Evaluating mercury biomagnification in fish from a tropical marine environment using stable isotopes (δ13C and δ15N)

Hassan A. Al-Reasi, Fuad A. Ababneh, David R. Lean

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

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 (δ13C and δ15N) 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 (Δδ13C) between zooplankton and planktivorous fish (Selar crumenopthalmus, Rastrelliger kanagurta, and S. longiceps) was higher (3.4‰) 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 δ15N and and slopes of the regression equations (log10[T-Hg] = 0.13[δ15N] - 3.57 and log 10[MeHg] = 0.14[δ15N] - 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.

Original languageEnglish
Pages (from-to)1572-1581
Number of pages10
JournalEnvironmental Toxicology and Chemistry
Volume26
Issue number8
DOIs
Publication statusPublished - Aug 2007

Fingerprint

tropical environment
Mercury
Zooplankton
Isotopes
Fish
marine environment
Fishes
stable isotope
zooplankton
fish
Oman
methylmercury
Nutrition
Oceans and Seas
diet
Diet
No-Observed-Adverse-Effect Level
Food Chain
World Health Organization
Lakes

Keywords

  • Fish
  • Gulf of Oman
  • Methylmercury
  • Total mercury
  • Trophic positions

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Toxicology
  • Health, Toxicology and Mutagenesis

Cite this

Evaluating mercury biomagnification in fish from a tropical marine environment using stable isotopes (δ13C and δ15N). / Al-Reasi, Hassan A.; Ababneh, Fuad A.; Lean, David R.

In: Environmental Toxicology and Chemistry, Vol. 26, No. 8, 08.2007, p. 1572-1581.

Research output: Contribution to journalArticle

@article{39db71eca4d540299b5ae15df356f8c0,
title = "Evaluating mercury biomagnification in fish from a tropical marine environment using stable isotopes (δ13C and δ15N)",
abstract = "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 (δ13C and δ15N) 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 (Δδ13C) between zooplankton and planktivorous fish (Selar crumenopthalmus, Rastrelliger kanagurta, and S. longiceps) was higher (3.4‰) 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 δ15N and and slopes of the regression equations (log10[T-Hg] = 0.13[δ15N] - 3.57 and log 10[MeHg] = 0.14[δ15N] - 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.",
keywords = "Fish, Gulf of Oman, Methylmercury, Total mercury, Trophic positions",
author = "Al-Reasi, {Hassan A.} and Ababneh, {Fuad A.} and Lean, {David R.}",
year = "2007",
month = "8",
doi = "10.1897/06-359R.1",
language = "English",
volume = "26",
pages = "1572--1581",
journal = "Environmental Toxicology and Chemistry",
issn = "0730-7268",
publisher = "John Wiley and Sons Ltd",
number = "8",

}

TY - JOUR

T1 - Evaluating mercury biomagnification in fish from a tropical marine environment using stable isotopes (δ13C and δ15N)

AU - Al-Reasi, Hassan A.

AU - Ababneh, Fuad A.

AU - Lean, David R.

PY - 2007/8

Y1 - 2007/8

N2 - 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 (δ13C and δ15N) 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 (Δδ13C) between zooplankton and planktivorous fish (Selar crumenopthalmus, Rastrelliger kanagurta, and S. longiceps) was higher (3.4‰) 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 δ15N and and slopes of the regression equations (log10[T-Hg] = 0.13[δ15N] - 3.57 and log 10[MeHg] = 0.14[δ15N] - 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.

AB - 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 (δ13C and δ15N) 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 (Δδ13C) between zooplankton and planktivorous fish (Selar crumenopthalmus, Rastrelliger kanagurta, and S. longiceps) was higher (3.4‰) 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 δ15N and and slopes of the regression equations (log10[T-Hg] = 0.13[δ15N] - 3.57 and log 10[MeHg] = 0.14[δ15N] - 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.

KW - Fish

KW - Gulf of Oman

KW - Methylmercury

KW - Total mercury

KW - Trophic positions

UR - http://www.scopus.com/inward/record.url?scp=34547936548&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547936548&partnerID=8YFLogxK

U2 - 10.1897/06-359R.1

DO - 10.1897/06-359R.1

M3 - Article

VL - 26

SP - 1572

EP - 1581

JO - Environmental Toxicology and Chemistry

JF - Environmental Toxicology and Chemistry

SN - 0730-7268

IS - 8

ER -