Document Detail

A meta-analysis on the ecological effects of aquaculture on the water column: dissolved nutrients.
MedLine Citation:
PMID:  17166578     Owner:  NLM     Status:  MEDLINE    
Environmental effects of aquaculture loadings have often been reviewed descriptively, and thus have not provided quantitative estimates of the overall response in the water column. Meta-analytical reviewing techniques allow the contextualisation of quantitative effects in the domain of current literature. In the present paper, more than 50 peer-reviewed articles were analysed and about 425 study cases used to test whether worldwide cultivations have a differential effect on dissolved nutrient levels. Meta-analysis feasibility depends on obtaining an estimate of the effect size from every study and the most common measure of effect size (Hedges' d) is the difference between means of controls and impacts standardised by dividing by the pooled standard deviation. Across all study cases, irrespective of cultivation and organism type, the cumulative effect size was large and significant (d>0.8) for ammonium, nitrite and nitrate, medium (0.8>d>0.5) for dissolved phosphorus, and not significant (d<0.2) for silicates. Effects were mainly correlated with the degree of openness in water bodies, and ammonium and the other nitrogen forms were the most highly informative descriptors of effects in the area surrounding farms, even though weakness in statistical approach was highlighted. The results partially contradict the common view that effects of aquaculture and associated environmental patterns are well defined throughout the current literature.
G Sarà
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Publication Detail:
Type:  Journal Article; Meta-Analysis     Date:  2006-11-07
Journal Detail:
Title:  Marine environmental research     Volume:  63     ISSN:  0141-1136     ISO Abbreviation:  Mar. Environ. Res.     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-02-27     Completed Date:  2007-07-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882895     Medline TA:  Mar Environ Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  390-408     Citation Subset:  IM    
Dipartimento di Biologia Animale dell'Università, Via Archirafi 18, Palermo 90123, Italy.
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MeSH Terms
Environmental Monitoring / statistics & numerical data*
Fresh Water / chemistry*
Nitrates / analysis
Nitrites / analysis
Phosphorus / analysis
Quaternary Ammonium Compounds / analysis
Seawater / chemistry*
Silicates / analysis
Reg. No./Substance:
0/Nitrates; 0/Nitrites; 0/Quaternary Ammonium Compounds; 0/Silicates; 7723-14-0/Phosphorus

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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