0.8μm) was found to be responsible for as much as 48-75% of community uptake of ammonium; while the netplanktonic fraction was observed to take up approximately 50% of intact community uptake of nitrate. The addition of amino acids appeared to mediate bacterial competition for ammonium, indicating their preference for DON as a nitrogen source and allowing increased ammonium uptake by the nanoplanktonic fraction. The effect of glucose enrichment was complicated by the presence of protozoans, which appeared to be indirectly responsible for decreased ammonium uptake due to depletion of this substrate in the presence of added glucose. The nanoplankton appeared to be responsible for the least nitrogen uptake with respect to biomass, indicating that they may have been subject to competition pressure from both the bacterial and netplanktonic fractions. 2016-03-28T14:44:41Z 2016-03-28T14:44:41Z 1991 Master Thesis Masters MSc http://hdl.handle.net/11427/18342 eng application/pdf Department of Oceanography Faculty of Science University of Cape Town |
| spellingShingle | Phytoplankton Van Wijk, Kim The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria |
| thesis_degree_str | Master's |
| title | The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria |
| title_full | The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria |
| title_fullStr | The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria |
| title_full_unstemmed | The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria |
| title_short | The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria |
| title_sort | effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria |
| topic | Phytoplankton |
| url | http://hdl.handle.net/11427/18342 |
| work_keys_str_mv | AT vanwijkkim theeffectoforganiccarbonandnitrogenadditionsoninorganicnitrogenuptakebyphytoplanktonandbacteria AT vanwijkkim effectoforganiccarbonandnitrogenadditionsoninorganicnitrogenuptakebyphytoplanktonandbacteria |