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What if the very GM agricultural system that Monsanto claims will help to solve the problem of world hunger depends on a chemical that kills the very pollinator upon which approximately 70% of world's food supply now depends?
A new study published in the Journal of Experimental Biology titled, "Effects of field-realistic doses of glyphosate on honeybee appetitive behavior," establishes a link between the world's most popular herbicide – aka Roundup – and the dramatic decline in honeybee (Apis mellifera) populations in North American and Europe that lead to the coining of the term 'colony collapse disorder' (CCD) in late 2006 to describe the phenomena.
The researchers found that concentrations of glyphosate (GLY) consistent with the type of exposures associated with standard spraying practices in GM agricultural- and neighboring eco- systems reduced the honeybee's sensitivity to nectar reward and impaired their learning abilities – two behavioral consequences likely to adversely affect their survival abilities. Moreover, while sub-lethal doses were not found to overtly affect their foraging behavior, they hypothesized that because of their resilience, "..forager bees could become a source of constant inflow of nectar with GLY traces that could then be distributed among nest mates, stored in the hive and have long- term negative consequences on colony performance."
A Deeper Look at the New Study: Roundup Interferes with Bee Appetite and Learning
Roundup herbicide is a ubiquitous toxicant, with an accumulating body of research now showing it is a common contaminant in our air, water, rain, soil and food, and in physiologically relevant concentrations (even the part-per-trillion concentration range demonstrates endocrine disruptive and potentially carcinogenic properties) to microbial, insect, animal and human life.
When Roundup herbicide was first evaluated for toxicity to the honeybee, the focus was on acute toxicity of the 'active ingredient' and not sub-lethal and prolonged exposure effects; and certainly not the amplified toxicological synergies present in glyphosate formulations like Roundup, which when the so-called 'inert' adjuvant ingredients (e.g. surfactants) are taken into account, have been found to be at least 125 times more toxic than glyphosate alone. By only taking into account acute toxicity – as measured by the so-called LD50 (lethal dose, 50%) – on the 'active' ingredient, government regulators approved glyphosate as relatively harmless to honeybees prematurely.
The researchers expanded on the topic:
"Glyphosate [GLY] toxicity tests on Apis mellifera for product approval did not consider sub-lethal nor prolonged exposure effects. Studies were only focused on obtaining LD50 (lethal dose, 50%) as a measure of the effect of an acute exposure, but nevertheless, they were carried out on the basis that honeybees might in fact be exposed to GLY in their natural environment, either through the consumption of contaminated resources or through a direct exposure as a result of inadvertent spraying (Giesy et al., 2000). Even though LD50 results seem to indicate that GLY is not harmful for honeybees, the fact that honeybees are potentially exposed to GLY motivated us to pursue further analysis and to address the lack of chronic studies."
The authors of the new study set out to test whether doses of glyphosate bees would realistically encounter in the field (field-realistic doses) could affect their feeding behavior (appetitive behavior) in a deleterious manner.
They exposed honeybees to field-realistic doses of glyphosate chronically and acutely, and observed: "a reduced sensitivity to sucrose and learning performance for the groups chronically exposed to GLY concentrations within the range of recommended doses," as well as significant decrease in elemental learning, non-elemental associative learning, and short-term memory retention, when exposed to acute GLY doses.
Roundup Already Identified As Likely Cause of Colony Collapse Disorder
This latest study is not the first to link glyphosate to the vanishing honeybee.
Extensive research on the topic performed by Dr. Don D. Huber and summarized in an article published last year titled, "Is glyphosate a contributing cause of bee colony collapse disorder (CCD)?," lead him to conclude that the 880 million pounds of glyphosate released into the environment worldwide has been contributing to the collapse of the honeybee. The paper revealed the following six ways that glyphosate could contribute to CCD: