| Counterintuitive carbon-to-nutrient coupling in an Arctic pelagic ecosystem. | |
MedLine Citation:
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PMID: 18716617 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Predicting the ocean's role in the global carbon cycle requires an understanding of the stoichiometric coupling between carbon and growth-limiting elements in biogeochemical processes. A recent addition to such knowledge is that the carbon/nitrogen ratio of inorganic consumption and release of dissolved organic matter may increase in a high-CO(2) world. This will, however, yield a negative feedback on atmospheric CO(2) only if the extra organic material escapes mineralization within the photic zone. Here we show, in the context of an Arctic pelagic ecosystem, how the fate and effects of added degradable organic carbon depend critically on the state of the microbial food web. When bacterial growth rate was limited by mineral nutrients, extra organic carbon accumulated in the system. When bacteria were limited by organic carbon, however, addition of labile dissolved organic carbon reduced phytoplankton biomass and activity and also the rate at which total organic carbon accumulated, explained as the result of stimulated bacterial competition for mineral nutrients. This counterintuitive 'more organic carbon gives less organic carbon' effect was particularly pronounced in diatom-dominated systems where the carbon/mineral nutrient ratio in phytoplankton production was high. Our results highlight how descriptions of present and future states of the oceanic carbon cycle require detailed understanding of the stoichiometric coupling between carbon and growth-limiting mineral nutrients in both autotrophic and heterotrophic processes. |
Authors:
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T F Thingstad; R G J Bellerby; G Bratbak; K Y Børsheim; J K Egge; M Heldal; A Larsen; C Neill; J Nejstgaard; S Norland; R-A Sandaa; E F Skjoldal; T Tanaka; R Thyrhaug; B Töpper |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-08-20 |
Journal Detail:
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Title: Nature Volume: 455 ISSN: 1476-4687 ISO Abbreviation: Nature Publication Date: 2008 Sep |
Date Detail:
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Created Date: 2008-09-18 Completed Date: 2008-10-21 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0410462 Medline TA: Nature Country: England |
Other Details:
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Languages: eng Pagination: 387-90 Citation Subset: IM |
Affiliation:
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Department of Biology, University of Bergen, Jahnebakken 5PO Box 7800, 5020 Bergen, Norway. frede.thingstad@bio.uib.no |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Arctic Regions Atmosphere / chemistry Autotrophic Processes / drug effects, radiation effects Bacteria / drug effects, growth & development, metabolism, radiation effects Biomass Carbon / metabolism* Carbon Dioxide / metabolism Diatoms / metabolism, radiation effects Ecosystem* Eutrophication Food Chain Glucose / metabolism, pharmacology Heterotrophic Processes / drug effects, radiation effects Phytoplankton / drug effects, growth & development, metabolism, radiation effects |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide; 50-99-7/Glucose; 7440-44-0/Carbon |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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