Menu

Herbicide May Harm Microbiome of Bees

Glyphosate perturbs the balance of gut bacteria in honey bees and increases the insects’ susceptibility to lethal infection.

Sep 26, 2018
Iris Kulbatski

ABOVE: Studying the gut microbiome of bees provides insight into the insects' overall health and resistance to infection.
PIXABAY, POLLYDOT

Consuming a mixture of sugar syrup and glyphosate, the active ingredient in Monsanto’s Roundup herbicide, alters honey bees’ microbiomes, and these changes increased mortality among insects exposed to pathogenic bacteria, according to a study published yesterday (September 24) in PNAS

Glyphosate is the most commonly used herbicide worldwide. It acts by blocking a key plant enzyme used in the production of amino acids. Researchers are divided on whether the chemical is safe to animals at the levels it is usually used as a herbicide. However, some bacteria are known to produce this enzyme, and the new study demonstrates what some researchers have suspected: glyphosate may harm animals indirectly by killing their resident microbes. 

Nancy Moran of the University of Texas at Austin and colleagues found that glyphosate consumption can lower the levels of the common bee symbiont Snodgrassella alvi by up to five times in the guts of honey bees, and high levels of the herbicide thwarted growth of S. alvi in vitro. Moreover, bees were more susceptible to infection by Serratia marcescens, a bacterium commonly present at low levels in beehives, after drinking the glyphosate–sugar water cocktail: only 12 percent of the insects survived, compared with 47 percent of infected bees that had not been fed glyphosate. 

Given these findings, more research is warranted to determine whether the proposed mechanism of honey bee morbidity contributes significantly to issues of colony collapse and overall rates of honey bee decline worldwide, University of Illinois bee geneticist Gene Robinson tells Science

Moreover, the current study raises the possibility that glyphosate may alter the gut microbiome of other animals, including humans, Moran tells Science.

October 2018

Bright Lights, Big Problems

Scientists are exploring the ecological damage caused by artificially lit night skies

Marketplace

Sponsored Product Updates

Reliable Collection of High-Quality Fecal Samples for Gut Microbiome Studies

Reliable Collection of High-Quality Fecal Samples for Gut Microbiome Studies

Check out this white paper from DNA Genotek to see how OMNIgene•GUT allows for reliable and reproducible self-collection of fecal samples.

Can Saliva Replace Blood for DNA Collection and Analysis?

Can Saliva Replace Blood for DNA Collection and Analysis?

Check out this white paper from DNA Genotek to examine why saliva is a viable alternative to blood draws for obtaining DNA samples.

Neural Cell Culturing Guide

Neural Cell Culturing Guide

Download this guide from R&D Systems to learn the fundamental techniques and protocols for successfully isolating, culturing, and expanding specific cell types from the rodent central and peripheral nervous systems!

Immunophenotyping Extracellular Vesicles Using Amnis® Technology

Immunophenotyping Extracellular Vesicles Using Amnis® Technology

Download this application note to learn how the Amnis® time delay integration (TDI) image capturing system facilitates high-throughput flow cytometry with high sensitivity to submicron particles!