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Quantification of the Potential Impact of Glyphosate-Based Products on Microbiomes
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Glyphosate persistence in seawater.

Philip Mercurio1, Florita Flores2, Jochen F Mueller3

  • 1The University of Queensland, National Research Centre for Environmental Toxicology, 39 Kessels Road, Coopers Plains, Brisbane, QLD 4108, Australia; Australian Institute of Marine Science, PMB No. 3, Townsville, QLD 4810, Australia.

Marine Pollution Bulletin
|January 29, 2014
PubMed
Summary

Glyphosate, a common herbicide, persists longer in tropical marine environments than previously known. This study reveals extended half-lives in dark, warm seawater, raising concerns for coastal ecosystems.

Keywords:
DegradationGlyphosateMicrobialPersistenceSeawaterTropical

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Area of Science:

  • Environmental Science
  • Marine Biology
  • Ecotoxicology

Background:

  • Glyphosate is a widely used herbicide with unknown persistence in marine environments.
  • Understanding herbicide fate in coastal waters is crucial for ecosystem health.

Purpose of the Study:

  • To quantify the biodegradation and persistence of glyphosate in Great Barrier Reef coastal seawater.
  • To assess the impact of light and temperature on glyphosate degradation rates.

Main Methods:

  • Standard simulation flask tests were employed.
  • Native bacterial populations and coastal seawater from the Great Barrier Reef were used.
  • Glyphosate and its transformation product AMPA were monitored under varying light and temperature conditions.

Main Results:

  • Glyphosate half-life ranged from 47 days (low-light, 25°C) to 315 days (dark, 31°C).
  • AMPA, a microbial transformation product, was detected, confirming biodegradation by native microbes.
  • Glyphosate exhibited moderate persistence in low light and high persistence in the dark.

Conclusions:

  • Glyphosate is moderately to highly persistent in tropical marine waters, particularly in the dark.
  • Limited degradation in tropical flood plumes could lead to widespread offshore transport of glyphosate.
  • Findings highlight potential risks to marine ecosystems from agricultural runoff.