| Eutrophication and self-purification: counteractions forced by large-scale cycles and hydrodynamic processes. | |
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MedLine Citation:
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PMID: 11697249 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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During the 1990s nitrogen reserves have shown rising trends in the northern Baltic Sea. Changes in denitrification explain some of the fluctuations observed in nitrogen reserves. Although denitrification is an anaerobic process, the most efficient removal of nitrogen by denitrification occurs where the sediment is moderately well oxidized. A dramatic decrease in the ratio of SiO4 to DIN (DIN = NO3 + NH4) in the northern Baltic proper during the period 1973-1999 was recorded. If dissolved silica limits phytoplankton spring bloom, diatom blooms fade and become replaced by flagellates leading to changes in summer phosphate reserves and sedimentation. Seven years have elapsed from the previous strong saltwater inflow and anoxia has spread over large areas. Deep bottom phosphorus levels have started to increase and denitrification capacity is weakening. Thus, all efforts to minimize N- and P-loading will, in the long run, help the Baltic Sea to recover from the unacceptable status of eutrophication. |
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Authors:
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J Kuparinen; L Tuominen |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Ambio Volume: 30 ISSN: 0044-7447 ISO Abbreviation: Ambio Publication Date: 2001 Aug |
Date Detail:
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Created Date: 2001-11-07 Completed Date: 2002-02-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0364220 Medline TA: Ambio Country: Sweden |
Other Details:
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Languages: eng Pagination: 190-4 Citation Subset: IM |
Affiliation:
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Department of Biological Oceanography, Finnish Institute of Marine Research, P.O. Box 33, FIN-00931 Helsinki, Finland. jorma.kuparinen@fimr.fi |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Baltic States Environmental Monitoring Eutrophication* Nitrogen / metabolism Phosphorus / metabolism Phytoplankton* Population Dynamics Seasons Water Movements |
| Chemical | |
Reg. No./Substance:
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7723-14-0/Phosphorus; 7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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