Document Detail


Evaluating mercury biomagnification in fish from a tropical marine environment using stable isotopes (delta13C and delta15N).
MedLine Citation:
PMID:  17702328     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Concentrations of total mercury (T-Hg) and methylmercury (MeHg) were measured in zooplankton and 13 fish species from a coastal food web of the Gulf of Oman, an arm of the Arabian Sea between Oman and Iran. Stable isotope ratios (delta13C and delta15N) also were determined to track mercury biomagnification. The average concentration of T-Hg in zooplankton was 21 +/- 8.0 ng g(-1) with MeHg accounting 10% of T-Hg. Total mercury levels in fish species ranged from 3.0 ng g(-1) (Sardinella longiceps) to 760 ng g(-1) (Rhizoprionodon acutus) with relatively lower fraction of MeHg (72%) than that found in other studies. The average trophic difference (Deltadelta13C) between zooplankton and planktivorous fish (Selar crumenopthalmus, Rastrelliger kanagurta, and S. longiceps) was higher (3.4 per thousandth) than expected, suggesting that zooplankton may not be the main diet or direct carbon source for these fish species. However, further sampling would be required to compensate for temporal changes in zooplankton and the influence of their lipid content. Trophic position inferred by delta15N and and slopes of the regression equations (log10[T-Hg] = 0.13[delta15N] - 3.57 and log10[MeHg] = 0.14[delta15N] - 3.90) as estimates of biomagnification indicate that biomagnification of T-Hg and MeHg was lower in this tropical ocean compared to what has been observed in arctic and temperate ecosystems and tropical African lakes. The calculated daily intake of methylmercury in the diet of local people through fish consumption was well below the established World Health Organization (WHO) tolerable daily intake threshold for most of the fish species except Euthynnus affinis, Epinephelus epistictus, R. acutus, and Thunnus tonggol, illustrating safe consumption of the commonly consumed fish species.
Authors:
Hassan A Al-Reasi; Fuad A Ababneh; David R Lean
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Publication Detail:
Type:  Evaluation Studies; Journal Article    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  26     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-08-17     Completed Date:  2007-10-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1572-81     Citation Subset:  IM    
Affiliation:
Department of Biology, University of Ottawa, Ottawa, Ontario, Canada. alreasi@squ.edu.com
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MeSH Terms
Descriptor/Qualifier:
Animals
Carbon Isotopes / analysis,  chemistry
Environmental Monitoring*
Fishes / metabolism*
Food Chain
Iran
Mercury / analysis,  metabolism*,  toxicity
Methylmercury Compounds / analysis,  metabolism*,  toxicity
Nitrogen Isotopes / analysis,  chemistry
Oman
Seawater
Species Specificity
Time Factors
Tropical Climate
Water Pollutants, Chemical / analysis,  metabolism*,  toxicity
Chemical
Reg. No./Substance:
0/Carbon Isotopes; 0/Methylmercury Compounds; 0/Nitrogen Isotopes; 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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