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    
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.
Hassan A Al-Reasi; Fuad A Ababneh; David R Lean
Related Documents :
12663198 - Effects of intensive fishing on the structure of zooplankton communities and mercury le...
3693798 - Deionization of formamide with biorad ag501-x(d).
11843528 - Contaminant residues in seabird eggs from the canadian arctic. ii. spatial trends and e...
11904388 - Algal blooms reduce the uptake of toxic methylmercury in freshwater food webs.
19650958 - Are snacking patterns associated with risk of overweight among kahnawake schoolchildren?
15054288 - Measurement of rheology of distiller's grain slurries using a helical impeller viscometer.
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    
Department of Biology, University of Ottawa, Ottawa, Ontario, Canada.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Carbon Isotopes / analysis,  chemistry
Environmental Monitoring*
Fishes / metabolism*
Food Chain
Mercury / analysis,  metabolism*,  toxicity
Methylmercury Compounds / analysis,  metabolism*,  toxicity
Nitrogen Isotopes / analysis,  chemistry
Species Specificity
Time Factors
Tropical Climate
Water Pollutants, Chemical / analysis,  metabolism*,  toxicity
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

Previous Document:  Analysis of glutathione endpoints for measuring copper stress in Chlamydomonas reinhardtii.
Next Document:  Accumulation and transfer of contaminants in killer whales (Orcinus orca) from Norway: indications f...