Document Detail


Intra- and inter-specific variability in total and methylmercury bioaccumulation by eight marine fish species from the Azores.
MedLine Citation:
PMID:  17727898     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We relate fish biological and ecological characteristics to total and organic mercury concentrations to determine whether accumulation is influenced by trophic level, Hg concentration in the diet, and vertical distribution. Levels of total mercury and methylmercury were determined in the muscle tissue of eight species of fish: Pagellus acarne, Trachurus picturatus, Phycis phycis, P. blennoides, Polyprion americanus, Conger conger, Lepidopus caudatus and Mora moro, caught in the Azores. All such fishes are commercially valuable and were selected to include species from a wide range of vertical distributions from epipelagic (<200 m) to mesopelagic (>300 m) environments. Methylmercury was the major form accumulated in all species, comprising an average of 88.1% of total mercury. Concentrations of mercury (total and methylmercury) increased with age, length and weight. Based on data from other studies, mercury concentrations in fish diet were estimated. Mercury levels in food ranged from 0.08 to 0.32 ppm, dry weight. Hg concentrations in the food and in muscle tissue from different species were positively correlated. Total Hg levels in the muscles were approximately nine times those estimated in food. Total mercury concentrations in muscle were positively correlated with both trophic level and median depth. Such enhanced mercury bioaccumulation in relation to depth appears to be determined primarily by concentrations in food and ultimately by water chemistry, which controls mercury speciation and uptake at the base of the food chain.
Authors:
Maria C Magalhães; Valentina Costa; Gui M Menezes; Mário R Pinho; Ricardo S Santos; Luís R Monteiro
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-08-28
Journal Detail:
Title:  Marine pollution bulletin     Volume:  54     ISSN:  0025-326X     ISO Abbreviation:  Mar. Pollut. Bull.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-10-01     Completed Date:  2007-12-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0260231     Medline TA:  Mar Pollut Bull     Country:  England    
Other Details:
Languages:  eng     Pagination:  1654-62     Citation Subset:  IM    
Affiliation:
Department of Oceanography and Fisheries, University of Azores, 9901-862 Horta, Portugal. mcarvalho@notes.horta.uac.pt
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Atlantic Ocean
Azores
Body Size
Environmental Monitoring*
Fishes / metabolism*
Food Chain
Food Contamination
Mercury / analysis,  pharmacokinetics*
Methylmercury Compounds / analysis,  pharmacokinetics*
Models, Statistical
Muscles / chemistry
Portugal
Regression Analysis
Species Specificity
Water Pollutants, Chemical / analysis,  pharmacokinetics*
Chemical
Reg. No./Substance:
0/Methylmercury Compounds; 0/Water Pollutants, Chemical; 7439-97-6/Mercury

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


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