Document Detail

Replacing the Nile: are anthropogenic nutrients providing the fertility once brought to the Mediterranean by a great river?
MedLine Citation:
PMID:  12691489     Owner:  NLM     Status:  MEDLINE    
Prior to construction of the Aswan High Dam, the annual Nile flood delivered about 7-11 x 10(3) t of biologically available phosphorus (P), at least 7 x 10(3) t of inorganic nitrogen (N), and 110 x 10(3) t of silica (Si) to the Mediterranean coastal waters off Egypt. These nutrients stimulated a dramatic "Nile bloom" of diatoms which supported a productive fishery. After closure of the dam in 1965, flow from the Nile was reduced by over 90%, and the fishery collapsed. It remained unproductive for about 15 years. The fishery began a dramatic recovery during the 1980s, coincident with increasing fertilizer use, expanded agricultural drainage, increasing human population, and dramatic extensions of urban water supplies and sewage collection systems. Calculations of the potential anthropogenic contribution of nutrients (P and N, but not Si) are consistent with the hypothesis that human sewage and agricultural drainage now support the fertility once provided by the Nile, though the nature of the productive ecosystem now supporting the fishery appears to be quite different from the historical one.
Scott W Nixon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ambio     Volume:  32     ISSN:  0044-7447     ISO Abbreviation:  Ambio     Publication Date:  2003 Feb 
Date Detail:
Created Date:  2003-04-14     Completed Date:  2003-06-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0364220     Medline TA:  Ambio     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  30-9     Citation Subset:  IM    
Graduate School of Oceanography, University of Rhode Island, Narragansett 02882-1197, USA.
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MeSH Terms
Conservation of Natural Resources*
Silicon Dioxide
Water Pollutants
Water Supply*
Reg. No./Substance:
0/Fertilizers; 0/Water Pollutants; 7631-86-9/Silicon Dioxide; 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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