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Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
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Normalizing the Biomagnification Factor.

Frank A P C Gobas1, Yung-Shan Lee1, Jon A Arnot2,3,4

  • 1School of Resource and Environmental Management, Simon Fraser University, Burnaby, British Columbia, Canada.

Environmental Toxicology and Chemistry
|December 8, 2020
PubMed
Summary
This summary is machine-generated.

Normalizing biomagnification factors (BMF) to fish lipid content may underestimate chemical risks. Accurately assessing biomagnification requires considering both fish and dietary lipid content for lipophilic substances.

Keywords:
AssessmentBioaccumulationBioconcentrationBiomagnificationLipid

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Area of Science:

  • Environmental Toxicology
  • Ecotoxicology
  • Chemical Risk Assessment

Background:

  • Biomagnification Factor (BMF) is crucial for assessing chemical transfer in food webs.
  • Normalization of BMF to fish lipid content is a recent proposal.
  • Lipophilic chemicals' biomagnification is influenced by diet and organismal lipid content.

Purpose of the Study:

  • To evaluate the proposed normalization of the biomagnification factor (BMF) to a 5% lipid content in fish.
  • To investigate the impact of dietary and fish lipid content on the BMF of lipophilic chemicals.
  • To compare the proposed normalization method with established metrics for assessing biomagnification potential.

Main Methods:

  • Utilized theoretical models and experimental data.
  • Analyzed the relationship between BMF, lipophilic chemicals, and lipid content in fish and diet.
  • Compared BMF normalization to 5% fish lipid content with normalization to both fish and dietary lipid content.

Main Results:

  • BMF of lipophilic chemicals is a function of dietary lipid content.
  • Poorly metabolizable lipophilic chemicals biomagnify more in higher-lipid diets.
  • Normalization to 5% fish lipid content can underestimate biomagnification potential.
  • Normalization accounting for both fish and dietary lipid content better reflects real-world biomagnification.

Conclusions:

  • The proposed normalization of BMF to 5% fish lipid content may underestimate the biomagnification of lipophilic substances.
  • A BMF metric that accounts for both fish and dietary lipid content, as in OECD guideline 305, provides a more accurate assessment of real-world biomagnification.
  • Accurate assessment of chemical risks in aquatic food webs necessitates considering lipid content in both organisms and diet.