Document Detail

Eutrophication and self-purification: counteractions forced by large-scale cycles and hydrodynamic processes.
MedLine Citation:
PMID:  11697249     Owner:  NLM     Status:  MEDLINE    
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.
J Kuparinen; L Tuominen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ambio     Volume:  30     ISSN:  0044-7447     ISO Abbreviation:  Ambio     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-11-07     Completed Date:  2002-02-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0364220     Medline TA:  Ambio     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  190-4     Citation Subset:  IM    
Department of Biological Oceanography, Finnish Institute of Marine Research, P.O. Box 33, FIN-00931 Helsinki, Finland.
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MeSH Terms
Baltic States
Environmental Monitoring
Nitrogen / metabolism
Phosphorus / metabolism
Population Dynamics
Water Movements
Reg. No./Substance:
7723-14-0/Phosphorus; 7727-37-9/Nitrogen

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